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Publications IGN 2023
- Assuring the quality of VGI on land use and land cover: experiences and learnings from the LandSense project [Article/Communication] / Giles M. Foody, Auteur ; Gavin Long, Auteur ; Michael Schultz, Auteur ; Ana-Maria Olteanu-Raimond, Auteur . - 2023 . - n° 2100285.bibliographieLangues : Anglais (eng)in Geo-spatial Information Science > vol 26 n° inconnu [01/08/2023] . - n° 2100285
Descripteur : [Vedettes matières IGN] Bases de données localisées[Termes IGN] assurance qualité[Termes IGN] données localisées des bénévoles[Termes IGN] occupation du sol[Termes IGN] qualité des données[Termes IGN] utilisation du sol Résumé : (auteur) The potential of citizens as a source of geographical information has been recognized for many years. Such activity has grown recently due to the proliferation of inexpensive location aware devices and an ability to share data over the internet. Recently, a series of major projects, often cast as citizen observatories, have helped explore and develop this potential for a wide range of applications. Here, some of the experiences and learnings gained from part of one such project, which aimed to further the role of citizen science within Earth observation and help address environmental challenges, LandSense, are shared. The key focus is on quality assurance of citizen generated data on land use and land cover especially to support analyses of remotely sensed data and products. Particular focus is directed to quality assurance checks on photographic image quality, privacy, polygon overlap, positional accuracy and offset, contributor agreement, and categorical accuracy. The discussion aims to provide good practice advice to aid future studies and help fulfil the full potential of citizens as a source of volunteered geographical information (VGI). Numéro de notice : A2023-081 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10095020.2022.2100285 Date de publication en ligne : 21/07/2022 En ligne : https://doi.org/10.1080/10095020.2022.2100285 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101337 The DORIS network: Advances achieved in the last fifteen years
The DORIS network: Advances achieved in the last fifteen years [Article/Communication] / Jérôme Saunier, Auteur . - 2023.bibliographieLangues : Anglais (eng)in Advances in space research > vol inconnu (2023)Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux[Termes IGN] DORIS Résumé : (auteur) The Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) system is based on a homogeneous global geodetic network. The DORIS ground network is managed and monitored by a core group (CNES & IGN), which made it possible to closely steer its deployment and evolution. Thanks to infrastructure and hardware enhancements, the DORIS network has continuously improved over time in order to meet the performance requirements of satellite altimetry but also strengthen its role as geodetic network to contribute to the International Terrestrial Reference Frame (ITRF). Following the review by Fagard (2006) of the network from its initial deployment to its renovation, this paper aims at showing the advances achieved in the last fifteen years (2006–2021) to better serve the needs for precise orbit determination and geodesy. After reminding the historical background and the different stages of the network development, we zoom in the last decade that enabled the network to achieve improved operability thanks to infrastructure standardization, permanent monitoring and ongoing assessment. Today, the numerous strengths and assets of the DORIS network built up over 30 years give it an important role in contributing to Earth Sciences. This review shows the progress achieved in terms of geographical coverage, co-location with other techniques, data availability, stations equipment, monument stability, and system requirements compliance. Finally, we give an overview of the future prospects and new challenges to continue improvements in the DORIS technique. Numéro de notice : A2023-082 Affiliation des auteurs : IGN (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2022.07.016 En ligne : https://doi.org/10.1016/j.asr.2022.07.016 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101340 The international DORIS service contribution to ITRF2020
The international DORIS service contribution to ITRF2020 [Article/Communication] / Guilhem Moreaux, Auteur ; Franck G. Lemoine, Auteur ; Hugues Capdeville, Auteur ; Michiel Otten, Auteur ; Petr Štěpánek, Auteur ; Jérôme Saunier, Auteur ; Pascale Ferrage, Auteur . - 2023.Langues : Anglais (eng)in Advances in space research > vol inconnu (2023)Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux[Termes IGN] combinaison au niveau des observations[Termes IGN] DORIS[Termes IGN] International Terrestrial Reference Frame[Termes IGN] mouvement du pôle Résumé : (autuer) For the realization of the 2020 International Terrestrial Reference Frame (ITRF2020), the International DORIS Service delivered to the International Earth Rotation and Reference Systems Service (IERS) a set of 1456 weekly solution files from 1993.0 to 2021.0 including station coordinates and Earth orientation parameters (EOPs). The data come from fourteen DORIS satellites: TOPEX/Poseidon, SPOT-2, SPOT-3, SPOT-4, SPOT-5, Envisat, Jason-1, Jason-2, Cryosat-2, Saral, HY-2A, Jason-3, Sentinel-3A and Sentinel-3B. In their processing, the four analysis centers which contributed to the DORIS combined solution used the latest time variable gravity models, the new mean pole and diurnal-subdiurnal tidal EOP models recommended by IERS. In addition, all the analysis centers included in their processing precise SPOT-5 solar panel angle values and quaternions for, at least, the Jason satellites. Furthermore, a new Alcatel phase center variation model was implemented for the ITRF2020 processing. The main objective of this study is to present the combination process and to analyze the impact of the new modeling on the performance of the new combined solution. Comparisons with the IDS contribution to ITRF2014 show that i) the application of the new phase center variations for the Alcatel DORIS ground antennas in the data processing combined with the gradual replacement over time of the Alcatel by Starec antennas implies a scale drift from 1993.0 to 2002.5 and ii) thanks to a better modeling of the surface forces on the satellites, the new combined solution shows smaller annual and 118-day signals in the geocenter. A new DORIS terrestrial reference frame was computed to evaluate the intrinsic quality of the new combined solution. That evaluation shows that over almost the full time span the intrinsic IDS scale values lie in a range of mm. After mid-2008, the new DORIS reference frame has an internal position consistency in North-East-Up better than 7.5 mm. Numéro de notice : A2023-083 Affiliation des auteurs : IGN+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2022.07.012 Date de publication en ligne : 15/07/2022 En ligne : https://doi.org/10.1016/j.asr.2022.07.012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101349 - Observations on the biology of Lachnaia cylindrica (Lacordaire, 1848), with description of the egg and the first instar larva (Coleoptera, Chrysomelidae, Cryptocephalinae) [Article/Communication] / Maxime Bellifa, Auteur . - 2023 . - pp 173 - 184.bibliographieLangues : Français (fre) Anglais (eng)in Bulletin de la Société entomologique de France > vol 128 n° 2 [19/06/2023] . - pp 173 - 184
Résumé : (auteur) During spring 2022‚ numerous observations of Lachnaia cylindrica (Lacordaire‚ 1848) have been made by the author‚ providing clarification on the biology of the species. For the first time‚ adults have been observed breeding on Pinus halepensis Mill.‚ 1768. Mating‚ egg-laying behaviour and first instar larva have been observed and are described. A comparison with data available on other Lachnaia species‚ as well as other species in the tribe Clytrini‚ is made. The egg of Lachnaia paradoxa (Olivier‚ 1808) is also described for the first time. Numéro de notice : A2023- Affiliation des auteurs : IGN (2020- ) Nature : Article DOI : 10.32475/bsef_2264 Date de publication en ligne : 19/06/2023 En ligne : https://doi.org/10.32475/bsef_2264 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103364 - FORMS: Forest Multiple Source height, wood volume, and biomass maps in France at 10 to 30 m resolution based on Sentinel-1, Sentinel-2, and GEDI data with a deep learning approach [Article/Communication] / Martin Schwartz, Auteur ; Philippe Ciais, Auteur ; Aurélien de Truchis, Auteur ; Jérôme Chave, Auteur ; Catherine Ottle, Auteur ; Cédric Vega, Auteur ; Jean-Pierre Wigneron, Auteur ; et al., Auteur . - 2023.bibliographieLangues : Anglais (eng)in Earth System Science Data > vol 15 n° inconnu (2023)
Descripteur : [Termes IGN] apprentissage profond[Termes IGN] biomasse aérienne[Termes IGN] données allométriques[Termes IGN] Global Ecosystem Dynamics Investigation lidar[Termes IGN] hauteur des arbres[Termes IGN] image Sentinel-MSI[Termes IGN] image Sentinel-SAR[Termes IGN] inventaire forestier national (données France)[Termes IGN] modèle numérique de surface de la canopée[Vedettes matières IGN] Inventaire forestier Résumé : (auteur) The contribution of forests to carbon storage and biodiversity conservation highlights the need for accurate forest height and biomass mapping and monitoring. In France, forests are managed mainly by private owners and divided into small stands, requiring 10 to 50 m spatial resolution data to be correctly separated. Further, 35 % of the French forest territory is covered by mountains and Mediterranean forests which are managed very extensively. In this work, we used a deep-learning model based on multi-stream remote sensing measurements (NASA’s GEDI LiDAR mission and ESA’s Copernicus Sentinel 1 & 2 satellites) to create a 10 m resolution canopy height map of France for 2020 (FORMS-H). In a second step, with allometric equations fitted to the French National Forest Inventory (NFI) plot data, we created a 30 m resolution above-ground biomass density (AGBD) map (Mg ha-1) of France (FORMS-B). Extensive validation was conducted. First, independent datasets from Airborne Laser Scanning (ALS) and NFI data from thousands of plots reveal a mean absolute error (MAE) of 2.94 m for FORMS-H, which outperforms existing canopy height models. Second, FORMS-B was validated using two independent forest inventory datasets from the Renecofor permanent forest plot network and from the GLORIE forest inventory with MAE of 59.6 Mg ha-1 and 19.6 Mg.ha-1 respectively, providing greater performance than other AGBD products sampled over France. These results highlight the importance of coupling remote sensing technologies with recent advances in computer science to bring material insights to climate-efficient forest management policies. Additionally, our approach is based on open-access data having global coverage and a high spatial and temporal resolution, making the maps reproducible and easily scalable. FORMS products can be accessed from https://doi.org/10.5281/zenodo.7840108 (Schwartz et al., 2023). Numéro de notice : A2023-179 Affiliation des auteurs : LIF+Ext (2020- ) Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/essd-2023-196 En ligne : https://doi.org/10.5194/essd-2023-196 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103341 Data-driven gap filling and spatio-temporal filtering of the GRACE and GRACE-FO records
Data-driven gap filling and spatio-temporal filtering of the GRACE and GRACE-FO records [Article/Communication] / Louis-Marie Gauer, Auteur ; Kristel Chanard, Auteur ; Luce Fleitout, Auteur . - 2023 . - n° e2022JB025561.bibliographie This study was supported by the CNES-TOSCA HYDROGEODESY project.Langues : Anglais (eng)in Journal of geophysical research : Solid Earth > vol 128 n° 5 (May 2023) . - n° e2022JB025561Descripteur : [Vedettes matières IGN] Géodésie physique[Termes IGN] données GRACE[Termes IGN] filtrage spatiotemporel[Termes IGN] traitement de données localisées[Termes IGN] valeur aberrante Résumé : (auteur) Gravity Recovery And Climate Experiment and Follow On (GRACE/-FO) global monthly measurements of Earth's gravity field have led to significant advances in quantifying mass transfer. However, a significant temporal gap between missions hinders evaluating long-term mass variations. Moreover, instrumental and processing errors translate into large non-physical North-South stripes polluting geophysical signals. We use Multichannel Singular Spectrum Analysis (M-SSA) to overcome both issues by exploiting spatio-temporal information of Level-2 GRACE/-FO solutions, filtered using the DDK7 decorrelation and a new complementary filter, built based on the residual noise between fully processed data and a parametric fit to observations. Using an iterative M-SSA on Equivalent Water Height (EWH) time series processed by Center of Space Research, GeoForschungsZentrum, Institute of Geodesy at Graz University of Technology, and Jet Propulsion Laboratory, we replace missing data and outliers to obtain a combined evenly sampled solution. Then, we apply M-SSA to retrieve common signals between each EWH time series and its same-latitude neighbors to further reduce residual spatially uncorrelated noise. Comparing GRACE/-FO M-SSA solution with Satellite Laser Ranging and Swarm low-degree Earth's gravity field and hydrological model demonstrates its ability to satisfyingly fill missing observations. Our solution achieves a noise level comparable to mass concentration (mascon) solutions over oceans (3.0 mm EWH), without requiring a priori information nor regularization. While short-wavelength signals are challenging to capture using highly filtered spherical harmonics or mascons solutions, we show that our technique efficiently recovers localized mass variations using well-documented mass transfers associated with reservoir impoundments. Numéro de notice : A2023-096 Affiliation des auteurs : UMR IPGP-Géod (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2022JB025561 En ligne : https://doi.org/10.1029/2022JB025561 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103213 Detrending climate data prior to climate–growth analyses in dendroecology: a common best practice?
Detrending climate data prior to climate–growth analyses in dendroecology: a common best practice? [Article/Communication] / Clémentine Ols, Auteur ; Stefan Klesse, Auteur ; Martin P. Girardin, Auteur ; Margaret E.K. Evans, Auteur ; R. Justin DeRose, Auteur ; Valérie Trouet, Auteur . - 2023 . - n° 126094.bibliographieLangues : Anglais (eng)in Dendrochronologia > vol inconnu (2023) . - n° 126094Descripteur : [Termes IGN] cerne[Termes IGN] changement climatique[Termes IGN] croissance végétale[Termes IGN] dendrochronologie[Termes IGN] série temporelle[Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) Tree growth varies closely with high–frequency climate variability. Since the 1930s detrending climate data prior to comparing them with tree growth data has been shown to better capture tree growth sensitivity to climate. However, in a context of increasingly pronounced trends in climate, this practice remains surprisingly rare in dendroecology. In a review of Dendrochronologia over the 2018-2021 period, we found that less than 20% of dendroecological studies detrended climate data prior to climate-growth analyses. With an illustrative study, we want to remind the dendroecology community that such a procedure is still, if not more than ever, rational and relevant. We investigated the effects of detrending climate data on climate–growth relationships across North America over the 1951–2000 period. We used a network of 2,536 tree individual ring-width series from the Canadian and Western US forest inventories. We compared correlations between tree growth and seasonal climate data (Tmin, Tmax, Prec) both raw and detrended. Detrending approaches included a linear regression, 30-yr and 100-yr cubic smoothing splines. Our results indicate that on average the detrending of climate data increased climate–growth correlations. In addition, we observed that strong trends in climate data translated to higher variability in inferred correlations based on raw vs. detrended climate data. We provide further evidence that our results hold true for the entire spectrum of dendroecological studies using either mean site chronologies and correlations coefficients, or individual tree time series within a mixed-effects model framework where regression coefficients are used more commonly. We show that even without a change in correlation, regression coefficients can change a lot and we tend to underestimate the true climate impact on growth in case of climate variables containing trends. This study demonstrates that treating climate and tree-ring time series “like-for-like” is a necessary procedure to reduce false negatives and positives in dendroecological studies. Concluding, we recommend using the same detrending for climate and tree growth data when tree-ring time series are detrended with splines or similar frequency-based filters. Numéro de notice : A2023-092 Affiliation des auteurs : IGN+Ext (2020- ) Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.dendro.2023.126094 Date de publication en ligne : 05/05/2023 En ligne : https://doi.org/10.1016/j.dendro.2023.126094 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103182 Ensure forest-data integrity for climate change studies
Ensure forest-data integrity for climate change studies [Article/Communication] / Risto Päivinen, Auteur ; Rasmus Astrup, Auteur ; Richard A. Birdsey, Auteur ; Johannes Breidenbach, Auteur ; Jonas Fridman, Auteur ; Annika S. Kangas, Auteur ; Pekka E. Kauppi, Auteur ; Mickael Kohl, Auteur ; Kari T. Korhonen, Auteur ; Vivian Kvist Johannsen, Auteur ; François Morneau, Auteur ; Thomas Riedel, Auteur ; Klemens Schadauer, Auteur ; Iddo K. Wernick, Auteur . - 2023 . - pp 495 - 496.bibliographieLangues : Anglais (eng)in Nature climat change > vol 13 n° inconnu [01/05/2023] . - pp 495 - 496Descripteur : [Termes IGN] changement climatique[Termes IGN] intégrité des données[Vedettes matières IGN] Inventaire forestier Résumé : (auteur) Forest inventory observations are critical for monitoring the contribution of terrestrial ecosystems to the global carbon cycle and a changing climate1. Like all scientific data, ensuring open access to forest data generally serves to secure the integrity of the data and facilitate climt mitigation efforts. ... Numéro de notice : A2023-175 Affiliation des auteurs : IGN+Ext (2020- ) Thématique : BIODIVERSITE/FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1038/s41558-023-01683-8 Date de publication en ligne : 22/05/2023 En ligne : https://doi.org/10.1038/s41558-023-01683-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103294 - GRGS numerical simulations for a GRASP-like mission: A way to reach the GGOS goal for terrestrial reference frame [Article/Communication] / Arnaud Pollet, Auteur ; David Coulot, Auteur ; Richard Biancale, Auteur ; Felix Perozans, Auteur ; Sylvain Loyer, Auteur ; J.C. Marty, Auteur ; Susanne Glaser, Auteur ; Vladimir Schott-Guilmault, Auteur ; Jean-Michel Lemoine, Auteur ; Flavien Mercier, Auteur ; Samuel Nahmani, Auteur ; Mioara Mandea, Auteur . - 2023 . - n° 45.bibliographieLangues : Anglais (eng)in Journal of geodesy > vol 97 n° 5 (May 2023) . - n° 45
Descripteur : [Vedettes matières IGN] Géodésie spatiale[Termes IGN] International DORIS Service[Termes IGN] mission spatiale[Termes IGN] orbitographie[Termes IGN] positionnement par ITGB[Termes IGN] positionnement par télémétrie laser sur satellite[Termes IGN] repère de référence Résumé : (auteur) In 2009, the geoscience community has fixed an objective of 1 mm accuracy and 0.1 mm/yr stability for the terrestrial reference frame (TRF) realization (Global Geodetic Observing System, GGOS, Meeting the Requirements of a Global Society on a Changing Planet in 2020, Plag and Pearlman in Global geodetic observing system: meeting the requirements of a global society on a changing planet in 2020. Springer, Berlin, 2009. https://doi.org/10.1007/978-3-642-02687-4). This accuracy and stability are needed for diversified studies like climate change, tectonic sciences and more generally any geoscience requiring the use of an accurate and precise TRF. Unfortunately, they are still not reached by the last International Terrestrial Reference Frame. To reach this goal, the use of “multi-technique” satellites as “space-ties” has been studied since 2011 and a few proposals have been made in response to different space agency calls: the Geodetic Reference Antenna in Space (GRASP) mission—NASA Earth Venture 2 call, Eratosthenes-GRASP (E-GRASP)—ESA Earth Explorer 9 (EE9) call, MOBILE—ESA EE10 call, MARVEL—CNES Séminaire de Prospective Scientifique 2019). In this article, we present the numerical simulations carried out by the French Groupe de Recherche de Géodésie Spatiale (GRGS) for the E-GRASP proposal in response to the ESA EE-9 call and their improvements carried out afterwards. These simulations aim to answer three different questions: Is it possible to reach the GGOS requirements for the TRF with the measurements of a GRASP-like satellite like E-GRASP alone? If it is possible, which level of accuracy for the positioning of the on-board antennas is needed? What is the minimal lifetime of a E-GRASP mission to reach the GGOS requirements? The results of these simulations show that a E-GRASP satellite can allow us to reach, after five years, an accuracy close to 1 mm and a stability better than 0.1 mm/yr for the TRF. However, it is necessary to ensure a positioning better than 1 mm for the on-board antennas. We therefore encourage the new ESA GENESIS mission proposal, accepted during the ESA last Ministerial meeting on 23rd November 2022, which takes up the concept of a GRASP-type satellite. Numéro de notice : A2023-227 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-023-01730-4 Date de publication en ligne : 15/05/2023 En ligne : https://doi.org/10.1007/s00190-023-01730-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103247 ITRF2020: an augmented reference frame refining the modeling of nonlinear station motions
ITRF2020: an augmented reference frame refining the modeling of nonlinear station motions [Article/Communication] / Zuheir Altamimi, Auteur ; Paul Rebischung, Auteur ; Xavier Collilieux, Auteur ; Laurent Métivier, Auteur ; Kristel Chanard, Auteur . - 2023 . - n° 47.bibliographieLangues : Anglais (eng)in Journal of geodesy > vol 97 n° 5 (May 2023) . - n° 47Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux[Termes IGN] International Terrestrial Reference Frame Résumé : (auteur) To better describe the shape of the constantly deforming Earth’s surface, the ITRF2020 is provided as an augmented terrestrial reference frame that precisely models nonlinear station motions for both seasonal (annual and semi-annual) signals present in the station position time series and Post-Seismic Deformation (PSD) for sites impacted by major earthquakes. Reprocessed solutions in the form of station position time series and Earth Orientation Parameters using the full observation history provided by the four space geodetic techniques (DORIS, GNSS, SLR and VLBI) were used as input data, spanning 28, 27, 38 and 41 years of observations, respectively. The ITRF2020 long-term origin follows linearly with time the Earth’s Center of Mass (CM) as sensed by SLR, based on observations collected over the time span 1993.0–2021.0. We evaluate the accuracy of the ITRF2020 long-term origin position and time evolution by comparison to previous solutions, namely ITRF2014, ITRF2008 and ITRF2005, to be at the level of or better than 5 mm and 0.5 mm/yr, respectively. The ITRF2020 long-term scale is defined by a rigorous weighted average of selected VLBI sessions up to 2013.75 and SLR weekly solutions covering the 1997.75–2021.0 time span. For the first time of the ITRF history, the scale agreement between SLR and VLBI long-term solutions is at the level of 0.15 ppb (1 mm at the equator) at epoch 2015.0, with no drift. To accommodate most of ITRF2020 users, the seasonal station coordinate variations are provided in the CM as well as in the Center of Figure frames, together with a seasonal geocenter motion model. While the PSD parametric models were determined by fitting GNSS data only, they also fit the station position time series of the three other techniques that are colocated with GNSS, demonstrating their high performance in describing site post-seismic trajectories. Numéro de notice : A2023-098 Affiliation des auteurs : UMR IPGP-Géod (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-023-01738-w Date de publication en ligne : 19/05/2023 En ligne : https://doi.org/10.1007/s00190-023-01738-w Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103231 GeoDanceHive: An operational hive for honeybees dances recording
GeoDanceHive: An operational hive for honeybees dances recording [Article/Communication] / Sylvain Galopin, Auteur ; Guillaume Touya, Auteur ; Pierrick Aupinel, Auteur ; Freddie-Jeanne Richard, Auteur . - 2023 . - n° 1182.bibliographie This research was funded by the french ministries of Agriculture and Food Sovereignty (MASA—FCPR program), Ecological Transition and Territorial Cohesion (MTECT), Health and Prevention (MSP) and Higher Education and Research (MESR) and by the French national facility for institutional procurement of VHR satellite imagery (DINAMIS) and by the Lune de Miel® Fondation. This research was financially supported by the French Office for Biodiversity, on the fee envelope for diffuse pollution of the Écophyto II+ coord plan. F-J Richard, partners P. Aupinel and G. Touya for the DANCE project.Langues : Anglais (eng)in Animals > vol 13 n° 7 (April-1 2023) . - n° 1182Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] alimentation[Termes IGN] comportement[Termes IGN] enregistrement de données[Termes IGN] Hymenoptera (ordre) Résumé : (auteur) Honeybees are known for their ability to communicate about resources in their environment. They inform the other foragers by performing specific dance sequences according to the spatial characteristics of the resource. The purpose of our study is to provide a new tool for honeybees dances recording, usable in the field, in a practical and fully automated way, without condemning the harvest of honey. We designed and equipped an outdoor prototype of a production hive, later called “GeoDanceHive”, allowing the continuous recording of honeybees’ behavior such as dances and their analysis. The GeoDanceHive is divided into two sections, one for the colony and the other serving as a recording studio. The time record of dances can be set up from minutes to several months. To validate the encoding and sampling quality, we used an artificial feeder and visual decoding to generate maps with the vector endpoints deduced from the dance information. The use of the GeoDanceHive is designed for a wide range of users, who can meet different objectives, such as researchers or professional beekeepers. Thus, our hive is a powerful tool for honeybees studies in the field and could highly contribute to facilitating new research approaches and a better understanding landscape ecology of key pollinators. Numéro de notice : A2023-087 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ani13071182 En ligne : https://doi.org/10.3390/ani13071182 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102987 - A global long-term, high-resolution satellite radar backscatter data record (1992–2022+): merging C-band ERS/ASCAT and Ku-band QSCAT [Article/Communication] / Shengli Tao, Auteur ; Zurui Ao, Auteur ; Jean-Pierre Wigneron, Auteur ; Sassan Saatchi, Auteur ; Philippe Ciais, Auteur ; Jérôme Chave, Auteur ; Thuy Le Toan, Auteur ; Pierre-Louis Frison, Auteur ; et al., Auteur . - 2023 . - pp 1577 - 1596.bibliographie Data description paperLangues : Anglais (eng)in Earth System Science Data > vol 15 n° 4 (2023) . - pp 1577 - 1596
Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications[Termes IGN] bande C[Termes IGN] bande Ku[Termes IGN] fusion de données[Termes IGN] image radar moirée[Termes IGN] régression[Termes IGN] série temporelle Résumé : (auteur) Satellite radar backscatter contains unique information on land surface moisture, vegetation features, and surface roughness and has thus been used in a range of Earth science disciplines. However, there is no single global radar data set that has a relatively long wavelength and a decades-long time span. We here provide the first long-term (since 1992), high-resolution (∼8.9 km instead of the commonly used ∼25 km resolution) monthly satellite radar backscatter data set over global land areas, called the long-term, high-resolution scatterometer (LHScat) data set, by fusing signals from the European Remote Sensing satellite (ERS; 1992–2001; C-band; 5.3 GHz), Quick Scatterometer (QSCAT, 1999–2009; Ku-band; 13.4 GHz), and the Advanced SCATterometer (ASCAT; since 2007; C-band; 5.255 GHz). The 6-year data gap between C-band ERS and ASCAT was filled by modelling a substitute C-band signal during 1999–2009 from Ku-band QSCAT signals and climatic information. To this end, we first rescaled the signals from different sensors, pixel by pixel. We then corrected the monthly signal differences between the C-band and the scaled Ku-band signals by modelling the signal differences from climatic variables (i.e. monthly precipitation, skin temperature, and snow depth) using decision tree regression. The quality of the merged radar signal was assessed by computing the Pearson r, root mean square error (RMSE), and relative RMSE (rRMSE) between the C-band and the corrected Ku-band signals in the overlapping years (1999–2001 and 2007–2009). We obtained high Pearson r values and low RMSE values at both the regional (r≥0.92, RMSE ≤ 0.11 dB, and rRMSE ≤ 0.38) and pixel levels (median r across pixels ≥ 0.64, median RMSE ≤ 0.34 dB, and median rRMSE ≤ 0.88), suggesting high accuracy for the data-merging procedure. The merged radar signals were then validated against the European Space Agency (ESA) ERS-2 data, which provide observations for a subset of global pixels until 2011, even after the failure of on-board gyroscopes in 2001. We found highly concordant monthly dynamics between the merged radar signals and the ESA ERS-2 signals, with regional Pearson r values ranging from 0.79 to 0.98. These results showed that our merged radar data have a consistent C-band signal dynamic. The LHScat data set (https://doi.org/10.6084/m9.figshare.20407857; Tao et al., 2023) is expected to advance our understanding of the long-term changes in, e.g., global vegetation and soil moisture with a high spatial resolution. The data set will be updated on a regular basis to include the latest images acquired by ASCAT and to include even higher spatial and temporal resolutions. Numéro de notice : A2023-097 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/essd-15-1577-2023 Date de publication en ligne : 12/04/2023 En ligne : https://doi.org/10.5194/essd-15-1577-2023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103215 - Susceptibility of microseismic triggering to small sinusoidal stress perturbations at the laboratory scale [Article/Communication] / Martin Colledge, Auteur ; Jérôme Aubry, Auteur ; Kristel Chanard, Auteur ; François Pétrélis, Auteur ; Clara Duverger, Auteur ; Laurent Bollinger, Auteur ; Alexandre Schubnel, Auteur . - 2023 . - n° e2022JB025583.bibliographieLangues : Anglais (eng)in Journal of geophysical research : Solid Earth > vol 128 n° 4 (April 2023) . - n° e2022JB025583
Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale[Termes IGN] onde sismique[Termes IGN] oscillation[Termes IGN] risque naturel[Termes IGN] séisme[Termes IGN] sismicité Résumé : (auteur) Small transient stress perturbations are prone to trigger (micro)seismicity. In the Earth's crust, these stress perturbations can be caused by various sources such as the passage of seismic waves, forcing by tides, or hydrological seasonal loads. A better understanding of the dynamic of earthquake triggering by stress perturbations is essential to improve our understanding of earthquake physics and our consideration of seismic hazard. Here, we study an experimental sandstone-gouge-filled fault system undergoing combined far field loading and periodic stress perturbations (of variable amplitude and frequency) at crustal pressure conditions. Microseismicity—in the form of acoustic emissions (AEs)—strains, and stresses, are continuously recorded in order to study the response of microseismicity as a function of loading rate, amplitude, and frequency of a periodic stress perturbation. The observed AE distributions do not follow the predictions of either a Coulomb failure model, taking into account both constant loading and oscillation-induced strain rates, or a rate and state model. A susceptibility of the system's AE response to the amplitude of the confinement pressure perturbation is estimated, which highlights a linear relation between confinement pressure amplitude and the AE response amplitude, observations which agree with recent higher frequency experimental results on dynamic triggering. The magnitude-frequency distribution of AEs is also computed. The Gutenberg-Richter b-value oscillates with stress oscillations. Our experiments may help complement our understanding of the influence of low inertia stress phenomena on the distribution of seismicity, such as observations of dynamic triggering and seismicity modulation by tides or hydrological loading. Numéro de notice : A2023-095 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2022JB025583 Date de publication en ligne : 13/04/2023 En ligne : https://doi.org/10.1029/2022JB025583 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103211 - Brief communication: Glacier mapping and change estimation using very high-resolution declassified Hexagon KH-9 panoramic stereo imagery (1971-1984) [Article/Communication] / Sajid Ghuffar, Auteur ; Owen King, Auteur ; Grégoire Guillet, Auteur ; Ewelina Rupnik, Auteur ; Tobias Bolch, Auteur . - 2023 . - pp 1299 - 1306.bibliographieLangues : Anglais (eng)in The Cryosphere > vol 17 n° 3 (March 2023) . - pp 1299 - 1306
Descripteur : [Vedettes matières IGN] Applications de télédétection[Termes IGN] analyse diachronique[Termes IGN] glacier[Termes IGN] image Corona[Termes IGN] image panoramique[Termes IGN] image Pléiades-HR[Termes IGN] image SPOT Résumé : (auteur) The panoramic cameras (PCs) on board Hexagon KH-9 (KH-9PC) satellite missions from 1971–1984 captured very high-resolution stereo imagery with up to 60 cm spatial resolution. This study explores the potential of this imagery for glacier mapping and change estimation. We assess KH-9PC imagery using data from the KH-9 mapping camera (KH-9MC), KH-4PC, and SPOT and Pléiades satellite imagery. The high resolution of KH-9PC leads to higher-quality DEMs, which better resolve the accumulation region of the glaciers in comparison to the KH-9MC. On stable terrain, KH-9PC DEMs achieve an elevation accuracy of ChatGPT pour la géomatique, potentiel d’utilisation et limites
ChatGPT pour la géomatique, potentiel d’utilisation et limites [Article/Communication] / Emmanuel Clédat, Auteur ; Philippe Sablayrolles, Auteur . - 2023 . - pp 19 - 23.BibliographieLangues : Français (fre)in XYZ > n° 174 (mars 2023) . - pp 19 - 23Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] intelligence artificielle[Termes IGN] langage naturel (informatique)[Termes IGN] multilatération[Termes IGN] parangonnage Résumé : (Auteur) ChatGPT a été le sujet de discussion récurent durant les fêtes de fin d’année 2022 (ou en tout cas le sujet de discussion récurrent chez les geeks !). Certains trouvent cet outil formidable, d’autres dystopique, mais de quoi s’agit-il exactement? C’est ce que l’on appelle un outil conversationnel en langage naturel, c’est-à-dire une intelligence artificielle capable de générer du texte suite à une requête exprimée sous forme d’une ou plusieurs phrases. Numéro de notice : A2023-068 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtSansCL DOI : sans Date de publication en ligne : 01/03/2023 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102845 Deriving map images of generalised mountain roads with generative adversarial networks
Deriving map images of generalised mountain roads with generative adversarial networks [Article/Communication] / Azelle Courtial, Auteur ; Guillaume Touya, Auteur ; Xiang Zhang, Auteur . - 2023 . - pp 499 - 528.bibliographieLangues : Anglais (eng)in International journal of geographical information science IJGIS > vol 37 n° 3 (March 2023) . - pp 499 - 528Descripteur : [Termes IGN] analyse comparative[Termes IGN] apprentissage dirigé[Termes IGN] apprentissage non-dirigé[Termes IGN] carte routière[Termes IGN] données d'entrainement (apprentissage automatique)[Termes IGN] généralisation cartographique automatisée[Termes IGN] montagne[Termes IGN] réseau antagoniste génératif[Vedettes matières IGN] Généralisation Résumé : (auteur) Map generalisation is a process that transforms geographic information for a cartographic at a specific scale. The goal is to produce legible and informative maps even at small scales from a detailed dataset. The potential of deep learning to help in this task is still unknown. This article examines the use case of mountain road generalisation, to explore the potential of a specific deep learning approach: generative adversarial networks (GAN). Our goal is to generate images that depict road maps generalised at the 1:250k scale, from images that depict road maps of the same area using un-generalised 1:25k data. This paper not only shows the potential of deep learning to generate generalised mountain roads, but also analyses how the process of deep learning generalisation works, compares supervised and unsupervised learning and explores possible improvements. With this experiment we have exhibited an unsupervised model that is able to generate generalised maps evaluated as good as the reference and reviewed some possible improvements for deep learning-based generalisation, including training set management and the definition of a new road connectivity loss. All our results are evaluated visually using a four questions process and validated by a user test conducted on 113 individuals. Numéro de notice : A2023-073 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2022.2123488 Date de publication en ligne : 20/10/2022 En ligne : https://doi.org/10.1080/13658816.2022.2123488 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101901 Programme LiDAR HD : vers une nouvelle cartographie 3D du territoire
Programme LiDAR HD : vers une nouvelle cartographie 3D du territoire [Article/Communication] / Terry Moreau, Auteur ; Hélène Buissart, Auteur ; Arnaud Allgeyer, Auteur ; Sofiane Kriat, Auteur ; Pierre-Yves Decavele, Auteur ; Romuald Dore, Auteur ; Gabrielle Roy, Auteur . - 2023 . - pp 45 - 49.Langues : Français (fre)in XYZ > n° 174 (mars 2023) . - pp 45 - 49Descripteur : [Vedettes matières IGN] Lasergrammétrie[Termes IGN] acquisition de données[Termes IGN] cartographie 3D[Termes IGN] diffusion de données[Termes IGN] données lidar[Termes IGN] données localisées 3D[Termes IGN] France métropolitaine[Termes IGN] QGIS[Termes IGN] semis de points[Termes IGN] système d'information géographique[Termes IGN] télémétrie laser aéroporté Résumé : (Auteur) Le programme LiDAR HD est d’une ampleur inédite et porte un objectif ambitieux : acquérir des données LiDAR haute densité (HD) sur l’ensemble du territoire métropolitain et ultramarin (hors Guyane) pour en proposer la description 3D la plus fine jamais établie à l’échelle France entière. L’IGN coordonne ce programme et s’emploie à soutenir tous les usages de ce géocommun en devenir. Numéro de notice : A2023-171 Affiliation des auteurs : IGN (2020- ) Thématique : GEOMATIQUE/IMAGERIE Nature : Article nature-HAL : ArtSansCL DOI : sans Date de publication en ligne : 01/03/2023 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102856 SALT: A multifeature ensemble learning framework for mapping urban functional zones from VGI data and VHR images [Article/Communication] / Hao Wu, Auteur ; Wenting Luo, Auteur ; Anqi Lin, Auteur ; Fanghua Hao, Auteur ; Ana-Maria Olteanu-Raimond, Auteur ; Lanfa Liu, Auteur ; Yan Li, Auteur . - 2023 . - n° 101921.Bibliographie This work was supported by the National Natural Science Foundation of China [42201468, 42071358], Postdoctoral Innovation Talents Support Program of China [BX20220128], China Postdoctoral Science Foundation [2022M721283] and Fundamental Research Funds for the Central Universities [CCNU22QN018].Langues : Anglais (eng)in Computers, Environment and Urban Systems > vol 100 (March 2023) . - n° 101921Descripteur : [Vedettes matières IGN] Analyse spatiale[Termes IGN] analyse multicritère[Termes IGN] apprentissage automatique[Termes IGN] boosting adapté[Termes IGN] cartographie urbaine[Termes IGN] Chine[Termes IGN] détection du bâti[Termes IGN] données localisées des bénévoles[Termes IGN] image à très haute résolution[Termes IGN] morphologie urbaine[Termes IGN] OpenStreetMap[Termes IGN] point d'intérêt[Termes IGN] représentation spatiale[Termes IGN] zone urbaine Résumé : (auteur) Urban functional zone mapping is essential for providing deeper insights into urban morphology and improving urban planning. The emergence of Volunteered Geographic Information (VGI), which provides abundant semantic data, offers a great opportunity to enrich land use information extracted from remote sensing (RS) images. Taking advantage of very-high-resolution (VHR) images and VGI data, this work proposed a SATL multifeature ensemble learning framework for mapping urban functional zones that integrated 65 features from the shapes of building objects, attributes of points of interest (POIs) tags, locations of cellphone users and textures of VHR images. The dimensionality of SALT features was reduced by the autoencoder, and the compressed features were applied to train the ensemble learning model composed of multiple classifiers for optimizing the urban functional zone classification. The effectiveness of the proposed framework was tested in an urbanized region of Nanchang City. The results indicated that the SALT features considering population dynamics and building shapes are comprehensive and feasible for urban functional zone mapping. The autoencoder has been proven efficient for dimension reduction of the original SALT features as it significantly improves the classification of urban functional zones. Moreover, the ensemble learning outperforms other machine learning models in terms of the accuracy and robustness when dealing with multi-classification tasks. Numéro de notice : A2023-125 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/IMAGERIE/INFORMATIQUE Nature : Article DOI : 10.1016/j.compenvurbsys.2022.101921 Date de publication en ligne : 06/12/2022 En ligne : https://doi.org/10.1016/j.compenvurbsys.2022.101921 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102504 Improving quantitative structure models with an Huxley protocol based filter
Improving quantitative structure models with an Huxley protocol based filter [Article/Communication] / Jan Hackenberg, Auteur ; Jean-Daniel Bontemps, Auteur . - 2023.bibliographie preprint https://doi.org/10.21203/rs.3.rs-2818844/v1Langues : Anglais (eng)in Applied geomatics > vol 15 n° inconnu (2023)Descripteur : [Termes IGN] données localisées 3D[Termes IGN] modélisation de la forêt[Termes IGN] semis de points[Vedettes matières IGN] Inventaire forestier Résumé : (auteur) Quantitative structure models (QSMs) are topological ordered cylinder models of trees which describe the branching structure up to the tips. Methods : We present unpublished tree describing parameters which can be derived [rein a single Quantitative Structure Model QSM. The parameters are used to build two Radius correction filters. Results : For validation we use QSMs produced from an open point cloud data set of tree clouds with the SimpleForest software. We coin-pare the QSM volume against the harvested reference data for 65 felled trees. We also found QSM data of Tree QSM, a competitive and broadly accepted QSM modeling tool. Our RMSE was less than 40 % of the TreeQSM RMSE. For other error measures, the r2adi and the CCC, the relative improvement looked even better with reaching only 27 % and 21 % of the TreeQSM errors respectively. Conclusions: In forest ecology we should use the here presented pipeline to build accurate CPIs for reasons of: Quality - With the invention of the QSM Radius filter techniques we improve tree volume prediction capabilities utilizing QSMs. Quantity - More data can be collected with QSMs than with traditional methods. Here we use models build on more than ten thousand measurements. Numéro de notice : A2023-178 Affiliation des auteurs : LIF+Ext (2020- ) Thématique : FORET/INFORMATIQUE/MATHEMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103320 Is the radial distance really a distance? An analysis of its properties and interest for the matching of polygon features [Article/Communication] / Yann Méneroux, Auteur ; Ibrahim Maidaneh Abdi, Auteur ; Arnaud Le Guilcher, Auteur ; Ana-Maria Olteanu-Raimond, Auteur . - 2023 . - pp 438 - 475.bibliographie This work was supported by the French National Mapping Agency: Institut National de l’Information Géographique et Forestière (IGN) and by the University of DjiboutiLangues : Anglais (eng)in International journal of geographical information science IJGIS > vol 37 n° 2 (February 2023) . - pp 438 - 475Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] abaque[Termes IGN] algorithme de Douglas-Peucker[Termes IGN] appariement de formes[Termes IGN] bâtiment[Termes IGN] BD Topo[Termes IGN] distance[Termes IGN] généralisation[Termes IGN] géométrie analytique[Termes IGN] modèle analytique[Termes IGN] polygone[Termes IGN] propagation d'erreur[Termes IGN] transformation rapide de Fourier Résumé : (auteur) In this paper, we examine the properties of the radial distance which has been used as a tool to compare the shape of simple surfacic objects. We give a rigorous definition of the radial distance and derive its theoretical properties, and in particular under which conditions it satisfies the distance properties. We show how the computation of the radial distance can be implemented in practice and made faster by the use of an analytical formula and a Fast Fourier Transform. Finally, we conduct experiments to measure how the radial distance is impacted by perturbation and generalization and we give abacuses and thresholds to deduce when buildings are likely to be homologous or non-homologous given their radial distance. Numéro de notice : A2023-074 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2022.2123487 Date de publication en ligne : 23/09/2022 En ligne : https://doi.org/10.1080/13658816.2022.2123487 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101671 Multi-nomenclature, multi-resolution joint translation: an application to land-cover mapping
Multi-nomenclature, multi-resolution joint translation: an application to land-cover mapping [Article/Communication] / Luc Baudoux, Auteur ; Jordi Inglada, Auteur ; Clément Mallet, Auteur . - 2023 . - pp 403 - 437.bibliographieLangues : Anglais (eng)in International journal of geographical information science IJGIS > vol 37 n° 2 (February 2023) . - pp 403 - 437Descripteur : [Vedettes matières IGN] Cartographie thématique[Termes IGN] apprentissage profond[Termes IGN] carte d'occupation du sol[Termes IGN] carte d'utilisation du sol[Termes IGN] carte thématique[Termes IGN] classification par réseau neuronal convolutif[Termes IGN] données d'entrainement (apprentissage automatique)[Termes IGN] harmonisation des données[Termes IGN] nomenclature[Termes IGN] pouvoir de résolution géométrique Résumé : (auteur) Land-use/land-cover (LULC) maps describe the Earth’s surface with discrete classes at a specific spatial resolution. The chosen classes and resolution highly depend on peculiar uses, making it mandatory to develop methods to adapt these characteristics for a large range of applications. Recently, a convolutional neural network (CNN)-based method was introduced to take into account both spatial and geographical context to translate a LULC map into another one. However, this model only works for two maps: one source and one target. Inspired by natural language translation using multiple-language models, this article explores how to translate one LULC map into several targets with distinct nomenclatures and spatial resolutions. We first propose a new data set based on six open access LULC maps to train our CNN-based encoder-decoder framework. We then apply such a framework to convert each of these six maps into each of the others using our Multi-Landcover Translation network (MLCT-Net). Extensive experiments are conducted at a country scale (namely France). The results reveal that our MLCT-Net outperforms its semantic counterparts and gives on par results with mono-LULC models when evaluated on areas similar to those used for training. Furthermore, it outperforms the mono-LULC models when applied to totally new landscapes. Numéro de notice : A2023-075 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2022.2120996 Date de publication en ligne : 10/10/2022 En ligne : https://doi.org/10.1080/13658816.2022.2120996 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101797 Temporal spectrum of spatial correlations between GNSS station position time series
Temporal spectrum of spatial correlations between GNSS station position time series [Article/Communication] / Yujiao Niu, Auteur ; Paul Rebischung, Auteur ; Min Li, Auteur ; Na Wei, Auteur ; Chuang Shi, Auteur ; Zuheir Altamimi, Auteur . - 2023 . - n° 12.bibliographieLangues : Anglais (eng)in Journal of geodesy > vol 97 n° 2 (February 2023) . - n° 12Descripteur : [Termes IGN] analyse spatio-temporelle[Termes IGN] bruit blanc[Termes IGN] corrélation automatique de points homologues[Termes IGN] filtrage du bruit[Termes IGN] série temporelle[Termes IGN] station GNSS[Termes IGN] transformation de Fourier[Vedettes matières IGN] Traitement de données GNSS Résumé : (auteur) The background noise in Global Navigation Satellite Systems (GNSS) station position time series is known to be both temporally and spatially correlated. Its temporal correlations are well modeled and routinely taken into account when deriving parameters of interest like station velocities. On the other hand, a general model of the spatial correlations in GNSS time series is lacking, and they are usually ignored, although their consideration could benefit several purposes such as offset detection, velocity estimation or spatial filtering. In order to improve the realism of current spatio-temporal correlation models, we investigate in this study how the spatial correlations of GNSS time series vary with the temporal frequency. A frequency-dependent measure of the spatial correlations is therefore introduced and applied to station position time series from the latest reprocessing campaign of the International GNSS Service (IGS), as well as to Precise Point Positioning time series provided by the Nevada Geodetic Laboratory (NGL). Different spatial correlation regimes are thus evidenced at different temporal frequencies. The different levels of spatial correlations between IGS and NGL datasets furthermore suggest that some part of the spatially correlated background noise in GNSS time series consists of GNSS errors rather than aperiodic Earth surface deformation signal. Numéro de notice : A2023-226 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-023-01703-7 Date de publication en ligne : 06/02/2023 En ligne : https://doi.org/10.1007/s00190-023-01703-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102746 The European GeoMetre project: developing enhanced large-scale dimensional metrology for geodesy
The European GeoMetre project: developing enhanced large-scale dimensional metrology for geodesy [Article/Communication] / Florian Pollinger, Auteur ; Sergio Baselga, Auteur ; Clément Courde, Auteur ; Cornelia Eschelbach, Auteur ; Luis García-Asenjo, Auteur ; Pascual Garrigues, Auteur ; Joffray Guillory, Auteur ; Per Olof Hedekvist, Auteur ; Tuomas Helojärvi, Auteur ; Jorma Jokela, Auteur ; Ulla Kallio, Auteur ; Thomas Klügel, Auteur ; Paul Köchert, Auteur ; Michael Lösler, Auteur ; Raquel Luján, Auteur ; Tobias Meyer, Auteur ; Pavel Neyezhmakov, Auteur ; Damien Pesce, Auteur ; et al., Auteur . - 2023.bibliographieLangues : Anglais (eng)in Applied geomatics > vol 15 n° inconnu (2023)Descripteur : [Vedettes matières IGN] Géodésie[Termes IGN] grande échelle[Termes IGN] métrologie tridimensionnelle Résumé : (auteur) We provide a survey on the joint European research project “GeoMetre”, which explores novel technologies and their inclusion to existing surveying strategies to improve the traceability of geodetic reference frames to the SI definition of the metre. This work includes the development of novel distance meters with a range of up to 5 km, the realisation of optical multilateration systems for large structure monitoring at an operation distance of 50 m and beyond, and a novel strategy for GNSS-based distance determination. Different methods for refractivity compensation, based on classical sensors, on dispersion, on spectroscopic thermometry, and on the speed of sound to reduce the meteorological uncertainties in precise distance measurements, are developed further and characterised. These systems are validated at and applied to the novel European standard baseline EURO5000 at the Pieniny Kippen Belt, Poland, which was completely refurbished and intensely studied in this project. We use our novel instruments for a reduced uncertainty of the scale in the surveillance networks solutions for local tie measurements at space-geodetic co-location stations. We also investigate novel approaches like close-range photogrammetry to reference point determination of space-geodetic telescopes. Finally, we also investigate the inclusion of the local gravity field to consider the deviations of the vertical in the data analysis and to reduce the uncertainty of coordinate transformations in this complex problem. Numéro de notice : A2023-089 Affiliation des auteurs : IGN+Ext (2020- ) Autre URL associée : vers HAL Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s12518-022-00487-3 Date de publication en ligne : 20/02/2023 En ligne : https://doi.org/10.1007/s12518-022-00487-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103089 Where am I now? modelling disorientation in pan-scalar maps
Where am I now? modelling disorientation in pan-scalar maps [Article/Communication] / Guillaume Touya, Auteur ; Maieul Gruget, Auteur ; Ian Muehlenhaus, Auteur . - 2023 . - n° 62.bibliographieLangues : Anglais (eng)in ISPRS International journal of geo-information > vol 12 n° 2 (February 2023) . - n° 62Descripteur : [Termes IGN] cognition[Termes IGN] données multiéchelles[Termes IGN] échelle cartographique[Termes IGN] interaction homme-machine[Termes IGN] lecture de carte[Termes IGN] représentation mentale[Termes IGN] représentation mentale spatiale[Termes IGN] représentation multiple[Vedettes matières IGN] Généralisation Résumé : (auteur) Disorientation is a common feeling for all users of zoomable multi-scale maps, even for those with good orientation and spatial skills. We make the assumption that this problem is mainly due to the desert fog effect, documented in human–computer interaction within multi-scale zoomable environments. Starting with a collection of reported experiences of disorientation, this paper explores this notion from the spatial cognition, philosophical and human–computer interaction perspectives and proposes a model of disorientation in the exploration of multi-scale maps. We argue that disorientation is a problem of reconciliation between the current map view and the mental map of the user, where landmarks visible on the map or memorised in the mental map play a key role. The causes for failed reconciliation are discussed and illustrated by our collected experiences of disorientation. Numéro de notice : A2023-130 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi12020062 En ligne : https://doi.org/10.3390/ijgi12020062 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102585 The ULR-repro3 GPS data reanalysis and its estimates of vertical land motion at tide gauges for sea level science [Article/Communication] / Médéric Gravelle, Auteur ; Guy Wöppelmann, Auteur ; Kevin Gobron, Auteur ; Zuheir Altamimi, Auteur ; Mikaël Guichard, Auteur ; Thomas Herring, Auteur ; Paul Rebischung, Auteur . - 2023 . - pp 497 - 509.bibliographieLangues : Anglais (eng)in Earth System Science Data > vol 15 n° 1 (2023) . - pp 497 - 509Descripteur : [Vedettes matières IGN] Géodésie physique[Termes IGN] déformation verticale de la croute terrestre[Termes IGN] données marégraphiques[Termes IGN] littoral[Termes IGN] série temporelle[Termes IGN] système d'observation du niveau des eaux littorales SONEL[Termes IGN] vitesse de déplacement Résumé : (auteur) A new reanalysis of GNSS data at or near tide gauges worldwide was produced by the university of La Rochelle (ULR) group within the 3rd International GNSS Service (IGS) reprocessing campaign (repro3). The new solution, called ULR-repro3, complies with the IGS standards adopted for repro3, implementing advances in data modelling and corrections since the previous reanalysis campaign, and extending the average record length by about 7 years. The results presented here focus on the main products of interest for sea level science, that is, the station position time series and associated velocities on the vertical component at tide gauges. These products are useful to estimate accurate vertical land motion at the coast and supplement data from satellite altimetry or tide gauges for an improved understanding of sea level changes and their impacts along coastal areas. To provide realistic velocity uncertainty estimates, the noise content in the position time series was investigated considering the impact of non-tidal atmospheric loading. Overall, the ULR-repro3 position time series show reduced white noise and power-law amplitudes and station velocity uncertainties compared to the previous reanalysis. The products are available via SONEL (https://doi.org/10.26166/sonel_ulr7a; Gravelle et al., 2022). Numéro de notice : A2023-079 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/essd-15-497-2023 Date de publication en ligne : 01/02/2023 En ligne : https://doi.org/10.5194/essd-15-497-2023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102521 AI4GEO: LOD0 Generation for 3D building models (2023)
AI4GEO: LOD0 Generation for 3D building models [Article/Communication] / Pierre Lassalle, Auteur ; Bruno Vallet, Auteur ; Etienne Le Bihan, Auteur ; Pierre-Marie Brunet, Auteur . - New York : Institute of Electrical and Electronics Engineers IEEE, 2023.BibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Applications photogrammétriques[Termes IGN] image satellite[Termes IGN] niveau de détail[Termes IGN] reconstruction 3D du bâti[Termes IGN] zone urbaine Résumé : (Auteur) Recent studies on Earth observation are improved by the proliferation of imaging sensors able to capture large datasets with a high spatial resolution. As a result, many approaches have been proposed for 3D modeling, remote sensing (RS), image processing and mapping. In this scope, three-dimensional (3D) mapping of urban areas has a great potential to provide the user with a precise scene understanding. The AI4GEO project aims at developing an automatic solution for producing 3D geospatial information with new added-value services. This paper will first introduce the AI4GEO initiative, context and overall objectives. It will then present the current status regarding 3D reconstruction of urban areas, in particular LOD0 building shape generation using satellite data. Numéro de notice : C2023-010 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : IMAGERIE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1109/JURSE57346.2023.10144155 Date de publication en ligne : 08/06/2023 En ligne : https://doi.org/10.1109/JURSE57346.2023.10144155 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103311 Analysis of cycling network evolution in OpenStreetMap through a data quality prism (2023)
Analysis of cycling network evolution in OpenStreetMap through a data quality prism [Article/Communication] / Raphaël Bres, Auteur ; Veronika Peralta, Auteur ; Arnaud Le Guilcher, Auteur ; Thomas Devogele, Auteur ; Ana-Maria Olteanu-Raimond, Auteur ; Cyril de Runz, Auteur . - Göttingen : Copernicus publications, 2023 . - n° 3 ; 9 p.. - (AGILE GIScience Series; 4) .bibliographie voir aussi le rapport de reproductibilité : https://doi.org/10.17605/OSF.IO/9KP7ULangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Analyse spatiale[Termes IGN] bicyclette[Termes IGN] méthode de Monte-Carlo[Termes IGN] mobilité territoriale[Termes IGN] mobilité urbaine[Termes IGN] modèle de simulation[Termes IGN] OpenStreetMap[Termes IGN] qualité des données[Termes IGN] voie cyclable Résumé : (auteur) Cycling practice has been constantly increasing for several years and the COVID crisis has just accelerated the process. Indeed, more and more municipalities have developed new cycle paths to facilitate cycling. Considering this increasing interest for cycling, it makes sense to study how this recent evolution is reflected in the underlying representation of the cycling network in the geographic databases. Main studies analysing the evolution of the road network focus on the motor vehicle network in the major cities of the world. These studies do not seem applicable to cycling network specially to some low population density areas or even to smaller cities. This paper analyses the changes in the cycling network through OSM data from a data freshness perspective. These changes can be either updates from changes in the real-world network or upgrades to the network. To these end, we propose a method using a Monte Carlo simulation (MCS) to analyse the frequency of changes in cycling routes in several areas with different population density, all in the Loire Valley region in France. We also define the cycling network, which is a very complex concept and we explain how it is represented in OSM data and suffers from different data quality issues. Results show that the number of changes across time are similar in areas having a similar population density, while being lower in low population density areas. These phenomena is higher in the cycling network compared to other networks. Numéro de notice : C2023-011 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Autre URL associée : Vers HAL Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/agile-giss-4-3-2023 Date de publication en ligne : 06/06/2023 En ligne : https://doi.org/10.5194/agile-giss-4-3-2023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103308 AnchorWhat : Décompositions de cartes pan-scalaires (2023)
AnchorWhat : Décompositions de cartes pan-scalaires [Article/Communication] / Maieul Gruget, Auteur ; Guillaume Touya, Auteur . - Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-), 2023.Langues : Français (fre)Descripteur : [Vedettes matières IGN] Généralisation Résumé : (auteur) Poster de vulgarisation scientifique à la journée de la recherche IGN 2023. Inspiré de la théorie des ancres de Couclelis et collègues, ce poster présente une méthodologie d'analyse de présence et persistance d'éléments cartographiques à travers différentes explorations cartographiques. Numéro de notice : C2023-002 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : GEOMATIQUE Nature : Poster nature-HAL : Poster-sans-CL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103185 A benchmark of nested named entity recognition approaches in historical structured documents (2023)
A benchmark of nested named entity recognition approaches in historical structured documents [Article/Communication] / Solenn Tual, Auteur ; Nathalie Abadie, Auteur ; Joseph Chazalon, Auteur ; Bertrand Duménieu, Auteur ; Edwin Carlinet, Auteur . - Champs-sur-Marne [France] : Université Gustave Eiffel, 2023 . - 18 p. ; 21 x 30 cm.BibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] langage naturel (informatique)[Termes IGN] reconnaissance de noms[Termes IGN] traitement du langage naturel Résumé : (Auteur) Named Entity Recognition (NER) is a key step in the creation of structured data from digitised historical documents. Traditional NER approaches deal with flat named entities, whereas entities often are nested. For example, a postal address might contain a street name and a number. This work compares three nested NER approaches, including two state-of-the-art approaches using Transformer-based architectures. We introduce a new Transformer-based approach based on joint labelling and semantic weighting of errors, evaluated on a collection of 19 th-century Paris trade directories. We evaluate approaches regarding the impact of supervised fine-tuning, unsupervised pre-training with noisy texts, and variation of IOB tagging formats. Our results show that while nested NER approaches enable extracting structured data directly, they do not benefit from the extra knowledge provided during training and reach a performance similar to the base approach on flat entities. Even though all 3 approaches perform well in terms of F1 scores, joint labelling is most suitable for hierarchically structured data. Finally, our experiments reveal the superiority of the IO tagging format on such data. Numéro de notice : P2023-001 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/TOPONYMIE Nature : Preprint nature-HAL : Préprint DOI : sans Date de publication en ligne : 20/02/2023 En ligne : https://hal.science/hal-03994759v1/document Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102602 
BIM et enjeux climatiques, ch. City Information Modelling pour des aménagements sobres et durables : potentiel du CIM pour calculer l’intensité urbaine [Chapitre/Contribution] / Adeline Deprêtre, Auteur ; Florence Jacquinod, Auteur ; Bruno Barroca, Auteur ; Vincent Becue, Auteur . - Paris : Eyrolles, 2023 . - pp.ISBN : 978-2-416-00841-2bibliographie
Projet E3SLangues : Français (fre)Descripteur : [Vedettes matières IGN] Analyse spatiale[Termes IGN] densité de population[Termes IGN] format Industry foudation classes IFC[Termes IGN] impact sur l'environnement[Termes IGN] planification urbaine[Termes IGN] urbanisme Résumé : (auteur) Les analyses urbaines font partie des méthodes déployées afin de tendre vers un urbanisme durable, diminuant l’impact de la construction et de la planification sur les ressources. Dans cet article nous proposons d’explorer le potentiel des City Information Models (CIM) pour étudier l’intensité urbaine à l’échelle d’un quartier, prenant en considération plusieurs paramètres contribuant à ses impacts environnementaux. Nous utilisons pour cela les premières versions du CIM du quartier La Vallée, actuellement en cours de construction. Nous exposons notre méthode expérimentale compatible avec le format ouvert IFC afin de pouvoir reproduire la démarche sur d’autres quartiers. Nous présentons ensuite une partie de nos résultats sur l’exploitation du CIM pour l’évaluation de l’intensité urbaine en phase conception. Enfin, nous proposons diverses préconisations afin de faciliter la constitution de CIM aisément mobilisables pour les analyses urbaines, mais également pour d’autres types d’analyses pouvant contribuer à la conception ou au réaménagement de quartiers en limitant leurs impacts environnementaux. Numéro de notice : H2023-001 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/URBANISME Nature : Chapître / contribution En ligne : https://hal.science/hal-04061004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102988 CDPS: Constrained DTW-Preserving Shapelets (2023)
CDPS: Constrained DTW-Preserving Shapelets [Article/Communication] / Hussein El Amouri, Auteur ; Thomas Lampert, Auteur ; Pierre Gançarski, Auteur ; Clément Mallet, Auteur . - Berlin, Heidelberg, Vienne, New York, ... : Springer, 2023 . - pp 21 - 37. - (Lecture notes in Computer Science. Lecture Notes in Artificial Intelligence, ISSN 0302-9743; 13713) .bibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] analyse de données[Termes IGN] analyse de groupement[Termes IGN] classification[Termes IGN] déformation temporelle dynamique (algorithme)[Termes IGN] distance euclidienne[Termes IGN] jeu de données localisées[Termes IGN] série temporelle[Termes IGN] traitement de données localisées[Termes IGN] transformation Résumé : (auteur) The analysis of time series for clustering and classification is becoming ever more popular because of the increasingly ubiquitous nature of IoT, satellite constellations, and handheld and smart-wearable devices, etc. The presence of phase shift, differences in sample duration, and/or compression and dilation of a signal means that Euclidean distance is unsuitable in many cases. As such, several similarity measures specific to time-series have been proposed, Dynamic Time Warping (DTW) being the most popular. Nevertheless, DTW does not respect the axioms of a metric and therefore Learning DTW-Preserving Shapelets (LDPS) have been developed to regain these properties by using the concept of shapelet transform. LDPS learns an unsupervised representation that models DTW distances using Euclidean distance in shapelet space. This article proposes constrained DTW-preserving shapelets (CDPS), in which a limited amount of user knowledge is available in the form of must link and cannot link constraints, to guide the representation such that it better captures the user’s interpretation of the data rather than the algorithm’s bias. Subsequently, any unconstrained algorithm can be applied, e.g. K-means clustering, k-NN classification, etc, to obtain a result that fulfils the constraints (without explicit knowledge of them). Furthermore, this representation is generalisable to out-of-sample data, overcoming the limitations of standard transductive constrained-clustering algorithms. CLDPS is shown to outperform the state-of-the-art constrained-clustering algorithms on multiple time-series datasets. Numéro de notice : C2022-052 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Autre URL associée : vers HAL Thématique : GEOMATIQUE/INFORMATIQUE/MATHEMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-031-26387-3_2 Date de publication en ligne : 17/03/2023 En ligne : https://doi.org/10.1007/978-3-031-26387-3_2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103157 Création d’une base de connaissances topographiques à partir des "Instructions nautiques" (2023)
Création d’une base de connaissances topographiques à partir des "Instructions nautiques" [Article/Communication] / Helen Mair Rawsthorne, Auteur . - Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-), 2023.Langues : Français (fre)Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] base de connaissances[Termes IGN] données topographiques Résumé : (auteur) Ma thèse de doctorat vise à explorer les potentialités de l’extraction automatique d’information à composante spatiale dans des textes pour construire une base de connaissances géoréférencées. Il s’agit d’extraire, typer et désambiguïser les informations sur les entités topographiques décrites par des textes (type d’entité géographique, nom, relations spatiales avec d’autres entités) et puis les structurer selon un modèle ontologique. Ceci permettra de vérifier la cohérence des informations extraites, d’inférer de nouveaux faits et de répondre à des requêtes sur l’environnement modélisé. Le corpus utilisé pour réalisé ce travail est composé des Instructions nautiques, une serie d'ouvrages publiés par le Service hydrographique et océanographique de la Marine (Shom) qui décrivent l'environnement maritime et comment naviguer autour de la côte. Numéro de notice : C2023-001 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésNat DOI : sans En ligne : https://hal.science/hal-04055379 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102983 Création d’un graphe de connaissances géohistorique à partir d’annuaires du commerce parisien du 19ème siècle : application aux métiers de la photographie [Article/Communication] / Solenn Tual, Auteur ; Nathalie Abadie, Auteur ; Bertrand Duménieu, Auteur ; Joseph Chazalon, Auteur ; Edwin Carlinet, Auteur . - Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-), 2023.bibliographieLangues : Français (fre)Descripteur : [Vedettes matières IGN] Analyse spatiale[Termes IGN] analyse spatio-temporelle[Termes IGN] bruit (théorie du signal)[Termes IGN] entité géographique[Termes IGN] réseau sémantique[Termes IGN] visualisation 4D Index. décimale : 37.20 Analyse spatiale et ses outils Résumé : (auteur) Les annuaires professionnels anciens, édités à un rythme soutenu dans de nombreuses villes européennes tout au long des XIXe et XXe siècles, forment un corpus de sources unique par son volume et la possibilité qu'ils donnent de suivre les transformations urbaines à travers le prisme des activités professionnelles des habitants, de l'échelle individuelle jusqu'à celle de la ville entière. L'analyse spatiotemporelle d'un type de commerces au travers des entrées d'annuaires demande cependant un travail considérable de recensement, de transcription et de recoupement manuels. Pour pallier cette difficulté, cet article propose une approche automatique pour construire et visualiser un graphe de connaissances géohistorique des commerces figurant dans des annuaires anciens. L'approche est testée sur des annuaires du commerce parisien du XIXe siècle allant de 1799 à 1908, sur le cas des métiers de la photographie. Numéro de notice : C2023-012 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://hal.science/hal-04121643 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103319 DeepSim-Nets: Deep Similarity Networks for stereo image matching (2023)
DeepSim-Nets: Deep Similarity Networks for stereo image matching [Article/Communication] / Mohamed Ali Chebbi, Auteur ; Ewelina Rupnik, Auteur ; Marc Pierrot-Deseilligny, Auteur ; Paul Lopes, Auteur . - Computer vision foundation CVF, 2023 . - pp 2096 - 2104.bibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Traitement d'image optique[Termes IGN] appariement d'images[Termes IGN] chaîne de traitement[Termes IGN] géométrie de l'image[Termes IGN] géométrie épipolaire[Termes IGN] réseau neuronal profond Index. décimale : 35.20 Traitement d'image Résumé : (auteur) We present three multi-scale similarity learning architectures, or DeepSim networks. These models learn pixel-level matching with a contrastive loss and are agnostic to the geometry of the considered scene. We establish a middle ground between hybrid and end-to-end approaches by learning to densely allocate all corresponding pixels of an epipolar pair at once. Our features are learnt on large image tiles to be expressive and capture the scene's wider context. We also demonstrate that curated sample mining can enhance the overall robustness of the predicted similarities and improve the performance on radiometrically homogeneous areas. We run experiments on aerial and satellite datasets. Our DeepSim-Nets outperform the baseline hybrid approaches and generalize better to unseen scene geometries than end-to-end methods. Our flexible architecture can be readily adopted in standard multi-resolution image matching pipelines. The code is available at https://github.com/DaliCHEBBI/DeepSimNets. Numéro de notice : C2023-007 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : IMAGERIE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://openaccess.thecvf.com/content/CVPR2023W/EarthVision/html/Chebbi_DeepSim- [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103281 Entry separation using a mixed visual and textual language model: Application to 19th century French trade directories [Article/Communication] / Bertrand Duménieu, Auteur ; Edwin Carlinet, Auteur ; Nathalie Abadie, Auteur ; Joseph Chazalon, Auteur . - Champs-sur-Marne [France] : Université Gustave Eiffel, 2023 . - 20 p. ; 21 x 30 cm.BibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] annuaire[Termes IGN] dix-neuvième siècle[Termes IGN] modèle de langue[Termes IGN] reconnaissance de noms Résumé : (Auteur) When extracting structured data from repetitively organized documents, such as dictionaries, directories, or even newspapers, a key challenge is to correctly segment what constitutes the basic text regions for the target database. Traditionally, such a problem was tackled as part of the layout analysis and was mostly based on visual clues for dividing (top-down) approaches. Some agglomerating (bottom-up) approaches started to consider textual information to link similar contents, but they required a proper over-segmentation of ne-grained units. In this work, we propose a new pragmatic approach whose eciency is demonstrated on 19 th century French Trade Directories. We propose to consider two sub-problems: coarse layout detection (text columns and reading order), which is assumed to be eective and not detailed here, and a ne-grained entry separation stage for which we propose to adapt a state-of-the-art Named Entity Recognition (NER) approach. By injecting special visual tokens, coding, for instance, indentation or breaks, into the token stream of the language model used for NER purpose, we can leverage both textual and visual knowledge simultaneously. Code, data, results and models are available at https://github.com/soduco/ paper-entryseg-icdar23-code, https://huggingface.co/HueyNemud/ (icdar23-entrydetector* variants). Numéro de notice : P2023-002 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/INFORMATIQUE/TOPONYMIE Nature : Preprint nature-HAL : Préprint DOI : sans Date de publication en ligne : 17/02/2023 En ligne : https://hal.science/hal-03994702v1/ Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102609 Exploring the potential of deep learning for map generalization (2023)
Exploring the potential of deep learning for map generalization [Thèse/HDR] / Azelle Courtial, Auteur ; Guillaume Touya, Directeur de thèse ; Xiang Zhang, Directeur de thèse . - Champs-sur-Marne [France] : Université Gustave Eiffel, 2023 . - 216 p.bibliographie
Doctoral thesis from Université Gustave Eiffel, Doctoral school MSTIC, Specialty "Geographic information sciences"Langues : Anglais (eng)Descripteur : [Termes IGN] généralisation automatique de données[Termes IGN] généralisation cartographique automatisée[Termes IGN] relation spatiale[Termes IGN] réseau antagoniste génératif[Termes IGN] réseau neuronal profond[Vedettes matières IGN] Généralisation Index. décimale : THESE Thèses et HDR Résumé : (auteur) Map generalization is a process that aims to adapt the level of detail of geographic information for cartography at a small scale. Automating the process is complex but essential in map production. We think this research field could benefit from the recent advances in deep learning that make it possible to solve more and more complex tasks, using numerous training examples. This thesis proposes exploring the potential of deep learning for map generalization. This exploration is built upon three map generalization use cases: recognition of spatial relations, graphic generalization of mountain roads, and generalization of topographic maps at medium scales. These three use cases enable us to address research questions relative to the concrete implementation of deep learning models for map generalization (including dataset creation and architecture), the evaluation of such models and their integration in existing generalization processes. In addition to the models and training set adapted for each of our case studies already mentioned, we propose evaluation methods adapted to the challenges of cartographic generalization by deep learning. Finally, we propose a partitioning of the cartographic generalization into sub-problems facilitating the resolution by learning and allowing the generation of generalized map images. Note de contenu : Introduction Part 1 A new paradigm for map generalization Chapter A. Literature review Chapter B. Formulating map generalization as a deep learning task Chapter C. Designing a framework for deep learning based map generalization Part 2 Exploration of deep learning for map generalization Chapter D. Can graph neural networks model spatial relations? Chapter E. CNN for the generalization of roads Chapter F. The generation of topographic map with several themes Part III The future of map generalization with deep learning Chapter G. Usages of deep learning models for map generalization Chapter H. Evaluation of deep learning predictions Conclusion Numéro de notice : 17752 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : GEOMATIQUE Nature : Thèse française Organisme de stage : LASTIG (IGN) nature-HAL : Thèse DOI : sans Date de publication en ligne : 05/05/2023 En ligne : https://theses.hal.science/tel-04089883v1 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103186 Field optical clocks and sensitivity to mass anomalies for geoscience applications (2023)
Field optical clocks and sensitivity to mass anomalies for geoscience applications [Article/Communication] / Guillaume Lion, Auteur ; Gwendoline Pajot-Métivier, Auteur ; Kristel Chanard, Auteur ; Michel Diament, Auteur . - Munich [Allemagne] : European Geosciences Union EGU, 2023.Langues : Anglais (eng)Descripteur : [Vedettes matières IGN] Géodésie spatiale[Termes IGN] analyse de sensibilité[Termes IGN] anomalie de pesanteur[Termes IGN] chronométrie[Termes IGN] horloge optique Index. décimale : 30.60 Géodésie spatiale Résumé : (auteur) 350 years ago, the pendulum clock for astronomical observations was diverted to become an instrument for measuring gravity. The measurement of the parallax of Mars by Richer and Cassini from Cayenne and Paris showed that the period of a periodic oscillator depends on the gravity field. A link was thus established between the improvement of time measurement and the knowledge of the phenomena that govern it. Since then, the performance and nature of clocks have evolved considerably. Today, atomic clocks are used in various fields that are essential to modern society, such as the realisation of international atomic time (TAI), satellite navigation (GNSS), geodesy, the traceability of trading events, etc. In the framework of the french ANR ROYMAGE, we are interested in the contribution of a transportable optical field clock for geoscience applications by using the principle of chronometric geodesy. The idea is based on the gravitational redshift, a relativistic effect that predicts that the beat of a clock depends on the speed at which it is moving and the strength of the surrounding gravitational potential. In practice, this means that if we compare the beat of two clocks, then it is possible to directly measure a difference in gravitational potential (or a change in height) between these two clocks. This type of measurement is original because classical geodetic techniques only allow to determine the potential indirectly from gravimetric and classical levelling data. In this work, we model the gravitational signature (potential, acceleration and tensor) of a mass anomaly as a function of its geometry, depth, size and density contrast. These synthetic simulations allow us to identify which types of structures can be detected by clock comparison measurements with a relative frequency uncertainty fixed at 10-17-18-19 (i.e. a vertical sensitivity of less than 10 cm - 1 cm - 1 mm respectively). We are also interested in the spatial resolution required for a clock measurement to detect two mass anomalies depending on its orientation. Finally, we show that this new chronometric observable combined with gravimetry and gradiometry data could allow a better separation of the sources by adding an additional constraint thanks to the medium and long wavelength gravitational information it provides. Numéro de notice : C2023-003 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Autre URL associée : vers HAL Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : 10.5194/egusphere-egu23-3646 En ligne : https://doi.org/10.5194/egusphere-egu23-3646 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103216 GENESIS: co-location of geodetic techniques in space
GENESIS: co-location of geodetic techniques in space [Article/Communication] / Pacôme Delva, Auteur ; Zuheir Altamimi, Auteur ; et al., Auteur ; Laurent Métivier, Auteur . - 2023 . - n° 5 (2023).bibliographie by Pacôme Delva, Zuheir Altamimi, Alejandro Blazquez, Mathis Blossfeld, Johannes Böhm, Pascal Bonnefond, Jean-Paul Boy, Sean Bruinsma, Grzegorz Bury, Miltiadis Chatzinikos, Alexandre Couhert, Clément Courde, Rolf Dach, Véronique Dehant, Simone Dell’Agnello, Gunnar Elgered, Werner Enderle, Pierre Exertier, Susanne Glaser, Rüdiger Haas, Wen Huang, Urs Hugentobler, Adrian Jäggi, Ozgur Karatekin, Frank G. Lemoine, Christophe Le Poncin-Lafitte, Susanne Lunz, Benjamin Männel, Flavien Mercier, Laurent Métivier, Benoît Meyssignac, Jürgen Müller, Axel Nothnagel, Felix Perosanz, Roelof Rietbroek, Markus Rothacher, Harald Schuh, Hakan Sert, Krzysztof Sosnica, Paride Testani, Javier Ventura-Traveset, Gilles Wautelet & Radoslaw Zajdel Langues : Anglais (eng)in Earth, Planets and Space > vol 75 n° 1 (2023) . - n° 5 (2023)Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux[Termes IGN] co-positionnement[Termes IGN] géodésie spatiale[Termes IGN] International Terrestrial Reference Frame[Termes IGN] précision du positionnement[Termes IGN] satellite de positionnement Résumé : (auteur) Improving and homogenizing time and space reference systems on Earth and, more specifically, realizing the Terrestrial Reference Frame (TRF) with an accuracy of 1 mm and a long-term stability of 0.1 mm/year are relevant for many scientific and societal endeavors. The knowledge of the TRF is fundamental for Earth and navigation sciences. For instance, quantifying sea level change strongly depends on an accurate determination of the geocenter motion but also of the positions of continental and island reference stations, such as those located at tide gauges, as well as the ground stations of tracking networks. Also, numerous applications in geophysics require absolute millimeter precision from the reference frame, as for example monitoring tectonic motion or crustal deformation, contributing to a better understanding of natural hazards. The TRF accuracy to be achieved represents the consensus of various authorities, including the International Association of Geodesy (IAG), which has enunciated geodesy requirements for Earth sciences. Moreover, the United Nations Resolution 69/266 states that the full societal benefits in developing satellite missions for positioning and Remote Sensing of the Earth are realized only if they are referenced to a common global geodetic reference frame at the national, regional and global levels. Today we are still far from these ambitious accuracy and stability goals for the realization of the TRF. However, a combination and co-location of all four space geodetic techniques on one satellite platform can significantly contribute to achieving these goals. This is the purpose of the GENESIS mission, a component of the FutureNAV program of the European Space Agency. The GENESIS platform will be a dynamic space geodetic observatory carrying all the geodetic instruments referenced to one another through carefully calibrated space ties. The co-location of the techniques in space will solve the inconsistencies and biases between the different geodetic techniques in order to reach the TRF accuracy and stability goals endorsed by the various international authorities and the scientific community. The purpose of this paper is to review the state-of-the-art and explain the benefits of the GENESIS mission in Earth sciences, navigation sciences and metrology. This paper has been written and supported by a large community of scientists from many countries and working in several different fields of science, ranging from geophysics and geodesy to time and frequency metrology, navigation and positioning. As it is explained throughout this paper, there is a very high scientific consensus that the GENESIS mission would deliver exemplary science and societal benefits across a multidisciplinary range of Navigation and Earth sciences applications, constituting a global infrastructure that is internationally agreed to be strongly desirable. Numéro de notice : A2023-078 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1186/s40623-022-01752-w Date de publication en ligne : 11/01/2023 En ligne : https://doi.org/10.1186/s40623-022-01752-w Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102519 Geographically masking addresses to study COVID-19 clusters
Geographically masking addresses to study COVID-19 clusters [Article/Communication] / Walid Houfaf-Khoufaf, Auteur ; Guillaume Touya, Auteur . - 2023.bibliographieLangues : Anglais (eng)in Cartography and Geographic Information Science > vol inconnu (2023)Descripteur : [Vedettes matières IGN] Géomatique[Termes IGN] adresse postale[Termes IGN] anonymisation[Termes IGN] carte sanitaire[Termes IGN] classification barycentrique[Termes IGN] surveillance sanitaire[Termes IGN] traitement de données localisées Résumé : (auteur) The spatio-temporal analysis of cases is a good way an epidemic, and the recent COVID-19 pandemic unfortunately generated a huge amount of data. But analysing this raw data, with for instance the address of the people who contracted COVID-19, raises some privacy issues, and geomasking is necessary to preserve both people privacy and the spatial accuracy required for analysis. This paper proposes dierent geomasking techniques adapted to this COVID-19 data. Methods: Different techniques are adapted from the literature, and tested on a synthetic dataset mimicking the COVID-19 spatio-temporal spreading in Paris and a more rural nearby region. Theses techniques are assessed in terms of k-anonymity and cluster preservation. Results: Three adapted geomasking techniques are proposed: aggregation, bimodal gaussian perturbation, and simulated crowding. All three can be useful in different use cases, but the bimodal gaussian perturbation is the overall best techniques, and the simulated crowding is the most promising one, provided some improvements are introduced to avoid points with a low k-anonymity. Conclusions: It is possible to use geomasking techniques on addresses of people who caught COVID-19, while preserving the important spatial patterns. Numéro de notice : A2023-084 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Autre URL associée : vers RSquare Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2021.1977709 Date de publication en ligne : 08/10/2021 En ligne : https://doi.org/10.1080/15230406.2021.1977709 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96857 GeoMultiTaskNet: remote sensing unsupervised domain adaptation using geographical coordinates (2023)
GeoMultiTaskNet: remote sensing unsupervised domain adaptation using geographical coordinates [Article/Communication] / Valerio Marsocci, Auteur ; Nicolas Gonthier, Auteur ; Anatol Garioud, Auteur ; Simone Scardapane, Auteur ; Clément Mallet, Auteur . - Ithaca [New York - Etats-Unis] : ArXiv - Université Cornell, 2023 . - 11 p. ; 21 x 30 cm.BibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Traitement d'image optique[Termes IGN] base de données d'occupation du sol[Termes IGN] image à très haute résolution[Termes IGN] jeu de données localisées[Termes IGN] métadonnées géographiques[Termes IGN] segmentation sémantique Résumé : (auteur) Land cover maps are a pivotal element in a wide range of Earth Observation (EO) applications. However, annotating large datasets to develop supervised systems for remote sensing (RS) semantic segmentation is costly and time-consuming. Unsupervised Domain Adaption (UDA) could tackle these issues by adapting a model trained on a source domain, where labels are available, to a target domain, without annotations. UDA, while gaining importance in computer vision, is still under-investigated in RS. Thus, we propose a new lightweight model, GeoMultiTaskNet, based on two contributions: a GeoMultiTask module (GeoMT), which utilizes geographical coordinates to align the source and target domains, and a Dynamic Class Sampling (DCS) strategy, to adapt the semantic segmentation loss to the frequency of classes. This approach is the first to use geographical metadata for UDA in semantic segmentation. It reaches state-of-the-art performances (47,22% mIoU), reducing at the same time the number of parameters (33M), on a subset of the FLAIR dataset, a recently proposed dataset properly shaped for RS UDA, used for the first time ever for research scopes here. Numéro de notice : C2023-004 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Autre URL associée : vers HAL Thématique : IMAGERIE Nature : Communication DOI : 10.48550/arXiv.2304.07750 En ligne : https://doi.org/10.48550/arXiv.2304.07750 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103083 Incorporating ideas of structure and meaning in interactive multi scale mapping environments
Incorporating ideas of structure and meaning in interactive multi scale mapping environments [Article/Communication] / Guillaume Touya, Auteur ; Quentin Potié, Auteur ; William A Mackaness, Auteur . - 2023.bibliographieLangues : Anglais (eng)in International journal of cartography > vol inconnu (2023)Descripteur : [Termes IGN] apprentissage automatique[Termes IGN] état de l'art[Termes IGN] généralisation cartographique automatisée[Termes IGN] lisibilité perceptive[Termes IGN] reconnaissance de formes[Termes IGN] web mapping[Vedettes matières IGN] Généralisation Résumé : (auteur) Web based, slippy, scalable maps are common place. Interacting with such digital maps at varying levels of detail is key to interpretation, and exploration of different geographies. The process of abstraction remains key to the immediate and successful interpretation of their many structures and geographical associations found at any given scale. Meaning is derived from such recognisable structures and map generalisation plays a critical role in communicating an entity's most characteristic and salient qualities. But what are these structures? How (and why) do they change over scale? Why are such questions relevant to automated mapping? In this paper we reflect on the value of perceptual studies and reconsider the context in which map generalisation now takes place. We review developments in pattern recognition techniques and the role played by machine learning techniques in identifying high level structures in abstracted maps. The benefits of their application include derivation of ontological descriptions of landscape, identification and preservation of salient landmarks across scales. We argue that a 'structuralist based approach' provides a more meaningful basis for measuring success and achieving more meaningful outputs. Ultimately the ambition is greater levels of automation in map generalisation, particularly in the context of web based solutions. Numéro de notice : A2023-099 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Autre URL associée : vers HAL Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/23729333.2023.2215960 Date de publication en ligne : 01/06/2023 En ligne : https://doi.org/10.1080/23729333.2023.2215960 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103273 Learnable Earth Parser: Discovering 3D Prototypes in Aerial Scans (2023)
Learnable Earth Parser: Discovering 3D Prototypes in Aerial Scans [Article/Communication] / Romain Loiseau, Auteur ; Elliot Vincent, Auteur ; Mathieu Aubry, Auteur ; Loïc Landrieu, Auteur . - Ithaca [New York - Etats-Unis] : ArXiv - Université Cornell, 2023 . - 18 p.bibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Lasergrammétrie[Termes IGN] données lidar[Termes IGN] données localisées 3D[Termes IGN] information complexe[Termes IGN] scène 3D[Termes IGN] semis de points[Termes IGN] zone urbaine Résumé : (auteur) We propose an unsupervised method for parsing large 3D scans of real-world scenes into interpretable parts. Our goal is to provide a practical tool for analyzing 3D scenes with unique characteristics in the context of aerial surveying and mapping, without relying on application-specific user annotations. Our approach is based on a probabilistic reconstruction model that decomposes an input 3D point cloud into a small set of learned prototypical shapes. Our model provides an interpretable reconstruction of complex scenes and leads to relevant instance and semantic segmentations. To demonstrate the usefulness of our results, we introduce a novel dataset of seven diverse aerial LiDAR scans. We show that our method outperforms state-of-the-art unsupervised methods in terms of decomposition accuracy while remaining visually interpretable. Our method offers significant advantage over existing approaches, as it does not require any manual annotations, making it a practical and efficient tool for 3D scene analysis. Our code and dataset are available at https://imagine.enpc.fr/~loiseaur/learnable-earth-parser Numéro de notice : P2023-005 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : IMAGERIE/INFORMATIQUE Nature : Preprint nature-HAL : Préprint DOI : sans En ligne : https://hal.science/hal-04135416 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103347 Missing the city for buildings? A critical review of pan-scalar map generalization and design in contemporary zoomable maps [Article/Communication] / Maieul Gruget, Auteur ; Guillaume Touya, Auteur ; Ian Muehlenhaus, Auteur . - 2023.bibliographieLangues : Anglais (eng)in International journal of cartography > vol inconnu (2023)Descripteur : [Termes IGN] carte interactive[Termes IGN] conception cartographique[Termes IGN] visualisation multiéchelle[Vedettes matières IGN] Généralisation Résumé : (auteur) Most of the maps used today are what we call pan-scalar maps, i.e. interactive zoomable applications comprised of numerous maps of a particular area at different zoom levels (i.e. scales). We argue that such maps require a pan-scalar map design, which may differ significantly from established map design axioms and standards. This review is twofold. First, it reviews current practices in pan-scalar map design. Second, it summarizes and synthesizes literature about pan-scalar map design, as well as human-computer interaction (HCI) best practices for pan-scalar maps. The review of practices is based on a ScaleMaster analysis of the design of three popular pan-scalar maps: Google Maps, OpenStreetMap, and France's IGN Classic. Discussion centers on both stellar and subpar contemporary pan-scalar map design practices to help guide future practical pan-scalar designs and research on pan-scalar maps broadly. Numéro de notice : A2023-077 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/23729333.2022.2153467 Date de publication en ligne : 10/01/2023 En ligne : https://doi.org/10.1080/23729333.2022.2153467 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102515 Mobile mapping mesh change detection and update (2023)
Mobile mapping mesh change detection and update [Article/Communication] / Teng Wu, Auteur ; Bruno Vallet, Auteur ; Cédric Demonceaux, Auteur . - Ithaca [New York - Etats-Unis] : ArXiv - Université Cornell, 2023 . - 7 p. ; 21 x 30 cm.bibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Lasergrammétrie[Termes IGN] détection de changement[Termes IGN] données lidar[Termes IGN] données localisées 3D[Termes IGN] maillage par triangles[Termes IGN] mosaïquage d'images[Termes IGN] semis de points[Termes IGN] série temporelle[Termes IGN] Stéréopolis[Termes IGN] système de numérisation mobile[Termes IGN] vision par ordinateur Résumé : (auteur) Mobile mapping, in particular, Mobile Lidar Scanning (MLS) is increasingly widespread to monitor and map urban scenes at city scale with unprecedented resolution and accuracy. The resulting point cloud sampling of the scene geometry can be meshed in order to create a continuous representation for different applications: visualization, simu- lation, navigation, etc. Because of the highly dynamic nature of these urban scenes, long term mapping should rely on frequent map updates. A trivial solution is to simply replace old data with newer data each time a new acquisition is made. However it has two drawbacks: 1) the old data may be of higher quality (resolution, precision) than the new and 2) the coverage of the scene might be different in various acquisitions, including varying occlusions. In this paper, we propose a fully automatic pipeline to address these two issues by formulating the problem of merging meshes with different quality, coverage and acquisition time. Our method is based on a combined distance and visibility based change detection, a time series analysis to assess the sustainability of changes, a mesh mosaicking based on a global boolean optimization and finally a stitching of the resulting mesh pieces boundaries with triangle strips. Finally, our method is demonstrated on Robotcar and Stereopolis datasets. Numéro de notice : P2023-003 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : IMAGERIE Nature : Preprint nature-HAL : Préprint DOI : 10.48550/arXiv.2303.07182 Date de publication en ligne : 13/03/2023 En ligne : https://doi.org/10.48550/arXiv.2303.07182 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102860 Modèles et outils pour la publication de métadonnées d'archives géographiques et de leurs données dérivées [Article/Communication] / Melvin Hersent, Auteur ; Nathalie Abadie, Auteur ; Bertrand Duménieu, Auteur ; Julien Perret, Auteur . - Paris : HAL, 2023 . - 7 p. ; 21 x 30 cm.bibliographieLangues : Français (fre)Descripteur : [Vedettes matières IGN] Géomatique web[Termes IGN] échange dynamique de données[Termes IGN] interopérabilité sémantique[Termes IGN] métadonnées[Termes IGN] métadonnées géographiques[Termes IGN] norme ISO[Termes IGN] terminologie Index. décimale : 37.50 Géomatique web Résumé : (auteur) L'interopérabilité des données dans un projet pluridisciplinaire est primordiale. Prenant l'exemple d'un projet de recherche en histoire spatiale, nous comparerons dans un premier temps les standards et vocabulaires à notre disposition pour décrire des données géographiques et des documents d'archives. Nous proposons ensuite un alignement entre les standards retenus : l'ISO 19115 et RiC-O. Enfin, nous proposons une architecture de microservices pour la saisie, le stockage, la publication sur le Web et l'interrogation unifiée des métadonnées de nos sources. Numéro de notice : C2023-005 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://hal.science/hal-04110787 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103274 Modern vectorization and alignment of historical maps: An application to Paris Atlas (1789-1950) = Vectorisation et alignement modernes des cartes historiques : Une application à l'Atlas de Paris (1789-1950) [Thèse/HDR] / Yizi Chen, Auteur ; Julien Perret, Directeur de thèse ; Joseph Chazalon, Directeur de thèse ; Clément Mallet, Directeur de thèse . - Champs-sur-Marne [France] : Université Gustave Eiffel, 2023 . - 124 p. ; 21 x 30 cm.bibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Traitement d'image optique[Termes IGN] alignement des données[Termes IGN] apprentissage profond[Termes IGN] carte ancienne[Termes IGN] classification par réseau neuronal convolutif[Termes IGN] contraste local[Termes IGN] extraction automatique[Termes IGN] jeu de données localisées[Termes IGN] morphologie mathématique[Termes IGN] Paris (75)[Termes IGN] plan de ville[Termes IGN] reconnaissance de formes[Termes IGN] vectorisation[Termes IGN] vision par ordinateur Index. décimale : THESE Thèses et HDR Résumé : (auteur) Les cartes sont une source unique de connaissances depuis des siècles. Ces documents historiques fournissent des informations inestimables pour analyser des transformations spatiales complexes sur des périodes importantes. Cela est particulièrement vrai pour les zones urbaines qui englobent de multiples domaines de recherche imbriqués : humanités, sciences sociales, etc. La complexité des cartes (texte, bruit, artefacts de numérisation, etc.) a entravé la capacité à proposer des approches de vectorisation polyvalentes et efficaces pendant des décennies. Dans cette thèse, nous proposons une solution apprenable, reproductible et réutilisable pour la transformation automatique de cartes raster en objets vectoriels (îlots, rues, rivières), en nous focalisant sur le problème d'extraction de formes closes. Notre approche s'appuie sur la complémentarité des réseaux de neurones convolutifs qui excellent dans et de la morphologie mathématique, qui présente de solides garanties au regard de l'extraction de formes closes tout en étant très sensible au bruit. Afin d'améliorer la robustesse au bruit des filtres convolutifs, nous comparons plusieurs fonctions de coût visant spécifiquement à préserver les propriétés topologiques des résultats, et en proposons de nouvelles. À cette fin, nous introduisons également un nouveau type de couche convolutive (CConv) exploitant le contraste des images, pour explorer les possibilités de telles améliorations à l'aide de transformations architecturales des réseaux. Finalement, nous comparons les différentes approches et architectures qui peuvent être utilisées pour implémenter chaque étape de notre chaîne de traitements, et comment combiner ces dernières de la meilleure façon possible. Grâce à une chaîne de traitement fonctionnelle, nous proposons une nouvelle procédure d'alignement d'images de plans historiques, et commençons à tirer profit de la redondance des données extraites dans des images similaires pour propager des annotations, améliorer la qualité de la vectorisation, et éventuellement détecter des cas d'évolution en vue d'analyse thématique, ou encore l'estimation automatique de la qualité de la vectorisation. Afin d'évaluer la performance des méthodes mentionnées précédemment, nous avons publié un nouveau jeu de données composé d'images de plans historiques annotées. C'est le premier jeu de données en libre accès dédié à la vectorisation de plans historiques. Nous espérons qu'au travers de nos publications, et de la diffusion ouverte et publique de nos résultats, sources et jeux de données, cette recherche pourra être utile à un large éventail d'applications liées aux cartes historiques. Note de contenu : 1- Introduction 2- Pipeline design for historical map vectorization 3- Learning edges through deep neural architectures 4- Topology-aware loss functions 5- Improving model robustness of deep edge detectors 6- Leveraging redundancies of historical maps 7- Conclusion and perspectives Numéro de notice : 10713 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : IMAGERIE/INFORMATIQUE Nature : Thèse française Note de thèse : thèse de doctorat : Sciences géographiques : UGE : 2023 Organisme de stage : LASTIG (IGN) nature-HAL : Thèse DOI : sans En ligne : https://theses.hal.science/tel-04106107 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103264 Pointless global bundle adjustment with relative motions Hessians (2023)
Pointless global bundle adjustment with relative motions Hessians [Article/Communication] / Ewelina Rupnik, Auteur ; Marc Pierrot-Deseilligny, Auteur . - Computer vision foundation CVF, 2023 . - pp 6517 - 6525.bibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Photogrammétrie numérique[Termes IGN] compensation par faisceaux[Termes IGN] estimation de pose[Termes IGN] matrice Index. décimale : 33.30 Photogrammétrie numérique Résumé : (auteur) Bundle adjustment (BA) is the standard way to optimise camera poses and to produce sparse representations of a scene. However, as the number of camera poses and features grows, refinement through bundle adjustment becomes inefficient. Inspired by global motion averaging methods, we propose a new bundle adjustment objective which does not rely on image features' reprojection errors yet maintains precision on par with classical BA. Our method averages over relative motions while implicitly incorporating the contribution of the structure in the adjustment. To that end, we weight the objective function by local hessian matrices-a by-product of local bundle adjustments performed on relative motions (eg, pairs or triplets) during the pose initialisation step. Such hessians are extremely rich as they encapsulate both the features' random errors and the geometric configuration between the cameras. These pieces of information propagated to the global frame help to guide the final optimisation in a more rigorous way. We argue that this approach is an upgraded version of the motion averaging approach and demonstrate its effectiveness on both photogrammetric datasets and computer vision benchmarks. Numéro de notice : C2023-008 Affiliation des auteurs : UGE-LASTIG (2020- ) Autre URL associée : vers OA paper Thématique : IMAGERIE/INFORMATIQUE/MATHEMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://openaccess.thecvf.com/content/CVPR2023W/PCV/papers/Rupnik_Pointless_Glob [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103282 Precipitation frequency in Med-CORDEX and EURO-CORDEX ensembles from 0.44° to convection-permitting resolution: impact of model resolution and convection representation [Article/Communication] / Minh Ha-Truong, Auteur ; Sophie Bastin, Auteur ; Philippe Drobinski, Auteur ; Lluis Fita, Auteur ; Jan Polcher, Auteur ; Olivier Bock, Auteur ; et al., Auteur . - 2023.bibliographie All authors gratefully acknowledge the WCRP-CORDEX-FPS on Convective phenomena at high resolution over Europe and the Mediterranean (FPSCONVALP- 3) and the research data exchange infrastructure and services provided by the Jülich Supercomputing Centre, Germany, as part of the Helmholtz Data Federation initiative. To process the data, this study benefited from the IPSL mesocenter ESPRI facility which is supported by CNRS, UPMC, Labex L-IPSL, CNES and EcolePolytechnique, and received funding from the HORIZON 2020 EUCP (European Climate Prediction System) project (https://www.eucp-project.eu, grant agreement No. 776613).Langues : Anglais (eng)in Climate Dynamics > vol 60 n° inconnu (2023)Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale[Termes IGN] bassin méditerranéen[Termes IGN] convection[Termes IGN] données météorologiques[Termes IGN] Europe (géographie politique)[Termes IGN] modèle atmosphérique[Termes IGN] orographie[Termes IGN] précipitation[Termes IGN] teneur intégrée en vapeur d'eau Résumé : (auteur) Recent studies using convection-permitting (CP) climate simulations have demonstrated a step-change in the representation of heavy rainfall and rainfall characteristics (frequency-intensity) compared to coarser resolution Global and Regional climate models. The goal of this study is to better understand what explains the weaker frequency of precipitation in the CP ensemble by assessing the triggering process of precipitation in the different ensembles of regional climate simulations available over Europe. We focus on the statistical relationship between tropospheric temperature, humidity and precipitation to understand how the frequency of precipitation over Europe and the Mediterranean is impacted by model resolution and the representation of convection (parameterized vs. explicit). We employ a multi-model data-set with three different resolutions (0.44°, 0.11° and 0.0275°) produced in the context of the MED-CORDEX, EURO-CORDEX and the CORDEX Flagship Pilot Study "Convective Phenomena over Europe and the Mediterranean" (FPSCONV). The multi-variate approach is applied to all model ensembles, and to several surface stations where the integrated water vapor (IWV) is derived from Global Positioning System (GPS) measurements. The results show that all model ensembles capture the temperature dependence of the critical value of IWV (IWVcv), above which an increase in precipitation frequency occurs, but the differences between the models in terms of the value of IWVcv, and the probability of its being exceeded, can be large at higher temperatures. The lower frequency of precipitation in convection-permitting simulations is not only explained by higher temperatures but also by a higher IWVcv necessary to trigger precipitation at similar temperatures, and a lower probability to exceed this critical value. The spread between models in simulating IWVcv and the probability of exceeding IWVcv is reduced over land in the ensemble of models with explicit convection, especially at high temperatures, when the convective fraction of total precipitation becomes more important and the influence of the representation of entrainment in models thus becomes more important. Over lowlands, both model resolution and convection representation affect precipitation triggering while over mountainous areas, resolution has the highest impact due to orography-induced triggering processes. Over the sea, since lifting is produced by large-scale convergence, the probability to exceed IWVcv does not depend on temperature, and the model resolution does not have a clear impact on the results. Numéro de notice : A2023-072 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00382-022-06594-6 Date de publication en ligne : 29/12/2022 En ligne : https://doi.org/10.1007/s00382-022-06594-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102360 PSMNet-FusionX3 : LiDAR-guided deep learning stereo dense matching on aerial images (2023)
PSMNet-FusionX3 : LiDAR-guided deep learning stereo dense matching on aerial images [Article/Communication] / Teng Wu, Auteur ; Bruno Vallet, Auteur ; Marc Pierrot-Deseilligny, Auteur . - Computer vision foundation CVF, 2023 . - pp 6526 - 6535.bibliographie voir aussi https://openaccess.thecvf.com/content/CVPR2023W/PCV/supplemental/Wu_PSMNet-FusionX3_LiDAR-Guided_Deep_CVPRW_2023_supplemental.pdfLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Applications photogrammétriques[Termes IGN] appariement dense[Termes IGN] apprentissage profond[Termes IGN] chaîne de traitement[Termes IGN] données lidar[Termes IGN] données localisées 3D[Termes IGN] image aérienne à axe vertical[Termes IGN] scène 3D[Termes IGN] Triangulated Irregular Network Résumé : (auteur) Dense image matching (DIM) and LiDAR are two complementary techniques for recovering the 3D geometry of real scenes. While DIM provides dense surfaces, they are often noisy and contaminated with outliers. Conversely, LiDAR is more accurate and robust, but less dense and more expensive compared to DIM. In this work, we investigate learning-based methods to refine surfaces produced by photogrammetry with sparse LiDAR point clouds. Unlike the current state-of-the-art approaches in the computer vision community, our focus is on aerial acquisitions typical in photogrammetry. We propose a densification pipeline that adopts a PSMNet backbone with triangulated irregular network interpolation based expansion, feature enhancement in cost volume, and conditional cost volume normalization, i.e. PSMNet-FusionX3. Our method works better on low density and is less sensitive to distribution, demonstrating its effectiveness across a range of LiDAR point cloud densities and distributions, including analyses of dataset shifts. Furthermore, we have made both our aerial (image and disparity) dataset and code available for public use. Further information can be found at https://github.com/ whuwuteng/PSMNet-FusionX3. Numéro de notice : C2023-006 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : IMAGERIE/INFORMATIQUE Nature : Communication DOI : sans En ligne : https://openaccess.thecvf.com/content/CVPR2023W/PCV/papers/Wu_PSMNet-FusionX3_Li [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103277 Semi-automated Pipeline to Produce Customizable Tactile Maps of Street Intersections for People with Visual Impairments [Article/Communication] / Yuhao Jiang, Auteur ; María-Jesús Lobo, Auteur ; Sidonie Christophe, Auteur ; Christophe Jouffrais, Auteur . - Göttingen : Copernicus publications, 2023 . - n° 29 ; 8 p.. - (AGILE GIScience Series; 4) .bibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Cartographie[Termes IGN] carrefour[Termes IGN] carte sur mesure[Termes IGN] carte tactile[Termes IGN] chaîne de traitement[Termes IGN] OpenStreetMap[Termes IGN] personne malvoyante Index. décimale : 39.00 Cartographie - généralités - Cartologie Résumé : (auteur) Street intersections are very challenging for people with visual impairments. Manually produced tactile maps are an important support in teaching and assisting independent journeys as they can be customized to serve the visually impaired audience with diverse tactile reading and mobility skills in different use scenarios. But the manual map production involves a huge workload that makes the maps less accessible. This paper explores the possibility of semi-automatically producing customizable tactile maps for street intersections. It presents a parameterized semi-automated pipeline based on OSM data that allows the maps to be customized in size, map features, geometry processing choices, and symbolizations. It produces street intersection maps in two scales of three sizes, with different levels of details and styles. Numéro de notice : C2023-013 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/agile-giss-4-29-2023 Date de publication en ligne : 06/06/2023 En ligne : https://doi.org/10.5194/agile-giss-4-29-2023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103307 Structured learning of geospatial data (2023)
Structured learning of geospatial data [Thèse/HDR] / Loïc Landrieu, Auteur . - Champs-sur-Marne [France] : Université Gustave Eiffel, 2023 . - 179 p. ; 21 x 30 cm.Bibliographie Habilitation à Diriger des Recherches délivrée par l'Université Gustave Eiffel, Spécialité "Sciences et Technologies de l'Information Géographique" Langues : Anglais (eng)Descripteur : [Vedettes matières IGN] Traitement d'image optique[Termes IGN] algorithme Cut Pursuit[Termes IGN] apprentissage automatique[Termes IGN] carte agricole[Termes IGN] graphe[Termes IGN] lasergrammétrie[Termes IGN] reconnaissance de formes[Termes IGN] segmentation sémantique[Termes IGN] série temporelle[Termes IGN] vision par ordinateur Résumé : (auteur) This manuscript presents an overview of my work in the field of geospatial machine learning, a rapidly growing interdisciplinary field that poses many methodological challenges and has a wide range of impactful applications. Throughout my research, I have focused on developing bespoke approaches that leverage the unique properties of geospatial data to create more efficient, precise, and parsimonious models. This manuscript is divided into four main chapters, each covering a different property of geospatial data structures that can be leveraged algorithmically. The first chapter presents a versatile mathematical framework formalizing the concept of spatial regularity with graphs. We propose an efficient algorithm that tackles a broad family of spatial problems and provides novel convergence guarantees and significant speed-ups compared to generic approaches. The second chapter introduces a deep learning method that extends the idea of exploiting graph regularity to the case of massive 3D point clouds. We simplify the task of large-scale semantic segmentation by formulating it as as a small graph labelling problem. Our compact models reach high precision at a fraction of the computational cost of other approaches. In the third chapter, we present a collection of methods designed to take advantage of the data structure inherited from 3D sensors. By considering the sensors’ structure, we develop powerful networks with state-of-the-art accuracy, latency, and robustness for various applications and data types. The last chapter dives into the real-life challenge of automated satellite time series analysis for crop mapping. Recognizing the difference between such data and standard formats used in computer vision, we propose novel and streamlined architectures that achieve unprecedented precision while remaining efficient and economical in memory and preprocessing. We also introduce the task of panoptic segmentation for satellite time series and an efficient architecture to solve this problem at scale. In summary, this manuscript argues that geospatial problems represent a challenging and impactful venue for evaluating the newest machine learning and vision methods and a fertile source of inspiration for designing novel approaches. Note de contenu : 1- Introduction 2- Exploiting graph regularity 3- Exploiting the spatial regularity of 3D data 4- Exploiting the structure of 3D sensors 5- Exploiting the structure of satellite time series 6- Perspectives 7- Curriculum vitae Numéro de notice : 24107 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : IMAGERIE Nature : HDR Note de thèse : HDR: Sciences et Technologies de l’Information Geographique : UGE : 2023 Organisme de stage : LASTIG (IGN) DOI : sans En ligne : https://hal.science/tel-04095452v1 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103248 A survey and benchmark of automatic surface reconstruction from point clouds (2023)
A survey and benchmark of automatic surface reconstruction from point clouds [Article/Communication] / Raphaël Sulzer, Auteur ; Loïc Landrieu, Auteur ; Renaud Marlet, Auteur ; Bruno Vallet, Auteur . - Ithaca [New York - Etats-Unis] : ArXiv - Université Cornell, 2023 . - 24 p.bibliographieLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Traitement d'image[Termes IGN] benchmark spatial[Termes IGN] données d'entrainement (apprentissage automatique)[Termes IGN] données lidar[Termes IGN] données localisées 3D[Termes IGN] reconstruction d'objet[Termes IGN] semis de points Résumé : (auteur) We survey and benchmark traditional and novel learning-based algorithms that address the problem of surface reconstruction from point clouds. Surface reconstruction from point clouds is particularly challenging when applied to real-world acquisitions, due to noise, outliers, non-uniform sampling and missing data. Traditionally, different handcrafted priors of the input points or the output surface have been proposed to make the problem more tractable. However, hyperparameter tuning for adjusting priors to different acquisition defects can be a tedious task. To this end, the deep learning community has recently addressed the surface reconstruction problem. In contrast to traditional approaches, deep surface reconstruction methods can learn priors directly from a training set of point clouds and corresponding true surfaces. In our survey, we detail how different handcrafted and learned priors affect the robustness of methods to defect-laden input and their capability to generate geometric and topologically accurate reconstructions. In our benchmark, we evaluate the reconstructions of several traditional and learning-based methods on the same grounds. We show that learning-based methods can generalize to unseen shape categories, but their training and test sets must share the same point cloud characteristics. We also provide the code and data to compete in our benchmark and to further stimulate the development of learning-based surface reconstruction: https://github.com/raphaelsulzer/dsr-benchmark. Numéro de notice : P2023-004 Affiliation des auteurs : UGE-LASTIG+Ext (2020- ) Autre URL associée : vers ArXiv Thématique : IMAGERIE/INFORMATIQUE Nature : Preprint nature-HAL : Préprint DOI : 10.48550/arXiv.2301.13656 Date de publication en ligne : 31/01/2023 En ligne : https://hal.science/hal-03968453 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102847 Tree diversity and identity modulate the growth response of thermophilous deciduous forests to climate warming [Article/Communication] / Giovanni Jacopetti, Auteur ; Federico Selvi, Auteur ; Filippo Bussotti, Auteur ; Martina Pollastrini, Auteur ; Tommaso Jucker, Auteur ; Olivier Bouriaud, Auteur . - 2023 . - n ° e08875.bibliographie The research leading to these results received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant 265171.Langues : Anglais (eng)in Oikos > vol 2023 n° inconnu (2023) . - n ° e08875Descripteur : [Termes IGN] cerne[Termes IGN] croissance des arbres[Termes IGN] forêt de feuillus[Termes IGN] forêt thermophile[Termes IGN] inventaire forestier étranger (données)[Termes IGN] Italie[Termes IGN] richesse floristique[Termes IGN] sécheresse[Termes IGN] température au sol[Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) Tree diversity and species identity are known to play an important role in modulating forest productivity and its capacity to buffer the effects of climatic events. The FunDivEurope exploratory platform allowed us to analyse this modulating effect in a medium-term time span, after an abrupt rise to a new stable level of the average summer temperature of ca 2°C, in Mediterranean forests in central Italy. This paper aims to answer the following questions: 1) did increasing temperature and drought events affect the growth of thermophilous deciduous forests? 2) Was this effect buffered in mixed stands compared to monocultures? 3) Did co-occurring tree species with different ecological characteristics, from more mesophilous to more xerophilous, have different responses? In 2012 and 2017, wood cores were collected from 659 trees in 36 plots representative of thermophilous deciduous forests. The selected tree species were Castanea sativa, Ostrya carpinifolia, Quercus cerris, Quercus ilex and Quercus petraea. In the sampling plots, they were present in pure stands and mixtures from two to four species. After measuring annual rings on cores, chronologies of basal area increment were built, and inventory data were used to estimate tree growth. Results showed a strong reduction of growth, lasting at least 18 years, after the temperature rise. Tree diversity significantly reduced the growth drop after the sudden and stable rise in summer average temperature. Tree mixture effect on growth stability appeared to be dependent on the tree species present in the mixture. Temperature rise and associated drought events, even without changes in rainfall, are one of the main challenges that European forests will face in the current scenarios of climate change. Tree diversity can buffer the effects of climate change over periods of at least 15 years and should be considered in forest management plans. Numéro de notice : A2023-070 Affiliation des auteurs : LIF+Ext (2020- ) Autre URL associée : archives Univ Florence Thématique : BIODIVERSITE/FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/oik.08875 Date de publication en ligne : 22/12/2022 En ligne : https://doi.org/10.1111/oik.08875 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102324 Vers une optimisation de la diffusion de l’information dans une ville intelligente (2023)
Vers une optimisation de la diffusion de l’information dans une ville intelligente [Article/Communication] / Malika Grim-Yefsah, Auteur ; Mohamed Chachoua, Auteur ; Léa Jeantet, Auteur . - La Rochelle : Université de La Rochelle, 2023 . - pp 79 - 84.bibliographieLangues : Français (fre)Descripteur : [Vedettes matières IGN] Analyse spatiale[Termes IGN] diffusion de l'information[Termes IGN] temps réel[Termes IGN] ville intelligente[Termes IGN] zone urbaine Index. décimale : 37.20 Analyse spatiale et ses outils Résumé : (auteur) Les panneaux d'affichage numérique introduisent Internet dans les espaces publics et simplifient la diffusion de l'information dans les environnements urbains. Avec l’avènement de la ville intelligente, en plus de la diffusion publicitaire, ces panneaux offrent des opportunités pour la gestion de l'information en temps réel et pour développer des applications innovantes. Cet article explore la problématique du positionnement de ces panneaux dans l'espace urbain et propose une approche basée sur les représentations spatiales pour déterminer les points d'installation optimaux, leur permettant d’assurer de nouvelles fonctions, selon le lieu. Numéro de notice : C2023-014 Affiliation des auteurs : ENSG+Ext (2020- ) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésNat DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103327 Where do people look at during multi-scale map tasks? (2023)
Where do people look at during multi-scale map tasks? [Article/Communication] / Laura Wenclik, Auteur ; Guillaume Touya, Auteur . - Göttingen : Copernicus publications, 2023 . - n° 51; 7 p.. - (AGILE GIScience Series; vol 4) .BibliographieLangues : Anglais (eng)Descripteur : [Termes IGN] carte interactive[Termes IGN] oculométrie[Termes IGN] point de repère[Termes IGN] translation[Termes IGN] visualisation multiéchelle[Termes IGN] zoom[Vedettes matières IGN] Géovisualisation Résumé : (Auteur) In order to design better pan-scalar maps, i.e. interactive, zoomable, multi-scale maps, we need to understand how they are perceived, understood, processed, manipulated by the users. This paper reports an experiment that uses an eye-tracker to analyse the gaze behaviour of users zooming and panning into a pan-scalar map. The gaze data from the experiment shows how people look at landmarks to locate the new map view after a zoom. We also identified different types of behaviours during a zoom when people stare at the mouse cursor, or during a pan where the gaze follows a landmark while the map translates. Numéro de notice : C2023-009 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/agile-giss-4-51-2023 Date de publication en ligne : 06/06/2023 En ligne : https://doi.org/10.5194/agile-giss-4-51-2023 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103303
