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Documents disponibles écrits par cet auteur (8)
Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externesICARE: A physically-based model to correct atmospheric and geometric effects from high spatial and spectral remote sensing images over 3D urban areas / Sophie Lacherade in Meteorology and Atmospheric Physics, vol 102 n° 3-4 (December 2008)
Titre : ICARE: A physically-based model to correct atmospheric and geometric effects from high spatial and spectral remote sensing images over 3D urban areas Type de document : Article/Communication Auteurs : Sophie Lacherade, Auteur ; Christophe Miesch, Auteur ; Didier Boldo Année de publication : 2008 Article en page(s) : pp 209 - 222 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] correction d'image
[Termes IGN] image aérienne
[Termes IGN] image PELICAN
[Termes IGN] modèle de transfert radiatif
[Termes IGN] modèle physique
[Termes IGN] radiance
[Termes IGN] réflectance du sol
[Termes IGN] scène urbaine
[Termes IGN] Toulouse
[Termes IGN] zone urbaineRésumé : (auteur) Automatic mapping of urban materials from remotely sensed radiance images remains difficult because of the complex phenomena induced by relief. Indeed, shadows and environment effects disrupt the radiance reaching the sensor. The measured radiance also depends on the illumination conditions of the observed area. This paper describes a new physical model, ICARE, able to solve the radiative transfer inversion problem in urban areas, in the reflective domain (0.4–2.5 µm), from high spatial and spectral resolution images. This new approach takes into account the relief, the spatial heterogeneity of the scene and atmospheric effects, in order to extract rigorously the ground surface reflectance. The resolution method consists of modelling separately the irradiance and radiance components at ground and sensor levels. Three input data are required to solve this inverse problem: atmospheric parameters (aerosol type and visibility), 3D digital vector models of the scene, and spectral at-sensor calibrated images of the scene. The validation of ICARE is checked through the CAPITOUL field campaign, carried out over Toulouse (France). Measurements were performed using two airborne Pelican image systems consisting of 8 high spatial (20 cm) and spectral (30 nm) resolution cameras. Results are presented over typical urban structures in Toulouse center. ICARE performance is expected to be better than 0.04 in the reflectance retrieval, even in shadowed areas. To quantify the gain brought by ICARE, a comparison between classification based on radiance and retrieved reflectance images, obtained by inversion, is introduced. The results show that the classification is improved from 54% for a flat ground assumption to 74% using ICARE. Numéro de notice : A2008-658 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00703-008-0316-5 Date de publication en ligne : 20/10/2008 En ligne : http://dx.doi.org/10.1007/s00703-008-0316-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99552
in Meteorology and Atmospheric Physics > vol 102 n° 3-4 (December 2008) . - pp 209 - 222[article]
Titre : Development of an inversion code, ICARE, able to extract urban areas ground reflectance Type de document : Article/Communication Auteurs : Sophie Lacherade, Auteur ; Christophe Miesch, Auteur ; Didier Boldo Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2007 Collection : International Archives of Photogrammetry and Remote Sensing, ISSN 0252-8231 num. 36-7/C50 Conférence : ISPMSRS 2007, ISPRS Working Group VII/1 Workshop, Physical Measurements and Signatures in Remote Sensing 12/03/2007 14/03/2007 Davos Suisse ISPRS OA Archives Importance : 6 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] image aérienne
[Termes IGN] image PELICAN
[Termes IGN] modèle de transfert radiatif
[Termes IGN] modèle physique
[Termes IGN] radiance
[Termes IGN] réflectance du sol
[Termes IGN] Toulouse
[Termes IGN] zone urbaineRésumé : (auteur) Automatic mapping of urban materials from remotely sensed radiance images remains difficult because of the complex physical phenomena induced by relief. Indeed, shadows and environment effects disrupt the radiance incoming the sensor. Moreover, the measured radiance depends on the illumination conditions of the observed area. This is quite problematic for multi-temporal analysis. Images are often taken in different illumination conditions thus shadows are not located in the same place. This paper describes a new physical model, ICARE, able to solve the radiative transfer inversion problem over urban areas, in the reflective domain (0.4 μm – 2.5 μm), from high spatial and spectral resolution images. This new approach takes into account the complex relief of 3D structures, the spatial heterogeneity of the scene and atmospheric effects, in order to extract rigorously the ground surface reflectance, even in shadows areas. The resolution method consists in modelling separately the irradiance and radiance components at ground and sensor levels. The validation of ICARE is checked through the CAPITOUL trial, carried out in Toulouse (France, 2004). Measurements were performed using two airborne Pelican image systems consisting in 8 high spatial (20 cm) and spectral (30 nm) resolution cameras. Results are presented over typical urban structures in Toulouse center completed by an error budget. They demonstrate that extracted reflectances correspond very well to ground re flectance measurements. Moreover, there is a good continuity between reflectance obtained over sunny and shadowed materials. That proves that shadows areas and environment effects are well corrected. To quantify the gain brought by ICARE, a comparison between classification based on radiance and reflectance images, obtained by inversion, is introduced. Numéro de notice : C2007-041 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.isprs.org/proceedings/xxxvi/7-C50/papers/P13.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99562
Titre : An inverse radiative transfer model to extract ground spectral reflectance of urban areas Type de document : Article/Communication Auteurs : Sophie Lacherade, Auteur ; Christophe Miesch, Auteur ; Didier Boldo Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2006 Conférence : EARSEL 2006, 1st workshop of the EARSel Special Interest Group Urban Remote Sensing : Urban remote sensing, Challenges & Solutions 02/03/2006 03/03/2006 Berlin Allemagne ISPRS OA Archives Note générale : bibliographie
communication dans le cadre de sa thèse sous la direction d'Hervé Le MenLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] modèle de transfert radiatif
[Termes IGN] problème inverse
[Termes IGN] réflectance de surface
[Termes IGN] zone urbaineNuméro de notice : C2006-051 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Communication DOI : sans En ligne : http://recherche.ign.fr/labos/matis/pdf/articles_conf/2006/2006_earsel_lacherade [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103482
Titre : Spectral variability and bidirectional reflectance behaviour of urban materials at a 20 cm spatial resolution in the visible and near‐infrared wavelengths. A case study over Toulouse (France) Type de document : Article/Communication Auteurs : Sophie Lacherade, Auteur ; Christophe Miesch, Auteur ; Xavier Briottet Année de publication : 2005 Article en page(s) : pp 3859 - 3866 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] rayonnement lumineux
[Termes IGN] rayonnement proche infrarouge
[Termes IGN] réflectance directionnelle
[Termes IGN] réflectance urbaine
[Termes IGN] scène urbaine
[Termes IGN] Toulouse
[Termes IGN] zone urbaineRésumé : (auteur) This letter presents an experiment carried out in Toulouse in May 2004 to study the spectral variability and bidirectional reflectance behaviour of urban materials. The measurements were carried out at a 20 cm spatial resolution in the visible and near‐infrared (350–2500 nm). These measurements allow quantification of three main types of reflectance spatial variability. In addition to these in situ experiments, the bidirectional properties of urban material samples were studied in the laboratory with a goniometer. Numéro de notice : A2005-613 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160500177414 Date de publication en ligne : 12/04/2011 En ligne : https://doi.org/10.1080/01431160500177414 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99568
in International Journal of Remote Sensing IJRS > vol 26 n° 17 (September 2005) . - pp 3859 - 3866[article]Exemplaires(1)
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Titre : Analysis of the spectral variability of urban materials for classification : A case study over Toulouse (France) Type de document : Article/Communication Auteurs : Sophie Lacherade, Auteur ; Christophe Miesch, Auteur ; F. LemaÎtre, Auteur ; Xavier Briottet Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2005 Collection : International Archives of Photogrammetry and Remote Sensing, ISSN 0252-8231 num. 36-8/W27 Conférence : ISPRS 2005, WG VIII/1, Joint Symposia URBAN - URS 14/03/2005 16/03/2005 Tempe Arizona - Etats-Unis OA ISPRS Archives Importance : 3 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] bande visible
[Termes IGN] classification
[Termes IGN] image proche infrarouge
[Termes IGN] milieu urbain
[Termes IGN] réflectance spectrale
[Termes IGN] Toulouse
[Termes IGN] variabilitéRésumé : (auteur) The automatic classification of urban materials from airborne and spatial acquisitions remains difficult today because of two main reasons: the spatial resolution of the images and the need for pre-processing algorithms to extract ground surface intrinsic properties. This work examines the feasibility of using 8 spectral information distributed in the visible and the near-infrared spectral regions (0.4 - 1 μm), acquired at a 20 cm spatial resolution, for recognizing the urban materials. The motivation for this study is the development of very high spatial resolution sensors which has introduced a promising capability for the study of urban areas. In this study , an experiment campaign took place in Toulouse. The airborne measurements were carried out using 8 cameras associated with 8 narrow filters (30 nm). Ground spectral measurements of Toulouse's urban materials were performed within the configuration of the airborne acquisitions. These measurements allow us to determine and quantify three types of reflectance spatial variability. The results show that urban materials have low reflectances with no significant spectral features and are then difficult to discriminate. To determine which material classes could be discriminate over the 8 spectral bands of the airborne acquisitions, a statistical analysis was performed on the ground measurements. This analysis highlights that 5 material classes could be discriminated from good quality measurements. Numéro de notice : C2005-036 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/8-W27/lacherade.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100079
