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Bulletins thématiques

Ces 4 bulletins sont construits à partir du catalogue du centre. Ils présentent les références des derniers documents et d'articles saisis dans le catalogue sur une période donnée.

Ces bulletins sont destinés à toutes celles et tous ceux qui désirent suivre l'actualité dans les grands domaines d'enseignement et de recherche de l'Institut national de l'information géographique et forestière (IGN).

Les bulletins sont placés par ordre alphabétique de nom. A l'intérieur de chaque bulletin, il est possible de modifier l'ordre d'apparition des références en cliquant sur le titre du bulletin puis sur le carré A-Z.

Vous pouvez demander à recevoir un ou plusieurs de ces bulletins dès leur parution en adressant un courriel à cdos at ign.fr

Bulletin-forêt

Forest age and topographic position jointly shape the species richness and composition of vascular plants in karstic habitats / Zoltán Bátori in Annals of Forest Science, vol 80 n° 1 (2023)

Public

[article]
inAnnals of Forest Science > vol 80 n° 1 (2023) . - n° 16

Titre :	Forest age and topographic position jointly shape the species richness and composition of vascular plants in karstic habitats
Type de document :	Article/Communication
Auteurs :	Zoltán Bátori, Auteur ; Csaba Tölgyesi, Auteur ; Gábor Li, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	n° 16
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] âge du peuplement forestier [Termes IGN] changement climatique [Termes IGN] gestion forestière [Termes IGN] habitat d'espèce [Termes IGN] karst [Termes IGN] pente [Termes IGN] topographie locale [Termes IGN] Tracheophyta [Vedettes matières IGN] Sylviculture
Résumé :	(auteur) Key message: Dolines may provide important safe havens for many plant species and play a key role in maintaining biodiversity. The combined effects of forest age and topographic position influence the biodiversity patterns of these unique habitats. Forest managers, conservationists, and researchers need to work together in order to maintain the species richness and composition of these habitats under environmental changes. Context: Dolines are the most prominent geomorphological features in many karst landscapes that may provide important microhabitats for many species. Aims: We aim to contribute to a better understanding of how forest age and topographic position influence the plant species richness and composition of vascular plants within doline habitats. Methods: We studied the effects of forest age (four age classes: from 5- to 10-year-old stands to more than 90-year-old stands), topographic position (south-facing slope, bottom, and north-facing slope), and their interaction on the distribution of vascular plants and mean Ellenberg indicator values in dolines using detrended correspondence analysis and mixed-effects models. Diagnostic species for the forest age classes and topographic positions were also determined. Results: Different groups of vascular plant species usually showed significant preferences for certain topographic positions and/or forest age classes in dolines. In general, the number of species in all studied groups of plants increased after a few years of canopy removal. The number of plant species in almost all groups was lowest in dolines covered with 40–45-year-old forests. The moist and nutrient-rich doline bottoms covered with 90–120-year-old forests harboured many climate change vulnerable plant species. Conclusions: Forest age and topographic position considerably influence the species richness and composition of vascular plants in dolines; therefore, forest managers and conservationists need to consider their potential impacts when evaluating the effects of climate warming on karst landscapes.
Numéro de notice :	A2023-188
Affiliation des auteurs :	non IGN
Thématique :	BIODIVERSITE/FORET
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1186/s13595-023-01183-x
Date de publication en ligne :	31/03/2023
En ligne :	https://doi.org/10.1186/s13595-023-01183-x
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=102967

Mapping territorial vulnerability to wildfires: A participative multi-criteria analysis / Miguel Rivière in Forest ecology and management, vol 539 (July-1 2023)

Developing alternatives to adaptive silviculture: Thinning and tree growth resistance to drought in a Pinus species on an elevated gradient in Southern Spain / Rafael M. Navarro-Cerrillo in Forest ecology and management, vol 537 (June-1 2023)

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[article]
inForest ecology and management > vol 537 (June-1 2023) . - n° 120936

Titre :	Developing alternatives to adaptive silviculture: Thinning and tree growth resistance to drought in a Pinus species on an elevated gradient in Southern Spain
Type de document :	Article/Communication
Auteurs :	Rafael M. Navarro-Cerrillo, Auteur ; Antonio M. Cachinero-Vivar, Auteur ; Óscar Pérez-Priego, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	n° 120936
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] croissance des arbres [Termes IGN] dendroécologie [Termes IGN] éclaircie (sylviculture) [Termes IGN] Espagne [Termes IGN] gestion forestière adaptative [Termes IGN] Pinus (genre) [Termes IGN] régénération (sylviculture) [Termes IGN] sécheresse [Vedettes matières IGN] Sylviculture
Résumé :	(auteur) Forest plantations are more vulnerable to the stress induced by biotic and abiotic factors than are naturally regenerated forests. These effects can be aggravated by a lack of management in large reforestation areas, and thinning could, therefore, help trees to reduce dieback and tree mortality related to drought. We address this question using a dendrochronology and modelling approach to improve the understanding of the growth response of high-density planted pine forests to thinning in drought-prone areas of Southern Spain. An experimental trial was, therefore, carried out with three species (Pinus halepensis, P. nigra, and P. sylvestris) and three thinning treatments (unthinned, moderate, and heavy thinning), after which growth-climate relationships and drought vulnerability indices were assessed. Three separate generalized linear mixed-effects models (GLMM), one for each species and location, were fitted using BAI as the response variable, and post-thinning growth trajectories and drought vulnerability indices were also simulated. Ten-year basal area showed strong growth responses following the thinning treatment (BAI10, 72% for P. halepensis and 50% for P. sylvestris as regards heavy thinning and 51% for P. nigra as regards moderate thinning), with different responses to precipitation and temperature according to species and thinning intensity. The significant effects of thinning on drought vulnerability indices indicated that the thinning treatments had a positive effect, irrespective of the pine species, although this was more evident in the case of P. sylvestris (recovery F = 28.10, p
Numéro de notice :	A2023-198
Affiliation des auteurs :	non IGN
Thématique :	FORET
Nature :	Article
DOI :	10.1016/j.foreco.2023.120936
Date de publication en ligne :	28/03/2023
En ligne :	https://doi.org/10.1016/j.foreco.2023.120936
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103086

Sweet chestnut forests under black locust invasion threat and different management: An assessment of stand structure and biodiversity / Thomas Campagnaro in Forest ecology and management, vol 537 (June-1 2023)

Public

[article]
inForest ecology and management > vol 537 (June-1 2023) . - n° 120907

Titre :	Sweet chestnut forests under black locust invasion threat and different management: An assessment of stand structure and biodiversity
Type de document :	Article/Communication
Auteurs :	Thomas Campagnaro, Auteur ; Giovanni Trentanovi, Auteur ; Simone Lacopino, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	n° 120907
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] Castanea sativa [Termes IGN] forêt méditerranéenne [Termes IGN] gestion forestière [Termes IGN] insecte nuisible [Termes IGN] Italie [Termes IGN] orthoptère [Termes IGN] Robinia pseudoacacia [Vedettes matières IGN] Sylviculture
Résumé :	(auteur) Sweet chestnut forests in Europe are impacted by management abandonment, non-native species invasions and diseases, among other factors. Understanding the effects of these factors is crucial for forecasting future biodiversity changes, as well as proposing appropriate planning and management strategies. We studied sweet chestnut (Castanea sativa Mill.) and black locust (Robinia pseudoacacia L.) dominated forests within three hilly landscapes (Euganean hills, Montello, and Berici hills) of north-eastern Italy. We surveyed 25 paired sweet chestnut and black locust dominated plots of 100 m2 representing coppice or over-aged stands. We collected and analysed data related to vascular plant composition and richness, soil physical features (moisture content, shear strength and penetration resistance), ammonia-oxidising archaea in the soil, and stand structure features. Composition of vascular plants differed significantly between the two forest types, without the influence of management regime. Soil characteristics did not change comparing forest types, management regimes and their interaction, except for soil moisture that was higher in coppice forests. Ammonia-oxidising archaea abundance was lower in sweet chestnut stands. Sweet chestnut and black locust forests have a similar stand structure. The management regime played a role in determining mean diameter, number of stems and deadwood volume. We suggest adopting a heterogeneous array of silviculture practices to achieve the highest variety of forest structures and plant composition in Mediterranean hilly landscapes, coupled with management practices aimed at black locust control.
Numéro de notice :	A2023-199
Affiliation des auteurs :	non IGN
Thématique :	BIODIVERSITE/FORET
Nature :	Article
DOI :	10.1016/j.foreco.2023.120907
Date de publication en ligne :	22/03/2023
En ligne :	https://doi.org/10.1016/j.foreco.2023.120907
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103090

Detrending climate data prior to climate–growth analyses in dendroecology: a common best practice? / Clémentine Ols in Dendrochronologia, vol inconnu (2023)

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[article]
inDendrochronologia > vol inconnu (2023) . - n° 126094

Titre :	Detrending climate data prior to climate–growth analyses in dendroecology: a common best practice?
Type de document :	Article/Communication
Auteurs :	Clémentine Ols , Auteur ; Stefan Klesse, Auteur ; Martin P. Girardin, Auteur ; Margaret E.K. Evans, Auteur ; R. Justin DeRose, Auteur ; Valérie Trouet, Auteur
Année de publication :	2023
Article en page(s) :	n° 126094
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[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

Voir la suite...

Bulletin-géomatique

Geodata and Tools for Education and Research / Bénédicte Bucher (2022)

Public

Titre :	Geodata and Tools for Education and Research : Workshop report, AGILE Pre-Conference Workshop June 14th 2022 -Vilnius, Lithuania
Type de document :	Actes de congrès
Auteurs :	Bénédicte Bucher , Auteur ; Frédéric Cantat , Auteur ; Joep Crompvoets, Auteur ; Anka Lisec, Auteur ; Markéta Potůčková, Auteur ; Conor Cahalane, Auteur ; Evelyn Uuemaa, Auteur ; Mathieu Chartier, Auteur
Editeur :	Dublin : European Spatial Data Research EuroSDR
Année de publication :	2022
Conférence :	AGILE 2022, Pre-Conference Workshop 14/06/2022 Vilnius Lituanie
Importance :	15 p.
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Géomatique [Termes IGN] données localisées [Termes IGN] formation
Résumé :	(auteur) Geographical data and analyses are a useful asset in several domains of education and research including geography, history, urbanism or environmental science, amongst others, from primary school to higher education and life-long learning. In the specific context of Europe, as more and more data (including geographic data) becomes open for all, it is crucial to ensure these users have the capacity to make the most of the wealth of this data. Reciprocally, from the perspective of data providers, education and research are particularly important application domains. They have the ability to link knowledge (production or dissemination) with data and adopt critical perspectives on this data. In this context, a half-day workshop was organised by EuroSDR during the 2022 conference of the Association of Geographical Information Laboratories in Europe (AGILE). It focussed on current experiences developed by EuroSDR members, mainly at national mapping agencies, as well as proposals stemming from AGILE research communities, to share experiences and visions on this topic. It also targeted possible synergies to interconnect existing approaches, usually national, and achieve crossnational solutions, in Europe and beyond.
Numéro de notice :	17756
Affiliation des auteurs :	IGN+Ext (2020- )
Thématique :	GEOMATIQUE
Nature :	Actes
DOI :	sans
En ligne :	http://www.eurosdr.net/sites/default/files/uploaded_files/ws-report_geodatatools [...]
Format de la ressource électronique :	URL
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103187

Mapping territorial vulnerability to wildfires: A participative multi-criteria analysis / Miguel Rivière in Forest ecology and management, vol 539 (July-1 2023)

Allowing context to speak: the progressive case study method for cadastral systems research / Simon Hull in Survey review, vol 55 n° 390 (May 2023)

Detecting spatiotemporal propagation patterns of traffic congestion from fine-grained vehicle trajectory data / Haoyi Xiong in International journal of geographical information science IJGIS, vol 37 n° 5 (May 2023)

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[article]
inInternational journal of geographical information science IJGIS > vol 37 n° 5 (May 2023) . - pp 1157-1179

Titre :	Detecting spatiotemporal propagation patterns of traffic congestion from fine-grained vehicle trajectory data
Type de document :	Article/Communication
Auteurs :	Haoyi Xiong, Auteur ; Xun Zhou, Auteur ; David A. Bennett, Auteur
Année de publication :	2023
Article en page(s) :	pp 1157-1179
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Analyse spatiale [Termes IGN] déformation temporelle dynamique (algorithme) [Termes IGN] détection d'anomalie [Termes IGN] données spatiotemporelles [Termes IGN] événement [Termes IGN] flux [Termes IGN] gestion de trafic [Termes IGN] réseau routier [Termes IGN] trafic routier
Résumé :	(auteur) Traffic congestion on a road segment typically begins as a small-scale spatiotemporal event that can then propagate throughout a road network and produce large-scale disruptions to a transportation system. In current techniques for the analysis of network flow, data is often aggregated to relatively large (e.g. 5 min) discrete time steps that obscure the small-scale spatiotemporal interactions that drive larger-scale dynamics. We propose a new method that handles fine-grained data to better capture those dynamics. Propagation patterns of traffic congestion are represented as spatiotemporally connected events. Each event is captured as a time series at the temporal resolution of the available trajectory data and at the spatial resolution of the network edge. The spatiotemporal propagation patterns of traffic congestion are captured using Dynamic Time Warping and represented as a set of directed acyclic graphs of spatiotemporal events. Results from this method are compared to an existing method using fine-grained data derived from an agent-based model of traffic simulation. Our method outperforms the existing method. Our method also successfully detects congestion propagation patterns that were reported by media news using sparse real-world data derived from taxis.
Numéro de notice :	A2023-225
Affiliation des auteurs :	non IGN
Thématique :	GEOMATIQUE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1080/13658816.2023.2178653
Date de publication en ligne :	22/02/2023
En ligne :	https://doi.org/10.1080/13658816.2023.2178653
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103177

Transform paper-based cadastral data into digital systems using GIS and end-to-end deep learning techniques / Joseph Mango in International journal of geographical information science IJGIS, vol 37 n° 5 (May 2023)

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[article]
inInternational journal of geographical information science IJGIS > vol 37 n° 5 (May 2023) . - pp 1099 - 1127

Titre :	Transform paper-based cadastral data into digital systems using GIS and end-to-end deep learning techniques
Type de document :	Article/Communication
Auteurs :	Joseph Mango, Auteur ; Moyang Wang, Auteur ; Senlin Mu, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	pp 1099 - 1127
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Cadastre [Termes IGN] apprentissage profond [Termes IGN] données cadastrales [Termes IGN] numérisation du cadastre [Termes IGN] réseau neuronal artificiel [Termes IGN] système d'information géographique
Résumé :	(auteur) Digital systems storing cadastral data in vector format are considered effective due to their ability of offering interactive services to citizens and other land-related systems. The adoption of such systems is ubiquitous, but when adopted, they create two non-compatible systems with paper-based cadastral systems whose information needs to be digitised. This study proposes a new approach that is fast and accurate for transforming paper-based cadastral data into digital systems. The proposed method involves deep-learning techniques of the LCNN and ResNet-50 for detecting cadastral parcels and their numbers, respectively, from the cadastral plans. It also contains four functions defined to speed up transformations and compilations of the cadastral plan’s data in digital systems. The LCNN is trained and validated with 968 samples. The ResNet-50 is trained and validated with 106,000 samples. The Structural-Average-Precision (sAP10) achieved with the LCNN was 0.9057. The Precision, Recall and F1-Score achieved with the ResNet-50 were 0.9650, 0.9648 and 0.9649, respectively. These results confirmed that the new method is accurate enough for implementation, and we tested it with a huge set of data from Tanzania. Its performance from the experimented data shows that the proposed method could effectively transform paper-based cadastral data into digital systems.
Numéro de notice :	A2023-212
Affiliation des auteurs :	non IGN
Thématique :	GEOMATIQUE
Nature :	Article
DOI :	10.1080/13658816.2023.2178002
Date de publication en ligne :	22/03/2023
En ligne :	https://doi.org/10.1080/13658816.2023.2178002
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103139

Voir la suite...

Bulletin-imagerie

Drought-vulnerable vegetation increases exposure of disadvantaged populations to heatwaves under global warming: A case study from Los Angeles / Chunyu Dong in Sustainable Cities and Society, vol 93 (June 2023)

Public

[article]
inSustainable Cities and Society > vol 93 (June 2023) . - n° 104488

Titre :	Drought-vulnerable vegetation increases exposure of disadvantaged populations to heatwaves under global warming: A case study from Los Angeles
Type de document :	Article/Communication
Auteurs :	Chunyu Dong, Auteur ; Yu Yan, Auteur ; Jie Guo, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	n° 104488
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de télédétection [Termes IGN] changement climatique [Termes IGN] climat urbain [Termes IGN] données socio-économiques [Termes IGN] espace vert [Termes IGN] ilot thermique urbain [Termes IGN] image Terra-MODIS [Termes IGN] Los Angeles [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] sécheresse [Termes IGN] température au sol
Résumé :	(auteur) Urban vegetation is valuable in alleviating local heatwaves. However, drought may decrease vegetation health and limit this cooling effect. Here we use satellite-based Normalized Difference Vegetation Index (NDVI) and Palmer Drought Severity Index (PDSI) to investigate the sensitivity of urban vegetation to drought in Coastal Greater Los Angeles (CGLA) from 2001 to 2020. We applied four statistical models to analyze the relations between 15 socioeconomic variables and the vegetation's sensitivity to drought. We then examined the changes in the cooling effect of the urban vegetation during drought and non-drought periods using remotely sensed land surface temperature (LST) data. The results suggest that economically disadvantaged areas with higher proportions of Hispanics and Blacks are typified by vegetation more sensitive to drought, which is likely linked to inequality in water use. Moreover, these populations experience a lower degree of vegetation cooling effects and higher exposure to heatwaves. The findings of this study imply that the potential of a community's vegetation in mitigating heatwaves is significantly influenced by the socioeconomic conditions of the community. Increasing the resilience of urban vegetation to drought in disadvantaged communities may help promote environmentally sustainable and socially resilient cities under a warming climate.
Numéro de notice :	A2023-191
Affiliation des auteurs :	non IGN
Thématique :	IMAGERIE
Nature :	Article
DOI :	10.1016/j.scs.2023.104488
Date de publication en ligne :	26/02/2023
En ligne :	https://doi.org/10.1016/j.scs.2023.104488
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=102972

A minimal solution for image-based sphere estimation / Tekla Tóth in International journal of computer vision, vol 131 n° 6 (June 2023)

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[article]
inInternational journal of computer vision > vol 131 n° 6 (June 2023) . - pp 1428 - 1447

Titre :	A minimal solution for image-based sphere estimation
Type de document :	Article/Communication
Auteurs :	Tekla Tóth, Auteur ; Levente Hajder, Auteur
Année de publication :	2023
Article en page(s) :	pp 1428 - 1447
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement d'image optique [Termes IGN] algorithme de Levenberg-Marquardt [Termes IGN] cône [Termes IGN] ellipse [Termes IGN] Matlab [Termes IGN] reconstruction d'image [Termes IGN] représentation géométrique [Termes IGN] sphère [Termes IGN] sphère paramétrique
Résumé :	(auteur) We propose a novel minimal solver for sphere fitting via its 2D central projection, i.e., a special ellipse. The input of the presented algorithm consists of contour points detected in a camera image. General ellipse fitting problems require five contour points. However, taking advantage of the isotropic spherical target, three points are enough to define the tangent cone parameters of the sphere. This yields the sought ellipse parameters. Similarly, the sphere center can be estimated from the cone if the radius is known. These proposed geometric methods are rapid, numerically stable, and easy to implement. Experimental results—on synthetic, photorealistic, and real images—showcase the superiority of the proposed solutions to the state-of-the-art methods. A real-world LiDAR-camera calibration application justifies the utility of the sphere-based approach resulting in an error below a few centimeters.
Numéro de notice :	A2023-189
Affiliation des auteurs :	non IGN
Thématique :	IMAGERIE
Nature :	Article
DOI :	10.1007/s11263-023-01766-1
Date de publication en ligne :	02/03/2023
En ligne :	https://doi.org/10.1007/s11263-023-01766-1
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103061

Deblurring low-light images with events / Chu Zhou in International journal of computer vision, vol 131 n° 5 (May 2023)

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[article]
inInternational journal of computer vision > vol 131 n° 5 (May 2023) . - pp 1284 - 1298

Titre :	Deblurring low-light images with events
Type de document :	Article/Communication
Auteurs :	Chu Zhou, Auteur ; Minggui Teng, Auteur ; Jin Han, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	pp 1284 - 1298
Note générale :	bilbiographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement d'image optique [Termes IGN] apprentissage profond [Termes IGN] caméra d'événement [Termes IGN] correction d'image [Termes IGN] filtrage du bruit [Termes IGN] flou [Termes IGN] image à basse résolution [Termes IGN] image RVB
Résumé :	(auteur) Modern image-based deblurring methods usually show degenerate performance in low-light conditions since the images often contain most of the poorly visible dark regions and a few saturated bright regions, making the amount of effective features that can be extracted for deblurring limited. In contrast, event cameras can trigger events with a very high dynamic range and low latency, which hardly suffer from saturation and naturally encode dense temporal information about motion. However, in low-light conditions existing event-based deblurring methods would become less robust since the events triggered in dark regions are often severely contaminated by noise, leading to inaccurate reconstruction of the corresponding intensity values. Besides, since they directly adopt the event-based double integral model to perform pixel-wise reconstruction, they can only handle low-resolution grayscale active pixel sensor images provided by the DAVIS camera, which cannot meet the requirement of daily photography. In this paper, to apply events to deblurring low-light images robustly, we propose a unified two-stage framework along with a motion-aware neural network tailored to it, reconstructing the sharp image under the guidance of high-fidelity motion clues extracted from events. Besides, we build an RGB-DAVIS hybrid camera system to demonstrate that our method has the ability to deblur high-resolution RGB images due to the natural advantages of our two-stage framework. Experimental results show our method achieves state-of-the-art performance on both synthetic and real-world images.
Numéro de notice :	A2023-210
Affiliation des auteurs :	non IGN
Thématique :	IMAGERIE
Nature :	Article
DOI :	10.1007/s11263-023-01754-5
Date de publication en ligne :	06/02/2023
En ligne :	https://doi.org/10.1007/s11263-023-01754-5
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103062

Evaluating TROPOMI and MODIS performance to capture the dynamic of air pollution in São Paulo state: A case study during the COVID-19 outbreak / A.P. Rudke in Remote sensing of environment, vol 289 (May 2003)

Public

[article]
inRemote sensing of environment > vol 289 (May 2003) . - n° 113514

Titre :	Evaluating TROPOMI and MODIS performance to capture the dynamic of air pollution in São Paulo state: A case study during the COVID-19 outbreak
Type de document :	Article/Communication
Auteurs :	A.P. Rudke, Auteur ; J.A. Martins, Auteur ; R. Hallak, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	n° 113514
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de télédétection [Termes IGN] correction atmosphérique [Termes IGN] dioxyde d'azote [Termes IGN] épidémie [Termes IGN] image Sentinel-5P-TROPOMI [Termes IGN] image Terra-MODIS [Termes IGN] pollution atmosphérique [Termes IGN] qualité de l'air [Termes IGN] Sao Paulo
Résumé :	(auteur) Atmospheric pollutant data retrieved through satellite sensors are continually used to assess changes in air quality in the lower atmosphere. During the COVID-19 pandemic, several studies started to use satellite measurements to evaluate changes in air quality in many different regions worldwide. However, although satellite data is continuously validated, it is known that its accuracy may vary between monitored areas, requiring regionalized quality assessments. Thus, this study aimed to evaluate whether satellites could measure changes in the air quality of the state of São Paulo, Brazil, during the COVID-19 outbreak; and to verify the relationship between satellite-based data [Tropospheric NO2 column density and Aerosol Optical Depth (AOD)] and ground-based concentrations [NO2 and particulate material (PM; coarse: PM10 and fine: PM2.5)]. For this purpose, tropospheric NO2 obtained from the TROPOMI sensor and AOD retrieved from MODIS sensor data by using the Multi-Angle Implementation of Atmospheric Correction (MAIAC) algorithm were compared with concentrations obtained from 50 automatic ground monitoring stations. The results showed low correlations between PM and AOD. For PM10, most stations showed correlations lower than 0.2, which were not significant. The results for PM2.5 were similar, but some stations showed good correlations for specific periods (before or during the COVID-19 outbreak). Satellite-based Tropospheric NO2 proved to be a good predictor for NO2 concentrations at ground level. Considering all stations with NO2 measurements, correlations >0.6 were observed, reaching 0.8 for specific stations and periods. In general, it was observed that regions with a more industrialized profile had the best correlations, in contrast with rural areas. In addition, it was observed about 57% reductions in tropospheric NO2 throughout the state of São Paulo during the COVID-19 outbreak. Variations in air pollutants were linked to the region economic vocation, since there were reductions in industrialized areas (at least 50% of the industrialized areas showed >20% decrease in NO2) and increases in areas with farming and livestock characteristics (about 70% of those areas showed increase in NO2). Our results demonstrate that Tropospheric NO2 column densities can serve as good predictors of NO2 concentrations at ground level. For MAIAC-AOD, a weak relationship was observed, requiring the evaluation of other possible predictors to describe the relationship with PM. Thus, it is concluded that regionalized assessment of satellite data accuracy is essential for assertive estimates on a regional/local level. Good quality information retrieved at specific polluted areas does not assure a worldwide use of remote sensor data.
Numéro de notice :	A2023-170
Affiliation des auteurs :	non IGN
Thématique :	IMAGERIE
Nature :	Article
DOI :	10.1016/j.rse.2023.113514
Date de publication en ligne :	21/02/2023
En ligne :	https://doi.org/10.1016/j.rse.2023.113514
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=102930

Flood vulnerability assessment of urban buildings based on integrating high-resolution remote sensing and street view images / Ziyao Xing in Sustainable Cities and Society, vol 92 (May 2023)

Public

[article]
inSustainable Cities and Society > vol 92 (May 2023) . - n° 104467

Titre :	Flood vulnerability assessment of urban buildings based on integrating high-resolution remote sensing and street view images
Type de document :	Article/Communication
Auteurs :	Ziyao Xing, Auteur ; Shuai Yang, Auteur ; Xuli Zan, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	n° 104467
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement d'image optique [Termes IGN] attention (apprentissage automatique) [Termes IGN] bâtiment [Termes IGN] Chine [Termes IGN] gestion des risques [Termes IGN] image Streetview [Termes IGN] inondation [Termes IGN] milieu urbain [Termes IGN] planification urbaine [Termes IGN] Quickbird [Termes IGN] segmentation sémantique [Termes IGN] vulnérabilité
Résumé :	(auteur) Urban flood risk management requires an extensive investigation of the vulnerability characteristics of buildings. Large-scale field surveys usually cost a lot of time and money, while satellite remote sensing and street view images can provide information on the tops and facades of buildings respectively. Thereupon, this paper develops a building vulnerability assessment framework using remote sensing and street view features. Specifically, a UNet-based semantic segmentation model, FSA-UNet (Fusion-Self-Attention-UNet) is proposed to integrate remote sensing and street view features and the vulnerability information contained in the images is fully exploited. And the building vulnerability index is generated to provide the spatial distribution characteristics of urban building vulnerability. The experiment shows that the mIoU of the proposed model can reach 82% for building vulnerability classification in Hefei, China, which is more accurate than the traditional semantic segmentation models. The results indicate that the integration of street view and remote sensing image features can improve the ability of building vulnerability assessment, and the model proposed in this study can better capture the correlation features of multi-angle images through the self-attention mechanism and combines hierarchy features and edge information to improve the classification effect. This study can support for disaster management and urban planning.
Numéro de notice :	A2023-152
Affiliation des auteurs :	non IGN
Thématique :	IMAGERIE
Nature :	Article
DOI :	10.1016/j.scs.2023.104467
Date de publication en ligne :	23/02/2023
En ligne :	https://doi.org/10.1016/j.scs.2023.104467
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=102826

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Bulletin-positionnement

Beyond 100: The Next Century in Geodesy / J. Freymueller (2022)

Public

Titre :	Beyond 100: The Next Century in Geodesy : Proceedings of the IAG General Assembly, Montreal, Canada, July 8-18, 2019
Type de document :	Actes de congrès
Auteurs :	J. Freymueller, Éditeur scientifique ; Laura Sánchez, Éditeur scientifique
Editeur :	Berlin, Heidelberg, Vienne, New York, ... : Springer
Année de publication :	2022
Collection :	International Association of Geodesy Symposia, ISSN 0939-9585 num. 152
Conférence :	IAG 2019, General Assembly 08/07/2019 18/07/2019 Montreal Canada OA proceedings
Importance :	663 p.
Format :	16 x 24 cm
ISBN/ISSN/EAN :	978-3-031-09857-4
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Géodésie [Termes IGN] géodynamique [Termes IGN] hydrosphère [Termes IGN] marée terrestre [Termes IGN] modèle de géopotentiel [Termes IGN] positionnement par GNSS [Termes IGN] positionnement ponctuel précis [Termes IGN] rotation de la Terre [Termes IGN] système de référence géodésique
Résumé :	(éditeur) This open access book contains 30 peer-reviewed papers based on presentations at the 27th General Assembly of the International Union of Geodesy and Geophysics (IUGG). The meeting was held from July 8 to 18, 2019 in Montreal, Canada, with the theme being the celebration of the centennial of the establishment of the IUGG. The centennial was also a good opportunity to look forward to the next century, as reflected in the title of this volume. The papers in this volume represent a cross-section of present activity in geodesy, and highlight the future directions in the field as we begin the second century of the IUGG. During the meeting, the International Association of Geodesy (IAG) organized one Union Symposium, 6 IAG Symposia, 7 Joint Symposia with other associations, and 20 business meetings. In addition, IAG co-sponsored 8 Union Symposia and 15 Joint Symposia. In total, 3952 participants registered, 437 of them with IAG priority. In total, there were 234 symposia and 18 Workshops with 4580 presentations, of which 469 were in IAG-associated symposia.
Note de contenu :	I- Multi-Signal Positioning, Remote Sensing and Applications II- Monitoring and Understanding the Dynamic Earth with Geodetic Observations III- Geodesy for Atmospheric and Hydrospheric Climate Research (IAG, IAMAS, IACS, IAPSO)
Numéro de notice :	24104
Affiliation des auteurs :	non IGN
Thématique :	POSITIONNEMENT
Nature :	Actes
DOI :	sans
En ligne :	https://link.springer.com/book/10.1007/978-3-031-09857-4?page=2#toc
Format de la ressource électronique :	URL
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=102748

Contient

Estimation of Lesser Antilles vertical velocity fields using a GNSS-PPP software comparison / Pierre Sakic-Kieffer (2022)

A consistent regional vertical ionospheric model and application in PPP-RTK under sparse networks / Sijie Lyu in Navigation : journal of the Institute of navigation, vol 70 n° 3 (Fall 2023)

RTK-quality positioning with global precise point positioning corrections / Nacer Naciri in Navigation : journal of the Institute of navigation, vol 70 n° 3 (Fall 2023)

Public

[article]
inNavigation : journal of the Institute of navigation > vol 70 n° 3 (Fall 2023) . - n° 575

Titre :	RTK-quality positioning with global precise point positioning corrections
Type de document :	Article/Communication
Auteurs :	Nacer Naciri, Auteur ; Sunil Bisnath, Auteur
Année de publication :	2023
Article en page(s) :	n° 575
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Navigation et positionnement [Termes IGN] fréquence multiple [Termes IGN] modèle mathématique [Termes IGN] positionnement cinématique en temps réel [Termes IGN] positionnement ponctuel précis [Termes IGN] signal GNSS
Résumé :	(auteur) Global navigation satellite system (GNSS) precise point positioning (PPP) has potential as an alternative or replacement for real-time kinematic (RTK) processing. In this work, we reached for RTK levels of performance without the need for local information through PPP (i.e., centimeter-level positioning that was reached near-instantaneously). This work makes use of information currently available from processing signals from global positioning system (GPS), Galileo, BeiDou-2/3, and GLONASS by fixing ambiguities for the first three constellations on all available frequencies. This processing was done using a four-frequency, four-constellation uncombined decoupled clock model (DCM) that has been expanded as part of this work. The results were tested on 1448 global datasets and showed that instantaneous convergence on average to 2.5 cm error can be achieved for 81% of the stations. These findings were reinforced by the results of epoch-by-epoch processing, as an average of 80% of all single epochs converged below 2.5 cm error at 1σ, as opposed to less than the 0.5% typically observed for classic PPP.
Numéro de notice :	A2023-205
Affiliation des auteurs :	non IGN
Thématique :	POSITIONNEMENT
Nature :	Article
DOI :	10.33012/navi.575
Date de publication en ligne :	29/01/2023
En ligne :	https://doi.org/10.33012/navi.575
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103107

Performance analysis of cross-frequency Doppler-assisted carrier phase tracking / Dun Wang in GPS solutions, vol 27 n° 3 (July 2023)

Public

[article]
inGPS solutions > vol 27 n° 3 (July 2023) . - n° 105

Titre :	Performance analysis of cross-frequency Doppler-assisted carrier phase tracking
Type de document :	Article/Communication
Auteurs :	Dun Wang, Auteur ; Shuangna Zhang, Auteur ; Tong Liu, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	n° 105
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement du signal [Termes IGN] bruit thermique [Termes IGN] erreur systématique interfréquence d'horloge [Termes IGN] fréquence [Termes IGN] méthode de Monte-Carlo [Termes IGN] modèle mathématique [Termes IGN] phase [Termes IGN] signal GNSS
Résumé :	(auteur) Using the Doppler frequency obtained from tracking a GNSS pilot signal to aid in tracking another signal modulated with higher rate navigation messages in a different frequency band can improve tacking robustness and lower the message demodulation threshold. Based on an analysis of received signal frequency coherence, a linearized mathematical model of the cross-frequency Doppler-assisted carrier phase tracking loop is built, a thermal noise jitter calculation equation for the assisted tracking loop is derived, and its dynamic stress response characteristics are examined. The loop design requirements for eliminating the influence of inter-frequency frequency bias are clarified, as are the cross-frequency assist signal selection criteria. Monte Carlo simulations and preliminary field tests validate the theoretical results using the B1C pilot signal-aided tracking B2b signal of the MEO satellite in the BeiDou satellite navigation system (BDS). Experimental results show that the carrier phase tracking threshold of the B2b signal can be reduced by about 4 dB.
Numéro de notice :	A2023-214
Affiliation des auteurs :	non IGN
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s10291-023-01434-4
En ligne :	https://doi.org/10.1007/s10291-023-01434-4
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103143

Resilient GNSS real-time kinematic precise positioning with inequality and equality constraints / Zhetao Zhang in GPS solutions, vol 27 n° 3 (July 2023)

Public

[article]
inGPS solutions > vol 27 n° 3 (July 2023) . - n° 116

Titre :	Resilient GNSS real-time kinematic precise positioning with inequality and equality constraints
Type de document :	Article/Communication
Auteurs :	Zhetao Zhang, Auteur ; Yuan Li, Auteur ; Xiufeng He, Auteur ; et al., Auteur
Année de publication :	2023
Article en page(s) :	n° 116
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Navigation et positionnement [Termes IGN] contrainte d'intégrité [Termes IGN] positionnement cinématique en temps réel [Termes IGN] positionnement par GNSS [Termes IGN] précision du positionnement [Termes IGN] résolution d'ambiguïté
Résumé :	(auteur) How to conduct the GNSS real-time kinematic precise positioning in challenging environments is not an easy problem. The challenging environment mainly refers to frequent signal reflection, refraction, diffraction, and occlusion, inevitably introducing large positioning errors. We propose a resilient positioning method considering the inequality and equality constraints. Specifically, first, we introduce the functional and stochastic models of real-time kinematic (RTK) positioning, considering the impacts of challenging environments. Second, specific iterative procedures of resilient GNSS precise positioning method with inequality and equality constraints are proposed. In addition, a general form of inequality constraints in terms of coordinate components is given that is suitable for real-time kinematic situations. Four 24-h real datasets in canyon environments were collected to verify the performance of the proposed method. The results show that compared with the traditional RTK positioning without inequality constraints, the proposed method can improve the success rates of ambiguity resolution by 42.2% on average. Also, the positioning accuracy of fixed solutions can be improved significantly after applying the proposed method, where the root mean square errors can be reduced by 77.2% on average. Therefore, the proposed method can significantly improve success rates of ambiguity resolution and positioning accuracy, which is especially promising in challenging environments.
Numéro de notice :	A2023-213
Affiliation des auteurs :	non IGN
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s10291-023-01454-0
Date de publication en ligne :	26/04/2023
En ligne :	https://doi.org/10.1007/s10291-023-01454-0
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=103142

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IGN

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Bulletin-imagerie

Bulletin-positionnement

IGN / ENSG

L'IGN a pour vocation

Accès directs

2014-2022 IGN

IGN

Centre dedocumentationscientifique

Accueil

Sélection de la langue

Adresse

Se connecter

Alertes

Actualité

L'actu ! voici les beaux jours et l'envol des étudiants vers leurs stages

Informations pratiques

Bulletins thématiques

Bulletin-forêt

Bulletin-géomatique

Bulletin-imagerie

Bulletin-positionnement

IGN / ENSG

L'IGN a pour vocation

Accès directs

2014-2022 IGN

Centre dedocumentation
scientifique