Catalogue en ligne IGN

1-Publications IGN 2022

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Modeling and propagating inventory-based sampling uncertainty in the large-scale forest demographic model “MARGOT” / Timothée Audinot in Natural Resource Modelling, vol 35 n° 3 (August 2022)

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[article]
inNatural Resource Modelling > vol 35 n° 3 (August 2022) . - n° e12352

Titre :	Modeling and propagating inventory-based sampling uncertainty in the large-scale forest demographic model “MARGOT”
Type de document :	Article/Communication
Auteurs :	Timothée Audinot , Auteur ; Holger Wernsdörfer, Auteur ; Gilles Le Moguédec, Auteur ; Jean-Daniel Bontemps , Auteur
Année de publication :	2022
Projets :	ModForTrans / Bontemps, Jean-Daniel, ARBRE / AgroParisTech
Article en page(s) :	n° e12352
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] incertitude des données [Termes IGN] inventaire forestier national (données France) [Termes IGN] modélisation de la forêt [Termes IGN] propagation d'incertitude [Vedettes matières IGN] Inventaire forestier
Résumé :	(auteur) Models based on national forest inventory (NFI) data intend to project forests under management and policy scenarios. This study aimed at quantifying the influence of NFI sampling uncertainty on parameters and simulations of the demographic model MARGOT. Parameter variance–covariance structure was estimated from bootstrap sampling of NFI field plots. Parameter variances and distributions were further modeled to serve as a plug-in option to any inventory-based initial condition. Forty-year time series of observed forest growing stock were compared with model simulations to balance model uncertainty and bias. Variance models showed high accuracies. The Gamma distribution best fitted the distributions of transition, mortality and felling rates, while the Gaussian distribution best fitted tree recruitment fluxes. Simulation uncertainty amounted to 12% of the model bias at the country scale. Parameter covariance structure increased simulation uncertainty by 5.5% in this 12%. This uncertainty appraisal allows targeting model bias as a modeling priority.
Numéro de notice :	A2022-576
Affiliation des auteurs :	LIF+Ext (2020- )
Autre URL associée :	vers HAL
Thématique :	FORET/MATHEMATIQUE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1111/nrm.12352
Date de publication en ligne :	08/08/2022
En ligne :	https://doi.org/10.1111/nrm.12352
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=101333

Multi-nomenclature, multi-resolution joint translation: an application to land-cover mapping / Luc Baudoux in International journal of geographical information science IJGIS, vol 37 n° 2 (February 2023)

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[article]
inInternational journal of geographical information science IJGIS > vol 37 n° 2 (February 2023) . - pp ?

Titre :	Multi-nomenclature, multi-resolution joint translation: an application to land-cover mapping
Type de document :	Article/Communication
Auteurs :	Luc Baudoux , Auteur ; Jordi Inglada, Auteur ; Clément Mallet , Auteur
Année de publication :	2023
Projets :	AI4GEO / AgroParisTech
Article en page(s) :	pp ?
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[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

An improved vertical correction method for the inter-comparison and inter-validation of Integrated Water Vapour measurements [under review] / Olivier Bock in Atmospheric measurement techniques, vol 15 n° 19 ([01/04/2022])

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[article]
inAtmospheric measurement techniques > vol 15 n° 19 [01/04/2022] . - pp 5643 - 5665

Titre :	An improved vertical correction method for the inter-comparison and inter-validation of Integrated Water Vapour measurements [under review]
Type de document :	Article/Communication
Auteurs :	Olivier Bock , Auteur ; Pierre Bosser , Auteur ; Carl Mears, Auteur
Année de publication :	2022
Projets :	VEGAN / Bock, Olivier
Article en page(s) :	pp 5643 - 5665
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] analyse comparative [Termes IGN] correction des altitudes [Termes IGN] données GPS [Termes IGN] données météorologiques [Termes IGN] erreur systématique [Termes IGN] montagne [Termes IGN] régression multiple [Termes IGN] teneur intégrée en vapeur d'eau [Termes IGN] zone intertropicale
Résumé :	(auteur) Integrated Water Vapour (IWV) measurements from similar or different techniques are often inter-compared for calibration and validation purposes. Results are usually assessed in terms of bias (difference of the means), standard deviation of the differences, and linear fit slope and offset (intercept) estimates. When the instruments are located at different elevations, a correction must be applied to account for the vertical displacement between the sites. Empirical formulations are traditionally used for this correction. In this paper, we show that the widely-used correction model based on a standard, exponential, profile for water vapour cannot properly correct the bias, slope, and offset parameters simultaneously. Correcting the bias with this model degrades the slope and offset estimates, and vice-versa. This paper proposes an improved correction model which overcomes these limitations. The model uses a multi-linear regression of slope and offset parameters from a radiosonde climatology. It is able to predict monthly parameters with a root-mean-square error smaller than 0.5 kg m-2 for height differences up to 500 m. The method is applied to the inter-comparison of GPS IWV data in a tropical mountainous area and to the inter-validation of GPS and satellite microwave radiometer data. This paper also emphasizes the need for using a slope and offset regression method that accounts for errors in both variables and for correctly specifying these errors.
Numéro de notice :	A2022-327
Affiliation des auteurs :	UMR IPGP-Géod+Ext (2020- )
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.5194/amt-15-5643-2022
Date de publication en ligne :	21/04/2022
En ligne :	https://doi.org/10.5194/amt-15-5643-2022
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=100492

Diffuse sunlight and cosmic rays: Missing pieces of the forest growth change attribution puzzle? / Jean-Daniel Bontemps in Science of the total environment, vol 806 n°1 (February 2022)

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[article]
inScience of the total environment > vol 806 n°1 (February 2022) . - n° 150469

Titre :	Diffuse sunlight and cosmic rays: Missing pieces of the forest growth change attribution puzzle?
Type de document :	Article/Communication
Auteurs :	Jean-Daniel Bontemps , Auteur ; Henrik Svensmark, Auteur
Année de publication :	2022
Projets :	1-Pas de projet / Bock, Olivier
Article en page(s) :	n° 150469
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] cerne [Termes IGN] croissance des arbres [Termes IGN] dioxyde de carbone [Termes IGN] modèle de croissance végétale [Termes IGN] modélisation de la forêt [Termes IGN] photosynthèse [Termes IGN] rayonnement cosmique [Termes IGN] rayonnement lumineux [Vedettes matières IGN] Végétation et changement climatique
Résumé :	(auteur) Forest growth changes have been a matter of intense research efforts since the 1980s. Owing to the variety of their environmental causes – mainly atmospheric CO2 increase, atmospheric N deposition, changes in temperature and water availability, and their interactions – their interpretation has remained challenging. Recent isolated researches suggest further effects of neglected environmental factors, namely changes in the diffuse fraction of light, more efficient to photosynthesis, and galactic cosmic rays (GCR), both emphasized in this Discussion paper. With growing awareness of GCR influence on global cloudiness (the cosmoclimatologic theory by H. Svensmark), GCR may thus cause trends in diffuse-light, and distinguishing between their direct/indirect influences on forest growth remains uncertain. This link between cosmic rays and diffuse sunlight also forms an alternative explanation to the geological evidence of a negative correlation between GCR and atmospheric CO2 concentration over the past 500 Myr. After a careful scrutiny of this literature and of key contributions in the field, we draw research options to progress further in this attribution. These include i) observational strategies intending to build on differences in the spatio-temporal dynamics of environmental growth factors, ranging from quasi-experiments to meta-analyses, ii) simulation strategies intending to quantify environmental factor's effects based on process-based ecosystem modelling, in a context where progresses for accounting for diffuse-light fraction are ongoing. Also, the hunt for tree-ring based proxies of GCR may offer the perspective of testing the GCR hypothesis on fully coupled forest growth samples.
Numéro de notice :	A2022-001
Affiliation des auteurs :	LIF+Ext (2020- )
Thématique :	FORET
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1016/j.scitotenv.2021.150469
Date de publication en ligne :	21/09/2021
En ligne :	https://doi.org/10.1016/j.scitotenv.2021.150469
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=98515

Offering the appetite for the monitoring of European forests a diversified diet / Jean-Daniel Bontemps in Annals of Forest Science, vol 79 n° 1 (2022)

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[article]
inAnnals of Forest Science > vol 79 n° 1 (2022) . - n° 19

Titre :	Offering the appetite for the monitoring of European forests a diversified diet
Type de document :	Article/Communication
Auteurs :	Jean-Daniel Bontemps , Auteur ; Olivier Bouriaud , Auteur ; Cédric Vega , Auteur ; Laura Bouriaud , Auteur
Année de publication :	2022
Projets :	1-Pas de projet / Bock, Olivier
Article en page(s) :	n° 19
Note générale :	bibliographie NB article d'opinion
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] Europe (géographie politique) [Termes IGN] intégration [Termes IGN] inventaire forestier étranger (données) [Termes IGN] inventaire forestier national (données France) [Termes IGN] politique publique [Termes IGN] ressources forestières [Termes IGN] santé des forêts [Termes IGN] surveillance forestière [Termes IGN] Union Européenne [Vedettes matières IGN] Végétation et changement climatique
Résumé :	(auteur) Forest monitoring in Europe is turning matter of renewed political concern, and a possible role for ICP Forests health monitoring has been suggested to meet this goal (Ann For Sci 78:94, 2021). Multipurpose national forest inventory (NFI) surveys yet offer a sampling effort by two orders of magnitude greater than ICP level 1, have accomplished substantial methodological and harmonization progresses in the recent years, and therefore form a decisive contributor to future European forest monitoring incentives. Possible paths for the future development of a pan-European, comprehensive and more accurate monitoring are designed that stress a crucial need to build on the assets of the existing forest monitoring programs and favor their cooperation, in order to limit the co-existence of distinct forest monitoring processes.
Numéro de notice :	A2022-320
Affiliation des auteurs :	LIF+Ext (2020- )
Thématique :	FORET
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1186/s13595-022-01139-7
Date de publication en ligne :	11/04/2022
En ligne :	http://dx.doi.org/10.1186/s13595-022-01139-7
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=100432

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2-Publications IGN 2021

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SAR data for tropical forest disturbance alerts in French Guiana: Benefit over optical imagery / Marie Ballère in Remote sensing of environment, Vol 252 (January 2021)

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[article]
inRemote sensing of environment > Vol 252 (January 2021) . - n° 112159

Titre :	SAR data for tropical forest disturbance alerts in French Guiana: Benefit over optical imagery
Type de document :	Article/Communication
Auteurs :	Marie Ballère , Auteur ; Alexandre Bouvet, Auteur ; Stéphane Mermoz, Auteur ; Thuy Le Toan, Auteur ; Thierry Koleck, Auteur ; Caroline Bedeau, Auteur ; Mathilde André, Auteur ; Elodie Forestier, Auteur ; Pierre-Louis Frison , Auteur ; Cédric Lardeux, Auteur
Année de publication :	2021
Projets :	1-Pas de projet / Bock, Olivier
Article en page(s) :	n° 112159
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] forêt tropicale [Termes IGN] Guyane (département français) [Termes IGN] image radar moirée [Termes IGN] image Sentinel-SAR [Termes IGN] surveillance forestière [Termes IGN] temps réel
Résumé :	(auteur) French Guiana forests cover 8 million hectares. With 98% of emerged land covered by forests, French Guiana is the area with the highest proportion of forest cover in the world. These forests are home to an exceptionally rich and diverse wealth of biodiversity that is both vulnerable and under threat due to high levels of pressure from human activity. As part of the French territory, French Guiana benefits from determined and continuous national efforts in the preservation of biodiversity and the environmental functionalities of ecosystems. The loss and fragmentation of forest cover caused by gold mining (legal and illegal), smallholder agriculture and forest exploitation, are considered as small-scale disturbances, although representing strong effects to vulnerable natural habitats, landscapes, and local populations. To monitor forest management programs and combat illegal deforestation and forest opening near-real time alerts system based on remote sensing data are required. For this large territory under frequent cloud cover, Synthetic-Aperture Radar (SAR) data appear to be the best adapted. In this paper, a method for forest alerts in a near-real time context based on Sentinel-1 data over the whole of French Guiana (83,534 km2) was developed and evaluated. The assessment was conducted for 2 years between 2016 and 2018 and includes comparisons with reference data provided by French Guiana forest organizations and comparisons with the existing University of Maryland Global Land Analysis and Discovery Forest Alerts datasets based on Landsat data. The reference datasets include 1,867 plots covering 2,124.5 ha of gold mining, smallholder agriculture and forest exploitation. The validation results showed high user accuracies (96.2%) and producer accuracies (81.5%) for forest loss detection, with the latter much higher than for optical forest alerts (36.4%). The forest alerts maps were also compared in terms of detection timing, showing systematic temporal delays of up to one year in the optical method compared to the SAR method. These results highlight the benefits of SAR over optical imagery for forest alerts detection in French Guiana. Finally, the potential of the SAR method applied to tropical forests is discussed. The SAR-based map of this study is available on http://cesbiomass.net/.
Numéro de notice :	A2021-066
Affiliation des auteurs :	UGE-LASTIG+Ext (2020- )
Thématique :	FORET/IMAGERIE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1016/j.rse.2020.112159
Date de publication en ligne :	05/11/2020
En ligne :	https://doi.org/10.1016/j.rse.2020.112159
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=96937

Toward a yearly country-scale CORINE land-cover map without using images: A map translation approach / Luc Baudoux in Remote sensing, Vol 13 n° 6 (March 2021)

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[article]
inRemote sensing > Vol 13 n° 6 (March 2021) . - n° 1060 - 32 p.

Titre :	Toward a yearly country-scale CORINE land-cover map without using images: A map translation approach
Type de document :	Article/Communication
Auteurs :	Luc Baudoux , Auteur ; Jordi Inglada, Auteur ; Clément Mallet , Auteur
Année de publication :	2021
Projets :	AI4GEO / Bock, Olivier, MAESTRIA / Mallet, Clément
Article en page(s) :	n° 1060 - 32 p.
Note générale :	Bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Bases de données localisées [Termes IGN] appariement sémantique [Termes IGN] apprentissage dirigé [Termes IGN] carte d'occupation du sol [Termes IGN] changement d'occupation du sol [Termes IGN] classification par réseau neuronal convolutif [Termes IGN] Corine Land Cover [Termes IGN] détection de changement [Termes IGN] image à haute résolution [Termes IGN] inférence [Termes IGN] mise à jour automatique [Termes IGN] mise à jour de base de données
Résumé :	(Auteur) CORINE Land-Cover (CLC) and its by-products are considered as a reference baseline for land-cover mapping over Europe and subsequent applications. CLC is currently tediously produced each six years from both the visual interpretation and the automatic analysis of a large amount of remote sensing images. Observing that various European countries regularly produce in parallel their own land-cover country-scaled maps with their own specifications, we propose to directly infer CORINE Land-Cover from an existing map, therefore steadily decreasing the updating time-frame. No additional remote sensing image is required. In this paper, we focus more specifically on translating a country-scale remote sensed map, OSO (France), into CORINE Land Cover, in a supervised way. OSO and CLC not only differ in nomenclature but also in spatial resolution. We jointly harmonize both dimensions using a contextual and asymmetrical Convolution Neural Network with positional encoding. We show for various use cases that our method achieves a superior performance than the traditional semantic-based translation approach, achieving an 81% accuracy over all of France, close to the targeted 85% accuracy of CLC.
Numéro de notice :	A2021-244
Affiliation des auteurs :	UGE-LASTIG+Ext (2020- )
Autre URL associée :	vers HAL
Thématique :	GEOMATIQUE/IMAGERIE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.3390/rs13061060
Date de publication en ligne :	11/03/2021
En ligne :	https://dx.doi.org/10.3390/rs13061060
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=97311

Modelling bark volume for six commercially important tree species in France: assessment of models and application at regional scale / Rodolphe Bauer in Annals of Forest Science, vol 78 n° 4 (December 2021)

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[article]
inAnnals of Forest Science > vol 78 n° 4 (December 2021) . - n° 104

Titre :	Modelling bark volume for six commercially important tree species in France: assessment of models and application at regional scale
Type de document :	Article/Communication
Auteurs :	Rodolphe Bauer, Auteur ; Antoine Billard, Auteur ; Frédéric Mothe, Auteur ; Fleur Longuetaud, Auteur ; Mojtaba Houballah, Auteur ; Alain Bouvet, Auteur ; Henri E. Cuny , Auteur ; Antoine Colin , Auteur ; Francis Colin, Auteur
Année de publication :	2021
Projets :	ARBRE / AgroParisTech, EMERGE / Deleuze, Christine
Article en page(s) :	n° 104
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] Abies alba [Termes IGN] biomasse forestière [Termes IGN] Bourgogne Franche-Comté (région 2016) [Termes IGN] diamètre à hauteur de poitrine [Termes IGN] écorce [Termes IGN] Fagus sylvatica [Termes IGN] Grand Est (région 2016) [Termes IGN] inventaire forestier national (données France) [Termes IGN] modèle statistique [Termes IGN] Picea abies [Termes IGN] Pseudotsuga menziesii [Termes IGN] Quercus pedunculata [Termes IGN] Quercus sessiliflora [Termes IGN] volume (grandeur) [Vedettes matières IGN] Economie forestière
Résumé :	(auteur) Key message : A set of models of bark thickness at breast height and bark volume are now available for six species in France. A common model suitable for predicting bark volume was proposed for all species. A small but significant altitude effect on bark thickness at breast height was detected for three species. Context : The growing demand for wood energy and bio-molecules requires a thorough evaluation of forest biomass, particularly bark. Aims : The objective of this study is to have statistical models of bark volumes for the six main forest species present in North-Eastern France and to be able to estimate regional bark biomasses and quantities of chemical extractives at regional scale. Methods : A large databank gathering bark thickness measured at different heights in France was used for selecting literature or new alternative models of tree bark volume. These models were applied to the available forest inventory data from North-Eastern France to estimate the regional bark volume. Secondly, by multiplying these volumes by basic density data and extractive content recently obtained, bark biomasses and extractives quantities were deduced. Results : The first results consist in a set of species-specific models of bark thickness at breast height with R2 around 0.70 and a relative RMSE around 30% which is an improvement of 0.1 for R2 and of 1–2% for relative RMSE depending on the species compared to the best models from the literature. The second results consist in a set of species-specific models of tree bark volumes with R2 of 0.90 and a relative RMSE which varies between 22% when bark thickness at breast height is included and 40% when it is predicted. A significant relationship between bark thickness at breast height and altitude was also observed. The bark resources of Grand Est and Bourgogne-Franche-Comté regions were estimated at 558 000 m3/year and 611 000 m3/year respectively representing between 5.5% and 15% of the stem volume depending on the species. The propagation of the measurement error of bark gauge was estimated at 5% for model of bark thickness at breast height and 24% for bark volume model. Conclusion : These results constitute an important contribution for a better knowledge of the bark resource at a regional scale and may help to optimise bark valuation by the forest-wood sector.
Numéro de notice :	A2021-909
Affiliation des auteurs :	IGN+Ext (2020- )
Thématique :	FORET/MATHEMATIQUE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s13595-021-01096-7
Date de publication en ligne :	02/01/2022
En ligne :	https://doi.org/10.1007/s13595-021-01096-7
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=99458

Orogenic collapse and stress adjustments revealed by an intense seismic swarm following the 2015 Gorkha earthquake in Nepal / Lok Bijaya Adhikari in Frontiers in Earth Science, vol 9 (2021)

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[article]
inFrontiers in Earth Science > vol 9 (2021) . - n° 659937

Titre :	Orogenic collapse and stress adjustments revealed by an intense seismic swarm following the 2015 Gorkha earthquake in Nepal
Type de document :	Article/Communication
Auteurs :	Lok Bijaya Adhikari, Auteur ; Laurent Bollinger, Auteur ; Jérôme Vergne, Auteur ; Sophie Lambotte, Auteur ; Kristel Chanard , Auteur ; Marine Laporte, Auteur ; Lily Li, Auteur ; Bharat Koirala, Auteur ; Mukunda Bhattarai, Auteur ; Chintan Timsina, Auteur ; Nabina Bishwokarma, Auteur ; Nicolas Wendling-Vazquez, Auteur ; Frédéric Girault, Auteur ; Frédéric Perrier, Auteur
Année de publication :	2021
Projets :	1-Pas de projet / Deleuze, Christine
Article en page(s) :	n° 659937
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Géophysique interne [Termes IGN] effondrement de terrain [Termes IGN] Himalaya [Termes IGN] Népal [Termes IGN] séisme [Termes IGN] variation saisonnière
Résumé :	(auteur) The April 25, 2015 Mw 7.9 Gorkha earthquake in Nepal was characterized by a peak slip of several meters and persisting aftershocks. We report here that, in addition, a dense seismic swarm initiated abruptly in August 2017 at the western edge of the afterslip region, below the high Himalchuli-Manaslu range culminating at 8156 m, a region seismically inactive during the past 35 years. Over 6500 events were recorded by the Nepal National Seismological Network with local magnitude ranging between 1.8 and 3.7 until November 2017. This swarm was reactivated between April and July 2018, with about 10 times less events than in 2017, and in 2019 with only sporadic events. The relocation of swarm earthquakes using proximal temporary stations ascertains a shallow depth of hypocenters between the surface and 20 km depth in the High Himalayan Crystalline slab. This swarm reveals an intriguing localized interplay between orogenic collapse and stress adjustments, involving possibly CO2-rich fluid migration, more likely post-seismic slip and seasonal enhancements.
Numéro de notice :	A2021-788
Affiliation des auteurs :	UMR IPGP-Géod+Ext (2020- )
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.3389/feart.2021.659937
Date de publication en ligne :	22/07/2021
En ligne :	https://doi.org/10.3389/feart.2021.659937
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=98985

Integrated water vapour observations in the Caribbean arc from a network of ground-based GNSS receivers during EUREC4A / Olivier Bock in Earth System Science Data, vol 13 n° 5 (May 2021)

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[article]
inEarth System Science Data > vol 13 n° 5 (May 2021) . - pp 2407 - 2436

Titre :	Integrated water vapour observations in the Caribbean arc from a network of ground-based GNSS receivers during EUREC4A
Type de document :	Article/Communication
Auteurs :	Olivier Bock , Auteur ; Pierre Bosser , Auteur ; Cyrille Flamant, Auteur ; Erik Doerflinger, Auteur ; Friedhelm Jansen, Auteur ; Romain Fagès , Auteur ; Sandrine Bony, Auteur ; Sabrina Schnitt, Auteur
Année de publication :	2021
Projets :	VEGAN / Bock, Olivier, EUREC4A / Bock, Olivier
Article en page(s) :	pp 2407 - 2436
Note générale :	bibliographie This work was supported by the CNRS program LEFE/INSU through the project VEGAN. The EUREC4A project was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 694768).
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Caraïbes [Termes IGN] données auxiliaires [Termes IGN] données GNSS [Termes IGN] données météorologiques [Termes IGN] erreur systématique [Termes IGN] humidité de l'air [Termes IGN] retard troposphérique zénithal [Termes IGN] teneur intégrée en vapeur d'eau
Résumé :	(auteur) Ground-based Global Navigation Satellite System (GNSS) measurements from nearly fifty stations distributed over the Caribbean Arc have been analysed for the period 1 January–29 February 2020 in the framework of the EUREC4A (Elucidate the Couplings Between Clouds, Convection and Circulation) field campaign. The aim of this effort is to deliver high-quality Integrated Water Vapour (IWV) estimates to investigate the moisture environment of mesoscale cloud patterns in the Tradewinds and their feedback on the large-scale circulation and energy budget. This paper describes the GNSS data processing procedures and assesses the quality of the GNSS IWV retrievals from four operational streams and one reprocessed research stream which is the main data set used for offline scientific applications. The uncertainties associated with each of the data sets, including the zenith tropospheric delay (ZTD) to IWV conversion methods and auxiliary data, are quantified and discussed. The IWV estimates from the reprocessed data set are compared to the Vaisala RS41 radiosonde measurements operated from the Barbados Cloud Observatory (BCO) and to the measurements from the operational radiosonde station at Grantley Adams international airport (GAIA). A significant dry bias is found in the GAIA humidity observations with respect to the BCO sondes (−2.9 kg m−2) and the GNSS results (−1.2 kg m−2). A systematic bias between the BCO sondes and GNSS is also observed (1.7 kg m−2) where the Vaisala RS41 measurements are moister than the GNSS retrievals. The IWV estimates from a colocated microwave radiometer agree with the BCO soundings after an instrumental update on 27 January, while they exhibit a dry bias compared to the soundings and to GNSS before that date. IWV estimates from the ECMWF fifth generation reanalysis (ERA5) are overall close to the GAIA observations, probably due to the assimilation of these observations in the reanalysis. However, during several events where strong peaks in IWV occurred, ERA5 is shown to significantly underestimate the GNSS derived IWV peaks. Two successive peaks are observed on 22 January and 23/24 January which were associated with heavy rain and deep moist layers extending from the surface up to altitudes of 3.5 and 5 km, respectively. ERA5 significantly underestimates the moisture content in the upper part of these layers. The origins of the various moisture biases are currently being investigated. We classified the cloud organisation for five representative GNSS stations across the Caribbean Arc and found that the environment of Fish cloud patterns to be moister than that of Flowers cloud patterns which, in turn, is moister than the environment of Gravel cloud patterns. The differences in the IWV means between Fish and Gravel were assessed to be significant. Finally, the Gravel moisture environment was found to be similar to that of clear, cloud-free conditions. The moisture environment associated with the Sugar cloud pattern has not been assessed because it was hardly observed during the first two months of 2020. The reprocessed ZTD and IWV data set from 49 GNSS stations used in this study are available from the AERIS data center (https://doi.org/10.25326/79; Bock (2020b)).
Numéro de notice :	A2021-172
Affiliation des auteurs :	UMR IPGP-Géod+Ext (2020- )
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.5194/essd-13-2407-2021
Date de publication en ligne :	24/02/2021
En ligne :	http://dx.doi.org/10.5194/essd-13-2407-2021
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=97213

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3-Publications IGN 2020

Vous pouvez trier les références avec le bouton [a-z]

Global Climate [in “State of the Climate in 2019"] / A. Ades in Bulletin of the American Meteorological Society, vol 101 n° 8 (August 2020)

Public

[article]
inBulletin of the American Meteorological Society > vol 101 n° 8 (August 2020) . - pp S9 - S128

Titre :	Global Climate [in “State of the Climate in 2019"]
Type de document :	Article/Communication
Auteurs :	A. Ades, Auteur ; R. Adler, Auteur ; et al., Auteur ; Olivier Bock , Auteur
Année de publication :	2020
Projets :	1-Pas de projet / Bock, Olivier
Article en page(s) :	pp S9 - S128
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Atmosphère [Termes IGN] changement climatique [Termes IGN] circulation atmosphérique [Termes IGN] climat terrestre [Termes IGN] cryosphère [Termes IGN] données météorologiques [Termes IGN] gaz à effet de serre [Termes IGN] humidité de l'air [Termes IGN] humidité du sol [Termes IGN] précipitation [Termes IGN] sécheresse [Termes IGN] température de l'air
Résumé :	(auteur) [introduction] The assessments and analyses presented in this chapter focus predominantly on the measured differences of climate and weather observables from previous conditions, years, and decades to place 2019 in context. Many of these differences have direct impacts on people, for example, their health and environment, as well as the wider biosphere, but are beyond the scope of these analyses. For the last few State of the Climate reports, an update on the number of warmer-than-average years has held no surprises, and this year is again no different. The year 2019 was among the three warmest years since records began in the mid-to-late 1800s. Only 2016, and for some datasets 2015, were warmer than 2019; all years after 2013 have been warmer than all others back to the mid-1800s. Each decade since 1980 has been successively warmer than the preceding decade, with the most recent (2010–19) being around 0.2°C warmer than the previous (2000–09). This warming of the land and ocean surface is reflected across the globe. For example, lake and permafrost temperatures have increased; glaciers have continued to lose mass, becoming thinner for the 32nd consecutive year, with the majority also becoming shorter during 2019. The period during which Northern Hemisphere (NH) lakes were covered in ice was seven days shorter than the 1981–2010 long-term average, based on in situ phenological records. There were fewer cool extremes and more warm extremes on land; regions including Europe, Japan, Pakistan, and India all experienced heat waves. More strong than moderate marine heat waves were recorded for the sixth consecutive year. And in Australia (discussed in more detail in section 7h4), moisture deficits and prolonged high temperatures led to severe impacts during late austral spring and summer, including devastating wildfires. Smoke from these wildfires was detected across large parts of the Southern Hemisphere (SH). [...]
Numéro de notice :	A2020-798
Affiliation des auteurs :	UMR IPGP-Géod+Ext (2020- )
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1175/BAMS-D-20-0104.1
Date de publication en ligne :	12/08/2020
En ligne :	https://doi.org/10.1175/BAMS-D-20-0104.1
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=96582

Assessing forest availability for wood supply in Europe / Iciar A. Alberdi in Forest policy and economics, vol 111 (February 2020)

Public

[article]
inForest policy and economics > vol 111 (February 2020) . - n° 102032

Titre :	Assessing forest availability for wood supply in Europe
Type de document :	Article/Communication
Auteurs :	Iciar A. Alberdi, Auteur ; Susann Bender, Auteur ; Thomas Riedel, Auteur ; Valerio Avitable, Auteur ; Olivier Bouriaud , Auteur ; Michal Bosela, Auteur ; Andrea Camia, Auteur ; Isabel Canellas, Auteur ; F. Castro Rego, Auteur ; Christoph Fischer, Auteur ; Alexandra Freudenschuss, Auteur ; Jonas Fridman, Auteur ; Patrizia Gasparini, Auteur ; Thomas Gschwantner, Auteur ; Silvia Guerrero, Auteur ; Bjarki Kjartansson, Auteur ; Miloš Kučera, Auteur ; Adrian Lanz, Auteur ; Gheorghe Marin, Auteur ; Sarah Mubareka, Auteur ; Monica Notarangelo, Auteur ; Leonia Nunes, Auteur ; Benoit Pesty , Auteur ; et al., Auteur
Année de publication :	2020
Projets :	3-projet - voir note / Bock, Olivier
Article en page(s) :	n° 102032
Note générale :	bibliographie This research was supported by the Specific contract n. 18 “Use of National Forest Inventories data to estimate area and above ground biomass in European forests not available for wood supply” in the context of the Framework contract for the provision of forest data and services supporting the European Forest Data Centre 2012/ S 78-127532 of 21/04/2012 of the Joint Research Centre of the European Commission; the EG-013-72 agreement of the Ministry of Agriculture, Fisheries and Food (MAPA) and the INIA belonging to the Spanish Ministry of Science and Innovation (MICINN); and the project No. APVV-15-0265 granted by the Slovak Research and Development Agency.
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] biomasse aérienne [Termes IGN] biomasse forestière [Termes IGN] inventaire forestier étranger (données) [Termes IGN] ressources forestières [Termes IGN] Union Européenne [Termes IGN] volume en bois [Vedettes matières IGN] Inventaire forestier
Résumé :	(auteur) The quantification of forests available for wood supply (FAWS) is essential for decision-making with regard to the maintenance and enhancement of forest resources and their contribution to the global carbon cycle. The provision of harmonized forest statistics is necessary for the development of forest associated policies and to support decision-making. Based on the National Forest Inventory (NFI) data from 13 European countries, we quantify and compare the areas and aboveground dry biomass (AGB) of FAWS and forest not available for wood supply (FNAWS) according to national and reference definitions by determining the restrictions and associated thresholds considered at country level to classify forests as FAWS or FNAWS. FAWS represent between 75 and 95 % of forest area and AGB for most of the countries in this study. Economic restrictions are the main factor limiting the availability of forests for wood supply, accounting for 67 % of the total FNAWS area and 56 % of the total FNAWS AGB, followed by environmental restrictions. Profitability, slope and accessibility as economic restrictions, and protected areas as environmental restrictions are the factors most frequently considered to distinguish between FAWS and FNAWS. With respect to the area of FNAWS associated with each type of restriction, an overlap among the restrictions of 13.7 % was identified. For most countries, the differences in the FNAWS areas and AGB estimates between national and reference definitions ranged from 0 to 5 %. These results highlight the applicability and reliability of a FAWS reference definition for most of the European countries studied, thereby facilitating a consistent approach to assess forests available for supply for the purpose of international reporting.
Numéro de notice :	A2020-870
Affiliation des auteurs :	IGN+Ext (2020- )
Thématique :	FORET
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1016/j.forpol.2019.102032
Date de publication en ligne :	10/11/2019
En ligne :	https://doi.org/10.1016/j.forpol.2019.102032
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=99487

Ancient forest statistics provide centennial perspective over the status and dynamics of forest area in France / Timothée Audinot in Annals of Forest Science, vol 77 n° 3 (September 2020)

Public

[article]
inAnnals of Forest Science > vol 77 n° 3 (September 2020) . - 24 p.

Titre :	Ancient forest statistics provide centennial perspective over the status and dynamics of forest area in France
Type de document :	Article/Communication
Auteurs :	Timothée Audinot , Auteur ; Holger Wernsdörfer, Auteur ; Jean-Daniel Bontemps , Auteur
Année de publication :	2020
Projets :	ARBRE / AgroParisTech
Article en page(s) :	24 p.
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] analyse diachronique [Termes IGN] carte forestière [Termes IGN] changement d'utilisation du sol [Termes IGN] forêt de haute futaie [Termes IGN] forêt privée [Termes IGN] forêt publique [Termes IGN] France (administrative) [Termes IGN] politique forestière [Termes IGN] surface forestière [Termes IGN] taillis [Vedettes matières IGN] Inventaire forestier
Résumé :	(auteur) Key message: Centenary forest statistics informing major attributes of French forests were digitized, checked for consistency, and used to infer forest dynamics. Comparison to forest inventory data highlights increases in forest area and tree diversity, and substantial maturation of forests. Dataset access at https://doi.org/10.5281/zenodo.3739458 Context: The history of European forest dynamic remains fragmental. In France, the Daubrée statistics (1908) and agricultural statistics (1892, 1929) formed fundamental material to fill this gap. Aims: Release, test, and summarize the digitalized dataset. Analyze long-term forest changes in forest area, composition, and structure. Methods: Primary data on forest area across NUTS-3 geographic units, split by forest management and ownership categories and dominating tree species (Daubrée), were digitized and cross-compared. Centennial changes in forest attributes were assessed from modern forest inventory data. Results: Cross-comparison revealed: (1) strong temporal consistency in forest changes over time, (2) systematic and interpretable biases in ownership/management categories between Daubrée and agricultural statistics. Strong shift from coppices to high forests, increased prevalence of private ownership, and constant proportion of broadleaf- and conifer-dominated forests were highlighted, with increased tree species diversity at country scale. Conclusion: Ancient statistics are shown to play a major role in retrospective land-use and forest policy analysis.
Numéro de notice :	A2020-593
Affiliation des auteurs :	LIF+Ext (2012-2019)
Autre URL associée :	vers HAL ouvert
Thématique :	FORET
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s13595-020-00987-5
Date de publication en ligne :	05/08/2020
En ligne :	https://hal.science/hal-03317972v1
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=95928

Semi-kinematic geodetic reference frame based on the ITRF2014 for Malaysia / M. Azhari in Journal of geodetic science, vol 10 n° 1 (January 2020)

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[article]
inJournal of geodetic science > vol 10 n° 1 (January 2020) . - pp 91 - 109

Titre :	Semi-kinematic geodetic reference frame based on the ITRF2014 for Malaysia
Type de document :	Article/Communication
Auteurs :	M. Azhari, Auteur ; Zuheir Altamimi , Auteur ; G. Azman, Auteur ; M. Kadir, Auteur ; W.J.F. Simons, Auteur ; R. Sohaime, Auteur ; M.Y. Yunus, Auteur ; M.J. Irwan, Auteur ; C.A. Asyran, Auteur ; N. Soeb, Auteur ; A. Fahmi, Auteur ; A. Saiful, Auteur
Année de publication :	2020
Article en page(s) :	pp 91 - 109
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] coordonnées GNSS [Termes IGN] International Terrestrial Reference Frame [Termes IGN] Malaisie [Termes IGN] repère de référence [Termes IGN] réseau géodésique local [Termes IGN] série temporelle
Mots-clés libres :	MGRF2000 = Malaysia geodetic reference frame 2000 MGRF2020 = Malaysia geodetic reference frame 2020 GDM2020 = Geodetic datum of Malaysia 2020
Résumé :	(auteur) Malaysia is located at the stable part of the tectonic Sundaland platelet in SE Asia. The platelet is surrounded in almost every direction by tectonically active convergent boundaries, at which the Philippine Sea, the Australian and the Indian Plates are subducting respectively from the East, South and West. The current Malaysia geodetic reference frame called MGRF2000 is a static reference frame and hence did not incorporate the effects of plate motion and the ensuing deformation from (megathrust) earthquakes. To prevent degradation of Continuously Operating Reference Station (CORS) coordinates, a new time-dependent national reference frame was developed. Taking advantage of the availability of the GNSS data of the CORS network in Malaysia, notably the Malaysia Active GPS System (MASS) and Malaysia Real-Time Kinematic GNSS Network (MyRTKnet), a more accurate and robust Malaysian geodetic reference frame was determined, fully aligned and compatible with ITRF2014. The cumulative solution obtained from stacking Malaysian CORS position time series formed the basis of the new MGRF2020 realization. It consists of 100+ station positions at epoch 2020.0, station velocities and Post-Seismic Deformation (PSD) parametric models for stations subjected to major earthquakes. The (1999-2018) position time series exhibit Weighted Mean Root Square (WRMS) values of 3.0, 3.2 and 7.6 mm in respectively the East, North and Vertical components. A new semi-kinematic geodetic datum (GDM2020) for Malaysia, useable for GIS, mapping and cadastre applications is proposed to replace the existing static datum (GDM2000). A transformation suite to convert the spatial databases from GDM2000 to GDM2020 was also developed.
Numéro de notice :	A2020-878
Affiliation des auteurs :	UMR IPGP-Géod+Ext (2020- )
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1515/jogs-2020-0108
En ligne :	https://doi.org/10.1515/jogs-2020-0108
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=100056

Species richness influences the spatial distribution of trees in European forests / Cristina Bastias in Oikos, vol 129 n° 3 (March 2020)

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[article]
inOikos > vol 129 n° 3 (March 2020) . - pp 380 - 390

Titre :	Species richness influences the spatial distribution of trees in European forests
Type de document :	Article/Communication
Auteurs :	Cristina Bastias, Auteur ; Daniel Truchado, Auteur ; Fernando Valladares, Auteur ; Raquel Benavides, Auteur ; Olivier Bouriaud , Auteur ; et al., Auteur
Année de publication :	2020
Projets :	3-projet - voir note / AgroParisTech
Article en page(s) :	pp 380 - 390
Note générale :	bibliographie CCB is beneficiary of a FPU grant funded by the Spanish Government (AP2010-5600). This research was supported by the FunDivEUROPE project, receiving funding from the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement no.265171, the Spanish-funded project REMEDINAL TE-CM S2018/EMT-4338 and COMEDIAS FEDER/Ministerio de Ciencia, Innovación y Universidades – Agencia Estatal de Investigación/_Proyecto CGL2017-83170-R. RB was funded by a Marie Skłodowska-Curie Intra-European fellowship (grant agreement no. 302445).
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] distribution spatiale [Termes IGN] Europe (géographie politique) [Termes IGN] forêt tempérée [Termes IGN] peuplement mélangé [Termes IGN] richesse floristique [Termes IGN] structure d'un peuplement forestier [Vedettes matières IGN] Végétation et changement climatique
Résumé :	(auteur) The functioning of plant communities is strongly influenced by the number of species in the community and their spatial arrangement. This is because plants interact with their nearest neighbors and this interaction is expected to be stronger when the interacting individuals are ecologically similar in terms of resource use. Recent evidence shows that species richness alters the balance of intra‐versus interspecific competition, but the effect of species richness, and phylogenetic and functional diversity on the spatial pattern of the plant communities remain less studied. Even far, how forest stand structure derived from past management practices can influence the relationship between species richness and spatial pattern is still unknown. Here, we evaluate the spatial distribution of woody individuals (DBH >7.5 cm) in 209 forest stands (i.e. plots) with an increasing level of species richness (from 1 up to 10 species) in six forest types along a latitudinal gradient in Europe. We used completely mapped plots to investigate the spatial pattern in each forest stand with point pattern techniques. We fitted linear models to analyze the effect of species richness (positively correlated with phylogenetic diversity) and functional diversity on tree spatial arrangements. We also controled this relationship by forest type and stand structure as a proxy of the management legacy. Our results showed a generalized positive effect of species richness and functional diversity on the degree of spatial clustering of trees, and on the spatial independence of tree sizes regardless of the forest type. Moreover, current tree spatial arrangements were still conditioned by its history of management; however its effect was independent of the number of species in the community. Our study showed that species richness and functional diversity are relevant attributes of forests influencing the spatial pattern of plant communities, and consequently forest functioning.
Numéro de notice :	A2020-338
Affiliation des auteurs :	non IGN
Thématique :	BIODIVERSITE/FORET
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1111/oik.06776
Date de publication en ligne :	21/11/2019
En ligne :	https://doi.org/10.1111/oik.06776
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=96963

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4-Publications IGN 2019

Vous pouvez trier les références avec le bouton [a-z]

DIABOLO policy brief. Responding to European, national and regional challenges with harmonised forest information / Tuula Packalen (2019)

The conservation status assessment of Natura 2000 forest habitats in Europe: capabilities, potentials and challenges of national forest inventories data / Iciar A. Alberdi in Annals of Forest Science, vol 76 n° 2 (June 2019)

Public

[article]
inAnnals of Forest Science > vol 76 n° 2 (June 2019) . - n° 34

Titre :	The conservation status assessment of Natura 2000 forest habitats in Europe: capabilities, potentials and challenges of national forest inventories data
Type de document :	Article/Communication
Auteurs :	Iciar A. Alberdi, Auteur ; Leonia Nunes, Auteur ; Marko Kovac, Auteur ; Ingrid Bonhême , Auteur ; et al., Auteur
Année de publication :	2019
Projets :	DIABOLO / Packalen, Tuula
Article en page(s) :	n° 34
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] analyse comparative [Termes IGN] habitat (nature) [Termes IGN] habitat d'intérêt communautaire [Termes IGN] inventaire forestier étranger (données) [Termes IGN] inventaire forestier national (données France) [Termes IGN] politique de conservation (biodiversité) [Termes IGN] site Natura 2000 [Termes IGN] Union Européenne [Vedettes matières IGN] Ecologie forestière
Résumé :	(auteur) Context : There are differences among Member States as regards applying conservation status assessment and priorities according to the Directive on the conservation of natural habitats (Habitats Directive). Aims : This paper aims to analyse the consistency as regards forest habitat types reporting and the use and suitability of National Forest Inventories (NFIs) to assess their conservation status, as well as to provide recommendations for harmonised assessments through NFIs. Methods : A survey was carried out concerning the use of NFI data to report within the commitments of the Habitat Directive. The survey covered 13 European countries, accounting for 62% of forest habitat area. Additionally, case studies were carried out in four countries. Results : The identification of forest habitat types and the set of quantitative and/or qualitative indicators differ between countries. The use of NFI data is being considered in seven countries and it is expected to increase for the 2013–2018 reporting period. The main challenges reported of use of NFI data are related to the habitat identification and their mapping, and the monitoring frequency, design and costs (i.e. rare or small area habitats). Conclusion : It is necessary to improve the comparability of the conservation status assessments between countries.
Numéro de notice :	A2019-642
Affiliation des auteurs :	IGN+Ext (2012-2019)
Thématique :	FORET
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s13595-019-0820-4
Date de publication en ligne :	03/04/2019
En ligne :	https://doi.org/10.1007/s13595-019-0820-4
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=95998

Quantifying intra-annual dynamics of carbon sequestration in the forming wood: a novel histologic approach / Anjy Andrianantenaina in Annals of Forest Science, Vol 76 n° 3 (September 2019)

Public

[article]
inAnnals of Forest Science > Vol 76 n° 3 (September 2019) . - n° 62

Titre :	Quantifying intra-annual dynamics of carbon sequestration in the forming wood: a novel histologic approach
Type de document :	Article/Communication
Auteurs :	Anjy Andrianantenaina, Auteur ; Cyrille B.K. Rathgeber, Auteur ; Gonzalo Péres-de-Lis, Auteur ; Henri E. Cuny , Auteur ; Julien Ruelle, Auteur
Année de publication :	2019
Projets :	ARBRE / AgroParisTech
Article en page(s) :	n° 62
Note générale :	bibliographie This work was supported by a grant overseen by the French National Research Agency (ANR) as part of the “Investissements d’Avenir” program (ANR-11-LABX-0002-01, Lab of Excellence ARBRE), and by the National Institute of Agricultural Research (INRA Grand-Est Nancy) with a doctoral fellowship granted to the first author (CJS, “Contrat Jeune Scientifique”).
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] analyse d'image numérique [Termes IGN] Angiosperme [Termes IGN] biomasse aérienne [Termes IGN] croissance végétale [Termes IGN] densité du bois [Termes IGN] Hesse, forêt de (Meuse) [Termes IGN] microscope électronique [Termes IGN] Picea abies [Termes IGN] puits de carbone [Vedettes matières IGN] Végétation et changement climatique
Résumé :	(auteur) This study presents a novel histologic approach to quantify the intra-annual dynamics of carbon sequestration in forming wood. This innovative approach, based on repeated measurements of xylem apparent density, is more direct, and more accurate than the previously published cellular-based approach. Moreover, this new approach, which was tested here on softwoods, is also applicable to hardwoods without any modification. Context : Forest ecosystems are key players of the terrestrial carbon cycle. Indeed, wood represents the principal carbon pool of terrestrial biomass, accumulated in trees through cambial activity. Aims : Here, we present a novel, simple, and fast approach to accurately estimate the intra-annual dynamics of aboveground woody biomass production based on image analysis of forming xylem sections. Methods : During the 2015 growing season, we weekly collected wood samples (microcores) containing the forming xylem on seven Norway spruces (Picea abies (L.) Karst), grown in Hesse forest (North-East France). The microcores were prepared to allow the observation of the forming tissues with an optical microscope. Xylem apparent density and radial increment were then measured directly on images of the histological sections. In order to compare our “histologic approach” with the previously published “cellular approach,” we also counted the number of tracheids in each differentiation zones, and measured the tracheid dimensions all along the last-formed tree ring. Results : The two approaches yielded comparable meaningful results, describing xylem size increase and aboveground woody biomass production as bell-shaped curves culminating in May and June respectively. However, the histologic approach provided a shorter time lag between xylem size increase and biomass production than the cellular one. Conclusion : Better quantification of the shift between stem growth in size and in biomass will require addressing the knowledge gap regarding lignin deposition kinetics. Nevertheless, our novel histologic approach is simpler and more direct than the cellular one, and may open the way to a first quantification of intra-annual dynamics of woody biomass production in angiosperms, where the cellular approach is hardly applicable.
Numéro de notice :	A2019-650
Affiliation des auteurs :	IGN+Ext (2012-2019)
Thématique :	FORET
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s13595-019-0846-7
En ligne :	https://doi.org/10.1007/s13595-019-0846-7
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=97454

Vertical land motion in the Southwest and Central Pacific from available GNSS solutions and implications for relative sea levels / Valérie Ballu in Geophysical journal international, vol 218 n° 3 (September 2019)

Public

[article]
inGeophysical journal international > vol 218 n° 3 (September 2019) . - pp 1537 - 1551

Titre :	Vertical land motion in the Southwest and Central Pacific from available GNSS solutions and implications for relative sea levels
Type de document :	Article/Communication
Auteurs :	Valérie Ballu, Auteur ; Médéric Gravelle, Auteur ; Guy Wöppelmann , Auteur ; Olivier de Viron, Auteur ; Paul Rebischung , Auteur ; Mélanie Becker, Auteur ; Pierre Sakic-Kieffer, Auteur
Année de publication :	2019
Projets :	STORISK / Duvat, Virginie, TOSCA / Duvat, Virginie
Article en page(s) :	pp 1537 - 1551
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] déformation verticale de la croute terrestre [Termes IGN] données GNSS [Termes IGN] incertitude géométrique [Termes IGN] montée du niveau de la mer [Termes IGN] Pacifique ouest [Termes IGN] Pacifique Sud [Termes IGN] série temporelle
Résumé :	(auteur) Coastal populations are impacted by relative sea level variations, which consist both of absolute sea level variations and of vertical land motions. This paper focuses on the Southwest and Central Pacific region, a recognized vulnerable region to sea level rise and where a large range of vertical land motion dynamics is observed. We analyse vertical displacement rates obtained from Global Navigation Satellite Systems (GNSS) by different analysis centres. We study the role played by modelled parameters, such as step discontinuities (due to equipment changes, earthquakes, etc.), in the position time-series analysis. We propose a new modelling approach based on a joint inversion of GNSS position time-series from different analysis centres. The final uncertainty on the vertical land motion rates is estimated as a combination of the uncertainty due to the GNSS data processing itself and the uncertainty due to the stability of the reference frame in which the GNSS data are expressed. We find that the dominant trend in the Southwest and Central Pacific is a moderate subsidence, with an average rate of −1.1 mm yr–1, but significant variations are observed, with displacement rates varying from an uplift of 1.6 ± 0.3 mm yr–1 to a subsidence of −5.4 ± 0.3 mm yr–1. Taking into account the geodynamic context, we assess, for each station, the relevance of current estimates of linear vertical displacement rate and uncertainty for forecasting future coastal sea levels.
Numéro de notice :	A2019-634
Affiliation des auteurs :	Géodésie+Ext (mi2018-2019)
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1093/gji/ggz247
Date de publication en ligne :	27/05/2019
En ligne :	https://doi.org/10.1093/gji/ggz247
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=95452

Impact of humidity biases on light precipitation occurrence: observations versus simulations / Sophie Bastin in Atmospheric chemistry and physics, vol 19 n° 3 (February 2019)

Public

[article]
inAtmospheric chemistry and physics > vol 19 n° 3 (February 2019) . - pp 1471 - 1490

Titre :	Impact of humidity biases on light precipitation occurrence: observations versus simulations
Type de document :	Article/Communication
Auteurs :	Sophie Bastin, Auteur ; Philippe Drobinski, Auteur ; Marjolaine Chiriaco, Auteur ; Olivier Bock , Auteur ; Romain Roehrig, Auteur ; Clemente Gallardo, Auteur ; Dario Conte, Auteur ; Marta Domínguez Alonso, Auteur ; Laurent Li, Auteur ; Piero Lionello, Auteur ; Ana-Claudia Bernardes Parracho , Auteur
Année de publication :	2019
Projets :	HyMeX / Richard, Evelyne
Article en page(s) :	pp 1471 - 1490
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] bassin méditerranéen [Termes IGN] données GPS [Termes IGN] données météorologiques [Termes IGN] erreur systématique [Termes IGN] précipitation [Termes IGN] température de l'air [Termes IGN] teneur intégrée en vapeur d'eau
Résumé :	(auteur) This work uses a network of GPS stations over Europe from which a homogenized integrated water vapor (IWV) dataset has been retrieved, completed with colocated temperature and precipitation measurements over specific stations to (i) estimate the biases of six regional climate models over Europe in terms of humidity; (ii) understand their origins; and (iii) finally assess the impact of these biases on the frequency of occurrence of precipitation. The evaluated simulations have been performed in the framework of HYMEX/Med-CORDEX programs and cover the Mediterranean area and part of Europe at horizontal resolutions of 50 to 12 km. The analysis shows that models tend to overestimate the low values of IWV and the use of the nudging technique reduces the differences between GPS and simulated IWV. Results suggest that physics of models mostly explain the mean biases, while dynamics affects the variability. The land surface–atmosphere exchanges affect the estimation of IWV over most part of Europe, especially in summer. The limitations of the models to represent these processes explain part of their biases in IWV. However, models correctly simulate the dependance between IWV and temperature, and specifically the deviation that this relationship experiences regarding the Clausius–Clapeyron law after a critical value of temperature (Tbreak). The high spatial variability of Tbreak indicates that it has a strong dependence on local processes which drive the local humidity sources. This explains why the maximum values of IWV are not necessarily observed over warmer areas, which are often dry areas. Finally, it is shown over the SIRTA observatory (near Paris) that the frequency of occurrence of light precipitation is strongly conditioned by the biases in IWV and by the precision of the models to reproduce the distribution of IWV as a function of the temperature. The results of the models indicate that a similar dependence occurs in other areas of Europe, especially where precipitation has a predominantly convective character. According to the observations, for each range of temperature, there is a critical value of IWV from which precipitation starts to increase. The critical values and the probability of exceeding them are simulated with a bias that depends on the model. Those models, which generally present light precipitation too often, show lower critical values and higher probability of exceeding them.
Numéro de notice :	A2019-277
Affiliation des auteurs :	Géodésie+Ext (mi2018-2019)
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.5194/acp-19-1471-2019
Date de publication en ligne :	04/02/2019
En ligne :	https://doi.org/10.5194/acp-19-1471-2019
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=95383

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5-Publications IGN 2018

Vous pouvez trier les références avec le bouton [a-z]

All-sky search for long-duration gravitational wave transients in the first Advanced LIGO observing run / B.P. Abbott in Classical and Quantum Gravity, vol 35 n° 6 (March 2018)

Public

[article]
inClassical and Quantum Gravity > vol 35 n° 6 (March 2018) . - n° 065009

Titre :	All-sky search for long-duration gravitational wave transients in the first Advanced LIGO observing run
Type de document :	Article/Communication
Auteurs :	B.P. Abbott, Auteur ; R. Abbott, Auteur ; T.D. Abbott, Auteur ; et al., Auteur ; Olivier Bock , Auteur
Année de publication :	2018
Projets :	2-Pas d'info accessible - article non ouvert / Richard, Evelyne
Article en page(s) :	n° 065009
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] interféromètre au laser [Termes IGN] onde gravitationnelle [Termes IGN] relativité générale
Résumé :	(auteur) We present the results of a search for long-duration gravitational wave transients in the data of the LIGO Hanford and LIGO Livingston second generation detectors between September 2015 and January 2016, with a total observational time of 49~d. The search targets gravitational wave transients of 10–500 s duration in a frequency band of 24–2048 Hz, with minimal assumptions about the signal waveform, polarization, source direction, or time of occurrence. No significant events were observed. As a result we set 90% confidence upper limits on the rate of long-duration gravitational wave transients for different types of gravitational wave signals. We also show that the search is sensitive to sources in the Galaxy emitting at least ~10−8 M_{\odot} c^2 in gravitational waves.
Numéro de notice :	A2018-676
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Autre URL associée :	vers HAL
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1088/1361-6382/aaab76
Date de publication en ligne :	14/02/2018
En ligne :	https://doi.org/10.1088/1361-6382/aaab76
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=95884

The impact of rainfall distribution patterns on hydrological and hydraulic response in arid regions: case study Medina, Saudi Arabia / Mohamed Abdulrazzak in Arabian Journal of Geosciences, vol 11 n° 21 (November 2018)

Public

[article]
inArabian Journal of Geosciences > vol 11 n° 21 (November 2018) . - n° 679

Titre :	The impact of rainfall distribution patterns on hydrological and hydraulic response in arid regions: case study Medina, Saudi Arabia
Type de document :	Article/Communication
Auteurs :	Mohamed Abdulrazzak, Auteur ; Amro Elfeki, Auteur ; Ahmed Samy Kamis, Auteur ; Mostafa Kassab, Auteur ; Nassir Alamri, Auteur ; Kashif Noor, Auteur ; Anis Chaabani , Auteur
Année de publication :	2018
Projets :	2-Pas d'info accessible - article non ouvert / Richard, Evelyne
Article en page(s) :	n° 679
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Termes IGN] Arabie Saoudite [Termes IGN] inondation [Termes IGN] Médine [Termes IGN] modèle hydrographique [Termes IGN] précipitation [Termes IGN] zone aride
Résumé :	(auteur) Rainfall distribution patterns (RDPs) are crucial for hydrologic design. Hydrologic modeling is based on Soil Conservation Services (SCS) type RDPs (SCS type I, IA, II, and III). SCS type II method is widely used by hydrologists in arid regions. These RDPs were designed for the USA and similar temperate regions. There is no scientific justification for using SCS type II method in arid regions. The consequences of using SCS type II have impacts on the hydrologic and hydraulic modeling studies. The current paper investigates the validity of the SCS type II and in arid regions. New temporal RDPs were applied and compared with SCS type II RDPs. The produced peak discharges, volumes, maximum inundation depths, top widths, and velocities from both approaches were analyzed. An application is made on the protection channel in Taibah and Islamic Universities campuses in Medina, Saudi Arabia. A methodology was followed which included frequency analysis, catchment modeling, hydrological modeling, and hydraulic modeling. Results indicated that there are considerable consequences on infrastructural design, and hydrologic and hydraulic parameters if inappropriate RDPs are used. The investigation confirmed that the SCS type RDPs do not reflect the actual flood features in arid regions.
Numéro de notice :	A2018-668
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	GEOMATIQUE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s12517-018-4043-z
Date de publication en ligne :	08/11/2018
En ligne :	http://dx.doi.org/10.1007/s12517-018-4043-z
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=94265

Unsupervised detection of ruptures in spatial relationships in video sequences based on log‑likelihood ratio / Abdalbassir Abou-Elailah in Pattern Analysis and Applications, vol 21 n° 3 (August 2018)

Public

[article]
inPattern Analysis and Applications > vol 21 n° 3 (August 2018) . - pp 829 - 846

Titre :	Unsupervised detection of ruptures in spatial relationships in video sequences based on log‑likelihood ratio
Type de document :	Article/Communication
Auteurs :	Abdalbassir Abou-Elailah , Auteur ; Isabelle Bloch, Auteur ; Valérie Gouet-Brunet , Auteur
Année de publication :	2018
Projets :	1-Pas de projet / Richard, Evelyne
Article en page(s) :	pp 829 - 846
Note générale :	Bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement d'image optique [Termes IGN] détection d'événement [Termes IGN] distance (mathématique) [Termes IGN] histogramme [Termes IGN] modèle linéaire [Termes IGN] primitive [Termes IGN] relation spatiale [Termes IGN] séquence d'images
Résumé :	(Auteur) In this work, we propose a new approach to automatically detect ruptures in spatial relationships in video sequences, based on low-level primitives, in unsupervised manner. The spatial relationships between two objects of interest are modeled using angle and distance histograms as examples. The evolution of the spatial relationships during time is estimated from the distances between two successive angle or distance histograms and then considered as a temporal signal. The evolution of a spatial relationship is modeled by a linear Gaussian model. Then, two hypotheses “without change” and “with change” are considered, and a log-likelihood ratio is computed. The distribution of the log-likelihood ratio, given that H0 is true, is estimated and used to compute the p value. The comparison of this p value to a significance level 훼, expressing the probability of false alarms, allows us to detect significant ruptures in spatial relationships during time. In addition, this approach is generalized to detect multiple object events such as merging, splitting, and other events that contain ruptures in their spatial relationships evolution. This work shows that the description of spatial relationships across time is a promising step toward event detection.
Numéro de notice :	A2017-776
Affiliation des auteurs :	LASTIG MATIS+Ext (2012-2019)
Thématique :	IMAGERIE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s10044-017-0669-9
Date de publication en ligne :	18/11/2017
En ligne :	https://doi.org/10.1007/s10044-017-0669-9
Format de la ressource électronique :	URL Article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=88974

Comparison of total water vapour content in the Arctic derived from GNSS, AIRS, MODIS and SCIAMACHY / Dunya Alraddawi in Atmospheric measurement techniques, vol 11 n° 5 (May 2018)

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[article]
inAtmospheric measurement techniques > vol 11 n° 5 (May 2018) . - pp 2949 - 2965

Titre :	Comparison of total water vapour content in the Arctic derived from GNSS, AIRS, MODIS and SCIAMACHY
Type de document :	Article/Communication
Auteurs :	Dunya Alraddawi, Auteur ; Alain Sarkissian, Auteur ; Philippe Keckhut, Auteur ; Olivier Bock , Auteur ; Stefan Noël, Auteur ; Slimane Bekki, Auteur ; Abdanour Irbah, Auteur ; Mustapha Meftah, Auteur ; Chantal Claud, Auteur
Année de publication :	2018
Projets :	GNSS4SWEC / Richard, Evelyne, VEGAN / Bock, Olivier
Article en page(s) :	pp 2949 - 2965
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] analyse comparative [Termes IGN] Arctique [Termes IGN] Atmospheric Infrared Sounder [Termes IGN] données GNSS [Termes IGN] données météorologiques [Termes IGN] erreur systématique [Termes IGN] image Aqua-MODIS [Termes IGN] image Terra-MODIS [Termes IGN] nébulosité [Termes IGN] série temporelle [Termes IGN] teneur en vapeur d'eau
Résumé :	(auteur) Atmospheric water vapour plays a key role in the Arctic radiation budget, hydrological cycle and hence climate, but its measurement with high accuracy remains an important challenge. Total column water vapour (TCWV) datasets derived from ground-based GNSS measurements are used to assess the quality of different existing satellite TCWV datasets, namely from the Moderate Resolution Imaging Spectroradiometer (MODIS), the Atmospheric Infrared Sounder (AIRS) and the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY). The comparisons between GNSS and satellite data are carried out for three reference Arctic observation sites (Sodankylä, Ny-Ålesund and Thule) where long homogeneous GNSS time series of more than a decade (2001–2014) are available. We select hourly GNSS data that are coincident with overpasses of the different satellites over the three sites and then average them into monthly means that are compared with monthly mean satellite products for different seasons. The agreement between GNSS and satellite time series is generally within 5 % at all sites for most conditions. The weakest correlations are found during summer. Among all the satellite data, AIRS shows the best agreement with GNSS time series, though AIRS TCWV is often slightly too high in drier atmospheres (i.e. high-latitude stations during autumn and winter). SCIAMACHY TCWV data are generally drier than GNSS measurements at all the stations during the summer. This study suggests that these biases are associated with cloud cover, especially at Ny-Ålesund and Thule. The dry biases of MODIS and SCIAMACHY observations are most pronounced at Sodankylä during the snow season (from October to March). Regarding SCIAMACHY, this bias is possibly linked to the fact that the SCIAMACHY TCWV retrieval does not take accurately into account the variations in surface albedo, notably in the presence of snow with a nearby canopy as in Sodankylä. The MODIS bias at Sodankylä is found to be correlated with cloud cover fraction and is also expected to be affected by other atmospheric or surface albedo changes linked for instance to the presence of forests or anthropogenic emissions. Overall, the results point out that a better estimation of seasonally dependent surface albedo and a better consideration of vertically resolved cloud cover are recommended if biases in satellite measurements are to be reduced in the polar regions.
Numéro de notice :	A2018-240
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.5194/amt-11-2949-2018
Date de publication en ligne :	18/05/2018
En ligne :	https://doi.org/10.5194/amt-11-2949-2018
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=90215

The International Terrestrial Reference Frame: lessons from ITRF2014 / Zuheir Altamimi in Rendiconti Lincei. Scienze Fisiche e Naturali, vol 29 suppl 1 (June 2018)

Public

[article]
inRendiconti Lincei. Scienze Fisiche e Naturali > vol 29 suppl 1 (June 2018) . - 6 p.

Titre :	The International Terrestrial Reference Frame: lessons from ITRF2014
Type de document :	Article/Communication
Auteurs :	Zuheir Altamimi , Auteur ; Paul Rebischung , Auteur ; Laurent Métivier , Auteur ; Xavier Collilieux , Auteur
Année de publication :	2018
Projets :	1-Pas de projet / Bock, Olivier
Conférence :	SGPG 2017, Satellite Geodetic Positioning for Geosciences 08/03/2017 08/03/2017 Rome Italie
Article en page(s) :	6 p.
Note générale :	bibliographie This contribution is the written, peer-reviewed version of a paper presented at the Conference “Satellite Geodetic Positioning for Geosciences”, held at the Accademia Nazionale dei Lincei in Rome on March 8, 2017
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] International Terrestrial Reference Frame [Termes IGN] repère de référence
Résumé :	(auteur) We review the progress and continuous improvements being made since more than 30 years in the determination and development of the International Terrestrial Reference Frame (ITRF). We present the modeling innovations introduced in the ITRF2014 elaboration, mainly (1) the estimation of the annual and semi-annual signals embedded in the time series of station coordinates provided by the four space geodesy techniques, and (2) the incorporation of post-seismic deformation (PSD) models for sites subject to major earthquakes. We recall the rank deficiency problem in the ITRF combination model that is related to the specification of the ITRF defining parameters. We evaluate the precision and accuracy of the main ITRF2014 geodetic and geophysical products using some key performance indicators. We address some scientific questions of space geodesy contribution, via ITRF2014 results, to understand geophysical processes that affect the Earth system, such as earthquake displacements, tectonic motions and loading effects. We evaluate in particular the performance of estimating periodic signals versus applying a non-tidal atmospheric loading model. A particular emphasis is devoted to the level of agreement between techniques in terms of seasonal signals, frame physical parameters (origin and scale) and consistency with terrestrial local ties at co-location sites. Main conclusions are then drawn to guide and improve our analysis and combination strategy for future ITRF developments.
Numéro de notice :	A2018-202
Affiliation des auteurs :	LASTIG LAREG (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1007/s12210-017-0660-9
Date de publication en ligne :	21/12/2017
En ligne :	https://doi.org/10.1007/s12210-017-0660-9
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=89935

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6-Publications IGN 2017

Vous pouvez trier les références avec le bouton [a-z]

Enhanced MODIS atmospheric total water vapour content trends in response to Arctic amplification / Dunya Alraddawi in Atmosphere, vol 8 n° 12 (December 2017)

Public

[article]
inAtmosphere > vol 8 n° 12 (December 2017)

Titre :	Enhanced MODIS atmospheric total water vapour content trends in response to Arctic amplification
Type de document :	Article/Communication
Auteurs :	Dunya Alraddawi, Auteur ; Philippe Keckhut, Auteur ; Alain Sarkissian, Auteur ; Olivier Bock , Auteur ; Abdanour Irbah, Auteur ; Slimane Bekki, Auteur ; Chantal Claud, Auteur ; Mustapha Meftah, Auteur
Année de publication :	2017
Projets :	VEGAN / Bock, Olivier
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Arctique [Termes IGN] Arctique, océan [Termes IGN] changement climatique [Termes IGN] Groenland [Termes IGN] image Aqua-MODIS [Termes IGN] image Terra-MODIS [Termes IGN] modèle de simulation [Termes IGN] série temporelle [Termes IGN] Svalbard [Termes IGN] température de surface de la mer [Termes IGN] teneur en vapeur d'eau
Résumé :	(auteur) In order to assess the strength of the water vapour feedback within Arctic climate change, 15 years of the total column-integrated density of water vapour (TCWV) from the moderate resolution imaging spectrometer (MODIS) are analysed. Arctic TCWV distribution, trends, and anomalies for the 2001–2015 period, broken down into seasons and months, are analysed. Enhanced local spring TCWV trends above the terrestrial Arctic regions are discussed in relation to land snow cover and vegetation changes. Upward TCWV trends above the oceanic areas are discussed in lien with sea ice extent and sea surface temperature changes. Increased winter TCWV (up to 40%) south of the Svalbard archipelago are observed; these trends are probably driven by a local warming and sea ice extent decline. Similarly, the Barents/Kara regions underwent wet trends (up to 40%), also associated with winter/fall local sea ice loss. Positive late summer TCWV trends above the western Greenland and Beaufort seas (about 20%) result from enhanced upper ocean warming and thereby a local coastal decline in ice extent. The Mackenzie and Siberia enhanced TCWV trends (about 25%) during spring are found to be associated with coincident decreased snow cover and increased vegetation, as a result of the earlier melt onset. Results show drier summers in the Eurasia and western Alaska regions, thought to be affected by changes in albedo from changing vegetation. Other TCWV anomalies are also presented and discussed in relation to the dramatic decline in sea ice extent and the exceptional rise in sea surface temperature.
Numéro de notice :	A2017-858
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.3390/atmos8120241
Date de publication en ligne :	02/12/2017
En ligne :	https://doi.org/10.3390/atmos8120241
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=89835

ITRF2014 plate motion model / Zuheir Altamimi in Geophysical journal international, vol 209 n° 3 (June 2017)

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[article]
inGeophysical journal international > vol 209 n° 3 (June 2017) . - pp 1906 - 1912

Titre :	ITRF2014 plate motion model
Type de document :	Article/Communication
Auteurs :	Zuheir Altamimi , Auteur ; Laurent Métivier , Auteur ; Paul Rebischung , Auteur ; Hélène Rouby , Auteur ; Xavier Collilieux , Auteur
Année de publication :	2017
Projets :	1-Pas de projet / Bock, Olivier
Article en page(s) :	pp 1906 - 1912
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] déformation de la croute terrestre [Termes IGN] International Terrestrial Reference Frame [Termes IGN] modèle de déformation tectonique [Termes IGN] modèle de déplacement de plaque [Termes IGN] pôle de rotation [Termes IGN] rebond post-glaciaire [Termes IGN] station permanente [Termes IGN] vitesse [Termes IGN] vitesse de déplacement
Résumé :	(Auteur) For various geodetic and geophysical applications, users need to have access to a plate motion model (PMM) that is consistent with the ITRF2014 frame. This paper describes the approach used for determining a PMM from the horizontal velocities of a subset of the ITRF2014 sites away from plate boundaries, Glacial Isostatic Adjustment regions and other deforming zones. In theory, it would be necessary to include in the inversion model a translational motion vector (called in this paper origin rate bias, ORB) that would represent the relative motion between the ITRF2014 origin (long-term averaged centre of mass of the Earth as sensed by SLR) and the centre of tectonic plate motion. We show that in practice, the magnitude of the estimated ORB is strongly dependent on the selection of ITRF2014 sites used for the PMM adjustment. Its Z-component can in particular range between 0 and more than 1 mm yr−1 depending on the station network used, preventing any geophysical interpretation of the estimated value. Relying on rigorous statistical criteria, the site selection finally adopted for the ITRF2014-PMM adjustment leads to a relatively small ORB (0.30 ± 0.18 mm yr−1 in the Z-component), which is statistically insignificant at the 2-sigma level, but also according to an F-ratio test. Therefore we opted for an ITRF2014-PMM without estimating the ORB, which in turn accommodates geodetic applications that require access to the ITRF2014 frame through pure plate rotation poles.
Numéro de notice :	A2017-403
Affiliation des auteurs :	LASTIG LAREG (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1093/gji/ggx136
Date de publication en ligne :	30/03/2017
En ligne :	https://doi.org/10.1093/gji/ggx136
Format de la ressource électronique :	URL Article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=86077

Asymptotic behavior of the growth-fragmentation equation with bounded fragmentation rate / Etienne Bernard in Journal of functional analysis, vol 272 n° 8 (15 April 2017)

Public

[article]
inJournal of functional analysis > vol 272 n° 8 (15 April 2017) . - pp 3455 - 3485

Titre :	Asymptotic behavior of the growth-fragmentation equation with bounded fragmentation rate
Type de document :	Article/Communication
Auteurs :	Etienne Bernard , Auteur ; Pierre Gabriel, Auteur
Année de publication :	2017
Projets :	KIBORD / Bock, Olivier
Article en page(s) :	pp 3455 - 3485
Note générale :	Bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Analyse numérique [Termes IGN] analyse fonctionnelle (mathématiques) [Termes IGN] équation intégrale [Termes IGN] invariant
Résumé :	(Auteur) We are interested in the large time behavior of the solutions to the growth-fragmentation equation. We work in the space of integrable functions weighted with the principal dual eigenfunction of the growth-fragmentation operator. This space is the largest one in which we can expect convergence to the steady size distribution. Although this convergence is known to occur under fairly general conditions on the coefficients of the equation, we prove that it does not happen uniformly with respect to the initial data when the fragmentation rate in bounded. First we get the result for fragmentation kernels which do not form arbitrarily small fragments by taking advantage of the Dyson–Phillips series. Then we extend it to general kernels by using the notion of quasi-compactness and the fact that it is a topological invariant.
Numéro de notice :	A2017-779
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	MATHEMATIQUE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1016/j.jfa.2017.01.009
Date de publication en ligne :	31/01/2017
En ligne :	https://doi.org/10.1016/j.jfa.2017.01.009
Format de la ressource électronique :	URL Article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=88986

A derivation of the Vlasov–Navier–Stokes model for aerosol flows from kinetic theory / Etienne Bernard in Communications in Mathematical Sciences, vol 15 n° 6 ([01/09/2017])

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inCommunications in Mathematical Sciences > vol 15 n° 6 [01/09/2017] . - pp 1703 - 1741

Titre :	A derivation of the Vlasov–Navier–Stokes model for aerosol flows from kinetic theory
Type de document :	Article/Communication
Auteurs :	Etienne Bernard , Auteur ; Laurent Desvillettes, Auteur ; François Golse, Auteur ; Valeria Ricci, Auteur
Année de publication :	2017
Projets :	KIBORD / Bock, Olivier
Article en page(s) :	pp 1703 - 1741
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Mathématique [Termes IGN] aérosol [Termes IGN] champ de vitesse [Termes IGN] équation de Navier-Stokes [Termes IGN] flux [Termes IGN] gaz [Termes IGN] particule
Résumé :	(auteur) This article proposes a derivation of the Vlasov–Navier–Stokes system for spray/aerosol flows. The distribution function of the dispersed phase is governed by a Vlasov-equation, while the velocity field of the propellant satisfies the Navier–Stokes equations for incompressible fluids. The dynamics of the dispersed phase and of the propellant are coupled through the drag force exerted by the propellant on the dispersed phase. We present a formal derivation of this model from a multiphase Boltzmann system for a binary gaseous mixture, involving the droplets/dust particles in the dispersed phase as one species, and the gas molecules as the other species. Under suitable assumptions on the collision kernels, we prove that the sequences of solutions to the multiphase Boltzmann system converge to distributional solutions to the Vlasov-Navier–Stokes equation in some appropriate distinguished scaling limit. Specifically, we assume (a) that the mass ratio of the gas molecules to the dust particles/droplets is small, (b) that the thermal speed of the dust particles/droplets is much smaller than that of the gas molecules and (c) that the mass density of the gas and of the dispersed phase are of the same order of magnitude. The class of kernels modelling the interaction between the dispersed phase and the gas includes, among others, elastic collisions and inelastic collisions of the type introduced in [F. Charles: in “Proceedings of the 26th International Symposium on Rarefied Gas Dynamics”, AIP Conf. Proc. 1084:409–414, 2008].
Numéro de notice :	A2017-823
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	MATHEMATIQUE
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.4310/CMS.2017.v15.n6.a11
Date de publication en ligne :	28/06/2017
En ligne :	http://dx.doi.org/10.4310/CMS.2017.v15.n6.a11
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=89276

Semi-parametric segmentation of multiple series using a DP-Lasso strategy / Karine Bertin in Journal of Statistical Computation and Simulation, vol 87 n° 6 (2017)

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[article]
inJournal of Statistical Computation and Simulation > vol 87 n° 6 (2017) . - pp 1255 - 1268

Titre :	Semi-parametric segmentation of multiple series using a DP-Lasso strategy
Type de document :	Article/Communication
Auteurs :	Karine Bertin, Auteur ; Xavier Collilieux , Auteur ; Emilie Lebarbier, Auteur ; Christian Meza, Auteur
Année de publication :	2017
Projets :	3-projet - voir note / Bock, Olivier
Article en page(s) :	pp 1255 - 1268
Note générale :	bibliographie This work was supported by FONDECYT [grant numbers 1141256 and 1141258]; ANILLO [grant number ACT-1112]; MATH-AmSud [grant number 16-MATH-03]; SIDRE and CONICYT [grant number 870100003].
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Géodésie [Termes IGN] données géodésiques [Termes IGN] estimation statistique [Termes IGN] itération [Termes IGN] programmation dynamique [Termes IGN] segmentation
Résumé :	(auteur) We consider a semi-parametric approach to perform the joint segmentation of multiple series sharing a common functional part. We propose an iterative procedure based on Dynamic Programming for the segmentation part and Lasso estimators for the functional part. Our Lasso procedure, based on the dictionary approach, allows us to both estimate smooth functions and functions with local irregularity, which permits more flexibility than previous proposed methods. This yields to a better estimation of the functional part and improvements in the segmentation. The performance of our method is assessed using simulated data and real data from agriculture and geodetic studies. Our estimation procedure results to be a reliable tool to detect changes and to obtain an interpretable estimation of the functional part of the model in terms of known functions.
Numéro de notice :	A2017-870
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	MATHEMATIQUE/POSITIONNEMENT
Nature :	Article
nature-HAL :	ArtAvecCL-RevueIntern
DOI :	10.1080/00949655.2016.1260726
Date de publication en ligne :	30/11/2016
En ligne :	https://doi.org/10.1080/00949655.2016.1260726
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=89907

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7-Publications IGN 2016

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Propagation des ondes électromagnétiques dans l’atmosphère terrestre / Jonathan Chenal (2016)

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Titre :	Propagation des ondes électromagnétiques dans l’atmosphère terrestre : Cycle des Ingénieurs de Première Année
Type de document :	Guide/Manuel
Auteurs :	Jonathan Chenal , Auteur
Editeur :	Saint-Mandé : Institut national de l'information géographique et forestière - IGN
Année de publication :	2016
Collection :	Publications techniques en géodésie
Sous-collection :	Cours et conférences num. 28570
Importance :	229 p.
Format :	21 x 30 cm
Langues :	Français (fre)
Descripteur :	[Vedettes matières IGN] Physique [Termes IGN] analyse vectorielle [Termes IGN] atmosphère terrestre [Termes IGN] corps noir [Termes IGN] diffusion du rayonnement [Termes IGN] électromagnétisme [Termes IGN] onde électromagnétique [Termes IGN] radiométrie [Termes IGN] rayonnement électromagnétique [Termes IGN] réfraction atmosphérique [Termes IGN] transfert radiatif
Index. décimale :	24.30 Rayonnement électromagnétique
Résumé :	(auteur) [avant-propos] [...] Ce cours est d’abord et avant tout un cours de physique du rayonnement, qui prend pour base l’électromagnétisme classique décrit par les équations de Maxwell, et jette les bases de l’électromagnétisme quantique nécessaires `a la compréhension des principaux phénomènes abordées. L’accent a été mis sur les démonstrations des résultats fondamentaux, qui permettent d’ancrer solidement les concepts sous-jacents aux notions abordées. Les applications traitées touchent, dans le cadre de ce document, `a l’astronomie, la géodésie, la topométrie et la télédétection, qui concernent directement les étudiants de l’ENSG, tout en permettant de les élargir `a d’autres domaines. Ainsi, tous les phénomènes liés `a la propagation du rayonnement dans l’atmosphère ne sont pas abordés ici.
Note de contenu :	Introduction Partie 1 Outils fondamentaux de l’électromagnétisme 1 Analyse vectorielle 2 Postulats de l’électromagnétisme Partie 2 Propriétés des ondes électromagnétiques 3 Ondes électromagnétiques 4 Radiométrie Partie 3 Interactions des ondes électromagnétiques avec la matière 5 Le corps noir : approche quantique de l’émission et de l’absorption des ondes électromagnétiques 6 Électromagnétisme des milieux 7 Diffusion et transfert radiatif Partie 4 Ondes électromagnétiques dans l’atmosphère 8 Propriétés de l’atmosphère terrestre 9 Réfraction et transfert radiatif atmosphérique 10 Observer dans et à travers l’atmosphère terrestre Conclusion Partie 5 Annexes 11 Exercices
Numéro de notice :	17473
Affiliation des auteurs :	IGN (2012-2019)
Thématique :	IMAGERIE/POSITIONNEMENT
Nature :	Manuel de cours IGN
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=89714

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Propagation des ondes électromagnétiques dans l’atmosphère terrestre

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Mesures de positionnement de la frontière franco-suisse réalisées en 2016 / Alain Coulomb (2016)

ITRF co-location site survey at Kitab, Uzbekistan / Marion Gaudon (2016)

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Titre :	ITRF co-location site survey at Kitab, Uzbekistan
Type de document :	Rapport
Auteurs :	Marion Gaudon, Auteur
Mention d'édition :	version 1
Editeur :	Saint-Mandé : Institut national de l'information géographique et forestière - IGN
Année de publication :	2016
Collection :	Publications techniques en géodésie
Sous-collection :	Rapports techniques num. 28581
Importance :	60 p.
Format :	21 x 30 cm
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] co-positionnement [Termes IGN] International Terrestrial Reference Frame [Termes IGN] Ouzbékistan [Termes IGN] point de liaison (géodésie) [Termes IGN] station DORIS [Termes IGN] station GNSS [Termes IGN] station Regina
Résumé :	(auteur) The ITRF2014 (latest) realization of the International Terrestrial Reference System computed by the Laboratoire de Recherche en Géodésie (LAREG) at IGN is the result of the combination of reference frame from four space geodesy techniques (i.e. DORIS, GNSS, SLR and VLBI). One way to realize one common frame consists in adding results in the combination from local ties at co-location sites. A DORIS station and a permanent GNSS station, part of the IGS network, are installed at Kitab's observatory (Uzbekistan). This report describes the local tie survey carried out in June 2016, following the installation of the GNSS station and the relocation of the DORIS station.
Numéro de notice :	17456
Affiliation des auteurs :	IGN (2012-2019)
Thématique :	POSITIONNEMENT
Nature :	Rapport de mission
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=89672

Documents numériques

ITRF co-location site survey at Kitab, Uzbekistan

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La forêt en chiffres et en cartes / Institut national de l'information géographique et forestière (2012 -) (2016)

La forêt en chiffres et en cartes : Le mémento 2016

Les indicateurs de gestion durable des forêts françaises métropolitaines, édition 2015, Tome 1. Résultats / Institut national de l'information géographique et forestière (2012 -) (2016)

indicateurs de gestion durable 2015- Résultats

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8-Publications IGN 2015

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Détermination GNSS de bornes de la frontière de la Guyane française dans le cadre du « raid des 7 bornes », version 1 / Samuel Branchu (2015)

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Titre :	Détermination GNSS de bornes de la frontière de la Guyane française dans le cadre du « raid des 7 bornes », version 1
Type de document :	Rapport
Auteurs :	Samuel Branchu, Auteur
Mention d'édition :	Version 1
Editeur :	Saint-Mandé : Institut national de l'information géographique et forestière - IGN
Année de publication :	2015
Collection :	Publications techniques en géodésie
Sous-collection :	Rapports techniques num. 28547
Importance :	10 p.
Format :	21 x 30 cm
Langues :	Français (fre)
Descripteur :	[Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] Bernese [Termes IGN] borne géodésique [Termes IGN] Brésil [Termes IGN] délimitation de frontière [Termes IGN] Guyane française [Termes IGN] positionnement par GNSS [Termes IGN] réseau géodésique français de Guyane 1995
Résumé :	(auteur) Ce document présente les calculs GNSS réalisés à l'IGN pour déterminer les coordonnées de bornes observées dans le cadre du « raid des 7 bornes » pour la délimitation de la frontière terrestre entre le Brésil et la Guyane française, dirigé par François-Michel Le Tourneau, directeur de recherche au CNRS.
Note de contenu :	1. Introduction 2. Les sessions d'observations GNSS 3. Les traitements 3.1. Données de référence 3.2. Paramétrage du Bernese pour une session 4. les résultats 4.1. Qualité des observations et des résultats 4.2. Coordonnées RGFG95
Numéro de notice :	19736
Affiliation des auteurs :	IGN (2012-2019)
Thématique :	POSITIONNEMENT
Nature :	Rapport de mission
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=84076

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Détermination GNSS de bornes de la frontière de la Guyane française dans le cadre du « raid des 7 bornes »

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Rapport d’activité 2010-2014 du service de recherche en sciences de l’information géographique [SRSIG] / Bénédicte Bucher (2015)

Jonctions effectuées en 2015 entre les réseaux de nivellement français et allemand / Alain Coulomb (2015)

Ascension ITRF co-location site survey, version 1 / Thomas Donal (2015)

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Titre :	Ascension ITRF co-location site survey, version 1
Type de document :	Rapport
Auteurs :	Thomas Donal, Auteur
Mention d'édition :	version 1
Editeur :	Saint-Mandé : Institut national de l'information géographique et forestière - IGN
Année de publication :	2015
Collection :	Publications techniques en géodésie
Sous-collection :	Comptes rendus num. 28564
Importance :	65 p.
Format :	21 x 30 cm
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] co-positionnement [Termes IGN] International Terrestrial Reference Frame [Termes IGN] positionnement par DORIS [Termes IGN] positionnement par GNSS [Termes IGN] station permanente
Résumé :	(auteur) La réalisation ITRF2014 (dernière en date) de l’International Terrestrial Reference System calculée par le Laboratoire de Recherche en Géodésie (LAREG) de l’IGN est le résultat de la combinaison des référentiels terrestres issus des quatre techniques de géodésie spatiale (c’est à dire DORIS, GNSS, SLR et VLBI). Pour réaliser un repère unique, un moyen consiste à ajouter dans la combinaison les résultats de rattachements sur des sites co-localisés. La station de poursuite de l'ESA sur l'île de l'Ascension (Royaume-Uni) dispose d'une station DORIS et d'une station GNSS permanente, intégrée dans le réseau de l’IGS. Le présent rapport décrit le rattachement de précision réalisé sur ce site en juillet 2015 suite à l'installation d'une station GNSS REGINA.
Note de contenu :	1. Introduction 2. Co-location site description 3. Site survey description 4. Computation 5. Results 6. Appendixes
Numéro de notice :	19718
Affiliation des auteurs :	IGN (2012-2019)
Thématique :	POSITIONNEMENT
Nature :	Rapport de mission
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=84046

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Futuna ITRF site co-location survey, version 1 / Thomas Donal (2015)

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Titre :	Futuna ITRF site co-location survey, version 1
Type de document :	Rapport
Auteurs :	Thomas Donal, Auteur
Mention d'édition :	Version 1
Editeur :	Saint-Mandé : Institut national de l'information géographique et forestière - IGN
Année de publication :	2015
Collection :	Publications techniques en géodésie
Sous-collection :	Rapports techniques num. 28517
Importance :	90 p.
Format :	21 x 30 cm
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] co-positionnement [Termes IGN] rattachement de station [Termes IGN] Regina [Termes IGN] station DORIS [Termes IGN] station GNSS [Termes IGN] station permanente [Termes IGN] station Regina [Termes IGN] Wallis et Futuna
Résumé :	(auteur) La réalisation ITRF2008 (dernière en date de l’International Terrestrial Reference System) calculée par le Laboratoire de Recherche en Géodésie (LAREG) de l’IGN est le résultat de la combinaison des référentiels terrestres issus des quatre techniques de géodésie spatiale (c’est à dire GNSS, SLR, DORIS et VLBI). Pour réaliser un repère unique, un moyen consiste à ajouter dans la combinaison les résultats de rattachements sur des sites co-localisés. La station météorologique de Futuna ( Polynésie Française) dispose d'une station DORIS et d'une station GNSS permanente, intégrée dans le réseau de l’IGS. Le présent rapport décrit le rattachement de précision réalisé en mai 2012 sur ce site suite à l'installation d'une station GNSS REGINA et la rénovation de la station DORIS .
Note de contenu :	1. Introduction 2. Co-location site description 3. Survey description 4. Computation 5. Results 6. Appendixes
Numéro de notice :	19733
Affiliation des auteurs :	IGN (2012-2019)
Thématique :	POSITIONNEMENT
Nature :	Rapport de mission
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Publications de nos chercheurs

SALT: A multifeature ensemble learning framework for mapping urban functional zones from VGI data and VHR images / Hao Wu in Computers, Environment and Urban Systems, vol 100 (March 2023)

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[article]
inComputers, Environment and Urban Systems > vol 100 (March 2023) . - n° 101921

Titre :	SALT: A multifeature ensemble learning framework for mapping urban functional zones from VGI data and VHR images
Type de document :	Article/Communication
Auteurs :	Hao Wu, Auteur ; Wenting Luo, Auteur ; Anqi Lin, Auteur ; Fanghua Hao, Auteur ; Ana-Maria Olteanu-Raimond , Auteur ; Lanfa Liu, Auteur ; Yan Li, Auteur
Année de publication :	2023
Projets :	1-Pas de projet / Bock, Olivier
Article en page(s) :	n° 101921
Note générale :	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)
Descripteur :	[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

GENESIS: co-location of geodetic techniques in space / Pacôme Delva in Earth, Planets and Space, vol 75 n° 1 (2023)

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[article]
inEarth, Planets and Space > vol 75 n° 1 (2023) . - n° 5 (2023)

Titre :	GENESIS: co-location of geodetic techniques in space
Type de document :	Article/Communication
Auteurs :	Pacôme Delva, Auteur ; Zuheir Altamimi , Auteur ; et al., Auteur ; Laurent Métivier , Auteur
Année de publication :	2023
Article en page(s) :	n° 5 (2023)
Note générale :	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)
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

Missing the city for buildings? A critical review of pan-scalar map generalization and design in contemporary zoomable maps / Maieul Gruget in International journal of cartography, vol inconnu (2023)

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[article]
inInternational journal of cartography > vol inconnu (2023)

Titre :	Missing the city for buildings? A critical review of pan-scalar map generalization and design in contemporary zoomable maps
Type de document :	Article/Communication
Auteurs :	Maieul Gruget, Auteur ; Guillaume Touya , Auteur ; Ian Muehlenhaus, Auteur
Année de publication :	2023
Projets :	LostInZoom / Touya, Guillaume
Note générale :	bibliographie
Langues :	Anglais (eng)
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

Precipitation frequency in Med-CORDEX and EURO-CORDEX ensembles from 0.44° to convection-permitting resolution: impact of model resolution and convection representation / Minh Ha-Truong in Climate Dynamics, vol 60 n° inconnu (2023)

Public

[article]
inClimate Dynamics > vol 60 n° inconnu (2023)

Titre :	Precipitation frequency in Med-CORDEX and EURO-CORDEX ensembles from 0.44° to convection-permitting resolution: impact of model resolution and convection representation
Type de document :	Article/Communication
Auteurs :	Minh Ha-Truong, Auteur ; Sophie Bastin, Auteur ; Philippe Drobinski, Auteur ; Lluis Fita, Auteur ; Jan Polcher, Auteur ; Olivier Bock , Auteur ; et al., Auteur
Année de publication :	2023
Projets :	3-projet - voir note / Touya, Guillaume
Note générale :	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)
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

Voir aussi

Precipitation frequency in MED and EURO-CORDEX ensembles from 0.44° to convective permitting resolution: Impact of model resolution and convection representation / Minh Ha-Truong (2022)

The ULR-repro3 GPS data reanalysis and its estimates of vertical land motion at tide gauges for sea level science / Médéric Gravelle in Earth System Science Data, vol 15 n° inconnu (2023)

Public

[article]
inEarth System Science Data > vol 15 n° inconnu (2023)

Titre :	The ULR-repro3 GPS data reanalysis and its estimates of vertical land motion at tide gauges for sea level science
Type de document :	Article/Communication
Auteurs :	Médéric Gravelle, Auteur ; Guy Wöppelmann , Auteur ; Kevin Gobron, Auteur ; Zuheir Altamimi , Auteur ; Mikaël Guichard, Auteur ; Thomas Herring, Auteur ; Paul Rebischung , Auteur
Année de publication :	2023
Note générale :	bibliographie
Langues :	Anglais (eng)
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-2022-235
En ligne :	https://doi.org/10.5194/essd-2022-235
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=102521

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