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The ‘urban’ component of the French Land Data and Services Centre (Theia) / Anne Puissant (2019)  

Public Titre : The ‘urban’ component of the French Land Data and Services Centre (Theia) Type de document : Article/Communication Auteurs : Anne Puissant, Auteur ; Arnaud Sellé, Auteur ; Nicolas Baghdadi, Auteur ; Vincent Thierion, Auteur ; Arnaud Le Bris , Auteur ; Jean-Louis Roujean, Auteur Editeur : New York : Institute of Electrical and Electronics Engineers IEEE Année de publication : 2019 Projets : 2-Pas d'info accessible - article non ouvert / Conférence : JURSE 2019, Joint Urban Remote Sensing Event 22/05/2019 24/05/2019 Vannes France Proceedings IEEE Importance : 4 p. Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] image aérienne [Termes IGN] image spatiale Résumé : (auteur) The THEIA data and services centre has been created with the objective of increasing the use of space data by the scientific community and the public actors. THEIA structured the French scientific community 1) through a mutualized Service and Data Infrastructure (SDI) distributed between several centers, allowing access to a variety of products; 2) through the setup of Regional Animation Networks (RAN) to federate and animate users (scientists and public / private actors) and 3) through Scientific Expertise Centres (SEC) clustering virtual research groups on a thematic domain. The research works carried out for urban studies in three SEC are presented in this paper. The works are organized around the design and development of value-added products and services. Numéro de notice : C2019-003 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1109/JURSE.2019.8808998 Date de publication en ligne : 22/08/2019 En ligne : https://doi.org/10.1109/JURSE.2019.8808998 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92208

The Theia land data centre / Nicolas Baghdadi (2015)  

Public Titre : The Theia land data centre Type de document : Article/Communication Auteurs : Nicolas Baghdadi, Auteur ; Selma Cherchali, Auteur ; Jean-François Faure, Auteur ; Marc Leroy, Auteur ; Pierre Maurel, Auteur ; Jean-Louis Roujean, Auteur ; Magali Stoll, Auteur Editeur : Antony [France] : Institut national de recherche en sciences et technologies pour l’environnement et l’agriculture IRSTEA (2012-2019) Année de publication : 2015 Conférence : MeTMed 2015, 5th International Conference on Meteorology and Climatology of the Mediterranean 02/03/2015 04/03/2015 Istanbul Turquie Proceedings IEEE Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] image satellite Résumé : (auteur) Nine French public institutions involved in Earth Observation, environmental studies and scientific research (CEA, CNES, Cirad, CNRS, IGN, INRA, IRD, Irstea and Météo-France), have launched in 2012 the Theia Land Data Centre, pooling their expertise and resources to make satellite data available to the environmental research community and to public policy actors. The Theia primary mission is (i) to build a national space data infrastructure able to produce value-added space data over land and provide services fitted to users’ needs, (ii) to support the sharing of experience and scientific knowledge on methodologies relevant to process and use space data for land thematic issues. To this end, Theia is working to produce data, products, methods and services linked to space observations of continental areas, from local (ecosystem and territory) to global scale, and make them available to the user community. It is backed up by a distributed spatial data infrastructure (SDI), and by scientific expertise hubs in various regions. The SDI links Montpellier (GEOSUD at Maison de la Télédétection) and Toulouse (CNES supported by the CESBIO laboratory, and IGN). The SDI provides already through its portal (www.theia-land.fr) a number of satellite products : yearly coverages at high resolution over the French territory with Spot and Rapid Eye, results from the Take 5 – Spot 4 experiment over 45 sites wordwide from February to June 2013 to simulate Sentinel-2 imagery, time series of orthorectified, atmospherically corrected Landsat data over France. Much more is to come : a first batch of 100 000 images over areas worldwide from the Spot World Heritage programme, provided free of charge for non commercial users, time series of river and lakes height worldwide, atmospherically corrected and monthly composites of Sentinel-2 data over an area equivalent to that of Europe, a new climate record of vegetal variables at global scale with AVHRR, and others. The organisation of science expertise hubs at national level has been initiated. A number of science teams have been created with the goal to prepare processing lines of value added satellite products, in particular from the Sentinel satellites, such as land cover, watered areas, snow areas, imperviousness areas, albedo, vegetal variables at decametric scale, water quality and height, and others. Numéro de notice : C2015-063 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans En ligne : https://hal.science/hal-02601335 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98521

Spectral normalisation and fusion of optical sensors for the retrieval of BRDF and albedo: application to vegetation, MODIS, and MERIS data sets / O. Samain in IEEE Transactions on geoscience and remote sensing, vol 44 n° 11 Tome 1 (November 2006)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 44 n° 11 Tome 1 (November 2006) . - pp 3166 - 3179 Titre : Spectral normalisation and fusion of optical sensors for the retrieval of BRDF and albedo: application to vegetation, MODIS, and MERIS data sets Type de document : Article/Communication Auteurs : O. Samain, Auteur ; Bernhard Geiger, Auteur ; Jean-Louis Roujean, Auteur Année de publication : 2006 Article en page(s) : pp 3166 - 3179 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] Afrique occidentale [Termes IGN] albedo [Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes IGN] fusion d'images [Termes IGN] image à moyenne résolution [Termes IGN] image Envisat-MERIS [Termes IGN] image multicapteur [Termes IGN] image optique [Termes IGN] image SPOT-Végétation [Termes IGN] image Terra-MODIS [Termes IGN] série temporelle [Termes IGN] signature spectrale Résumé : (Auteur) This paper aims at demonstrating the possibility of merging data from various medium-resolution spaceborne sensors to produce a consistent time series of surface bidirectional reflectance distribution function (BRDF) and albedo products. The spectral, directional, temporal, and spatial aspects of the multisensor fusion are presented. Emphasis is then given on the spectral normalization for the fusion of Medium Resolution Imaging Spectrometer Instrument (MERIS) data with Moderate Resolution Imaging Spectroradiometer (MODIS) and VEGETATION (VGT) data. Two methods are evaluated: a simple statistical method, which relies on a linear regression using all the available spectral bands, and a more innovative method called the spectral mode method, which is based on the restitution of the surface spectral signature by a combination of universal spectral functions. Analysis with Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) hyperspectral data and satellite products reveals that the spectral mode method is more efficient. This approach is used to merge top-of-canopy bidirectional reflectances from MERIS and VGT for the restitution of BRDF and albedo over a subset of West Africa. Compared to the products obtained with MERIS alone, the fusion with VGT demonstrates an improvement of the spatial coverage and a reduction of product uncertainty by about a third. Copyright IEEE Numéro de notice : A2006-509 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2006.879545 En ligne : https://doi.org/10.1109/TGRS.2006.879545 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28233 [article]

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A land cover classification product over France at 1 km resolution using Spot4-Vegetation data / K.S. Han in Remote sensing of environment, vol 92 n° 1 (15 July 2004)  

Public [article]  inRemote sensing of environment > vol 92 n° 1 (15 July 2004) . - pp 52 - 66 Titre : A land cover classification product over France at 1 km resolution using Spot4-Vegetation data Type de document : Article/Communication Auteurs : K.S. Han, Auteur ; J.L. Champeaux, Auteur ; Jean-Louis Roujean, Auteur Année de publication : 2004 Article en page(s) : pp 52 - 66 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] analyse de groupement [Termes IGN] base de données d'occupation du sol [Termes IGN] Corine Land Cover [Termes IGN] image NOAA-AVHRR [Termes IGN] image SPOT-Végétation [Termes IGN] image Terra-MODIS [Termes IGN] occupation du sol Résumé : (Auteur) The present study focuses on the development of a new land cover classification product over France at 1 km resolution. It is based on data sets from the Earth observing system SPOT4/VEGETATION. The satellite measurements are aimed at supporting regional efforts to set up global mosaics on new land cover products. They have been acquired in the frame of the Global Land Cover 2000 project. The instrument design relies on advanced technology, which leads to an improved radiometric and geometric resolution data. Such characteristics allow taking full benefit of the daily repetitiveness of the VEGETATION wide field-of-view sensor without the drawback of a variable pixel size on the image edge. Several physical processing steps are successively operated to the images on a per-pixel basis to remove detector blindness, to filter cloud contamination, and finally to correct both atmospheric and surface anisotropy effects. A new thematic map using the K-means clustering method has been built. First, the results of the satellite-based land cover classification has been successfully compared with the Coordination of Information on the Environment (CORINE) database which serves as a reference to appraise the reliability of the study. Then, it has been inter-compared with land cover products derived from MODIS and AVHRR sensors. For this, an aggregative scheme particularly focused on major land units (forest, grassland, cropland) adopted in order to yield a whole mapping at the same geographic projection and space resolution. The discrepancies between maps enhance the quality of the proposed product, thanks to the use of advanced data processing and a more appropriate method. Numéro de notice : A2004-298 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.05.005 En ligne : https://doi.org/10.1016/j.rse.2004.05.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26825 [article]

Modélisation des effets bidirectionnels de la réflectances de surface pour la normalisation de données satellitaires de télédétection / Jean-Louis Roujean (1991)

Public Titre : Modélisation des effets bidirectionnels de la réflectances de surface pour la normalisation de données satellitaires de télédétection Type de document : Thèse/HDR Auteurs : Jean-Louis Roujean, Auteur ; M. Leroy, Directeur de thèse Editeur : Toulouse : Université de Toulouse 3 Paul Sabatier Année de publication : 1991 Importance : 172 p. Format : 21 x 30 cm Note générale : Bibliographie Thèse de doctorat, spécialité physique et chimie de l'environnement Langues : Français (fre) Descripteur : [Vedettes matières IGN] Rayonnement électromagnétique [Termes IGN] anisotropie [Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes IGN] image multitemporelle [Termes IGN] image POLDER [Termes IGN] rayonnement électromagnétique [Termes IGN] réflectance de surface [Termes IGN] réflectance végétale Index. décimale : THESE Thèses et HDR Numéro de notice : 45065 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse française Note de thèse : Thèse de doctorat : physique et chimie de l'environnement : Toulouse 3 : 1991 nature-HAL : Thèse DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=45524

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