Centre dedocumentation
scientifique

Extracting precise and affordable DEMs despite of the clouds. Ajax: the joining of radar and optical strengths / Laurent Cunin (2012)  

Public Titre : Extracting precise and affordable DEMs despite of the clouds. Ajax: the joining of radar and optical strengths Type de document : Article/Communication Auteurs : Laurent Cunin , Auteur ; Philippe Nonin, Auteur ; Juergen Janoth, Auteur ; Marc Bernard, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2012 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 39-B4 Conférence : ISPRS 2012, Commission 4, 22th international congress 25/08/2012 01/09/2012 Melbourne Australie OA ISPRS Archives Commission 4 Importance : pp 271 - 274 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image mixte [Termes IGN] Colombie [Termes IGN] Congo [Termes IGN] Elevation30/Reference3D [Termes IGN] image SPOT-HRS [Termes IGN] image TerraSAR-X [Termes IGN] modèle numérique de surface [Termes IGN] nuage [Termes IGN] Référence-3D Résumé : (auteur) On the one hand, onboard SPOT 5, the HRS instrument systematically collects stereopairs around the Globe since 2002. Each stereopair can encompass an area up to 600 km x 120 km within a single pass (i.e. 72 000 km² stereoscopic strips). Covering now more than 120 millions sq.km of the Earth landmasses, SPOT 5 stereoscopic imagery has become one of main satellite data sources for accurate DEM extraction, at least where the cloud coverage leaves a chance to do so ! On the other hand, the TerraSAR-X satellite, launched in June 2007, is able to collect radar data through the clouds in several modes. An approach to extract height information by radargrammetry was developed, and the commercial distribution of Digital Elevation Models based on TerraSAR-X StripMap and SpotLight Modes (resp. 3m and 1m resolution) has started in 2010. To improve the overall height accuracy of the DEM, acquisitions from both orbit directions are utilised, each point on the ground being thus imaged at least 4 times by TerraSAR-X. Since 2002, Spot Image and French National Cartographic Institute (IGN) are building a worldwide database called Elevation30/Reference3D™, which includes a Digital Elevation Model at 1-arc-second resolution (DTED level 2) extracted from HRS stereopairs. To answer the wide demand of precise DEMs over Tropical and Northern areas, frequently covered by clouds, a study was performed to integrate StripMap radargrammetric TerraSAR-X data into the Reference3D process, and two prototype products were issued, over Colombia and Congo areas. During this experiment, efforts have been made to stick to technical steps that could be integrated within a standardized production process, in order to keep offering affordable prices while maintaining a high standard of horizontal and vertical accuracy. The DEMs extracted from TerraSAR-X and HRS proved extremely consistent with each other, showing a mean difference of 0.80m. This allows to propose a unified Elevation30 product to the users, with a guaranteed accuracy materialized into the product through a dedicated vertical Accuracy Commitment Mask. Numéro de notice : C2012-018 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XXXIX-B4-271-2012 Date de publication en ligne : 31/07/2012 En ligne : http://dx.doi.org/10.5194/isprsarchives-XXXIX-B4-271-2012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94283

Updating and improving the accuracy of a large 3D database through the careful use of GCPs and Icesat data : Example of REFERENCE3D / Emilie Le Hir in Journal of The Remote Sensing Society of Japan, vol 32 n° 1 (January 2012)    

Public [article]  inJournal of The Remote Sensing Society of Japan > vol 32 n° 1 (January 2012) . - pp 15 - 21 Titre : Updating and improving the accuracy of a large 3D database through the careful use of GCPs and Icesat data : Example of REFERENCE3D Type de document : Article/Communication Auteurs : Emilie Le Hir, Auteur ; Laurent Cunin , Auteur ; Marc Bernard, Auteur Année de publication : 2012 Article en page(s) : pp 15 - 21 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] données ICEsat [Termes IGN] image SPOT 5 [Termes IGN] image SPOT-HRG [Termes IGN] modèle numérique de surface [Termes IGN] point d'appui [Termes IGN] Référence-3D Résumé : (auteur) Onboard SPOT 5, the HRS instrument systematically collects 600 km × 120 km stereopairs around the Globe since 2002. From this time, SPOT5 stereoscopic imagery becomes one of main satellite data sources for accurate DTED level 2 DEM extraction. Spot Image and French National Cartographic Institute (IGN) decided in 2002 to build a worldwide accurate database called Reference3DTM using HRS data. Huge eorts have been made to standardize the process in order to oer aordable prices. Until 2008, the targeted accuracies were 16 mCE90 for horizontal accuracy, and 10 mLE90 for vertical accuracy. These accuracy requirements were achieved without any control points nor map support. The introduction of the paper briey reminds the most signicant assessments performed by major players within the geospatial community, and more specically the one by ImageONE Co., Ltd. (Tokyo) on two Reference3D geocells over the Northern coast of Japan, Hokkaido province. This work was published in 2008 during the last Beijing ISPRS congress. In 2009, it was decided to introduce reliable GCPs within the Reference3D production process, to increase the horizontal accuracy down to 6-10 mCE90. In addition, two new layers were added to the product, which provide the user with i) the horizontal accuracy for every single pixel of the Reference3D orthoimage and ii) the vertical accuracy for every single elevation value within the Reference3D DEM. The paper shows how the extensive use of ICESat data brings valuable information regarding the eective vertical accuracy, and how ICESat data allows to quantify the elevation accuracy of a dataset. In conclusion, we present the road map for the update of the whole Reference3D database, which currently spreads over more than 45 millions of sq. km. (being more than 4,200 1° by 1° geocells), already funded and started up to 2014, towards 80 Mkm2 of Reference3D products. Numéro de notice : A2012-746 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : 10.11440/rssj.32.15 Date de publication en ligne : 30/01/2012 En ligne : https://doi.org/10.11440/rssj.32.15 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91732 [article]

Documents numériques

en open access Updating and improving the accuracy ... - pdf éditeur Adobe Acrobat PDF

Updating and improving the accuracy of a large 3D database through the careful use of GCPs and Icesat data : Example of REFERENCE3D / Emilie Le Hir (2010)  

Public Titre : Updating and improving the accuracy of a large 3D database through the careful use of GCPs and Icesat data : Example of REFERENCE3D Type de document : Article/Communication Auteurs : Emilie Le Hir, Auteur ; Laurent Cunin , Auteur ; Marc Bernard, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2010 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 38-part8 Conférence : ISPRS 2010, Technical Commission 8 Symposium, Networking the World with Remote Sensing 02/08/2010 12/08/2010 Kyoto Japon ISPRS OA Archives Commission 8 Importance : pp 800 - 804 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] données ICEsat [Termes IGN] image SPOT 5 [Termes IGN] image SPOT-HRG [Termes IGN] modèle numérique de surface [Termes IGN] point d'appui [Termes IGN] Référence-3D Résumé : (auteur) Onboard SPOT 5, the HRS instrument systematically collects stereopairs around the Globe since 2002. Each stereopair can encompass an area up to 600 km x 120 km within a single pass (i.e. 72 000 km² stereoscopic strips). From this time, SPOT 5 stereoscopic imagery becomes one of main satellite data sources for accurate DEM extraction. Spot Image and French National Cartographic Institute (IGN) decided in 2002 to design and build a worldwide accurate database called Reference3D™ using HRS data. This database consists of three information layers: Digital Elevation Model at 1-arc-second resolution (DTED level 2), Orthoimage at 5m resolution and Quality Masks. Huge efforts have been made to standardize the process in order to offer affordable prices. Numéro de notice : C2010-035 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVIII/part8/pdf/W08L42_20100304211526.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91729

SPOT 5 HRS geometric performances: using block adjustment as a key issue to improve quality of DEM generation / Aurélie Bouillon in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 3 (May 2006)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 3 (May 2006) . - pp 134 - 146 Titre : SPOT 5 HRS geometric performances: using block adjustment as a key issue to improve quality of DEM generation Type de document : Article/Communication Auteurs : Aurélie Bouillon, Auteur ; Marc Bernard, Auteur ; Patrick Gigord, Auteur ; Alain Orsoni , Auteur ; Véronique Rudowski, Auteur ; Alain Baudoin , Auteur Année de publication : 2006 Article en page(s) : pp 134 - 146 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] base de données localisées 3D [Termes IGN] compensation par bloc [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] géoréférencement direct [Termes IGN] HRS (capteur) [Termes IGN] image SPOT-HRS [Termes IGN] modèle numérique de surface [Termes IGN] orthoimage [Termes IGN] précision géométrique (imagerie) [Termes IGN] stéréoscopie Résumé : (Auteur) HRS instrument on board of SPOT 5 allows acquisition of stereoscopic pairs in a single pass. Its final purpose is to provide the worldwide database of Digital Terrain Models and Orthoimages, called ReferenceSD®, with no use of ground control points and a horizontal location specified as 16 m for 90% of the points. The stake is not only to fulfil the HRS' location specification of 50 m in root mean square but to obtain a location performance as best as possible and to check that the instrument can cope with the realisation of the ReferenceSD® database. That's why HRS has been the subject of specific attention even after the end of SPOT 5 in-flight commissioning phase. This comprehensive paper summarizes the steps jointly taken by CNES, IGN, Spot Image and HRS end-users to calibrate, monitor and validate the HRS image accuracy as well as the accuracy of the final DEM products. First, an overview of HRS on SPOT 5 will be given, with a specific attention paid to the instrument geometry and rigorous sensor model available through ancillary data given with the images. Then, methods and means used by the French Space Agency (CNES) and the French Mapping Agency (IGN) to reach the objectives will be described and the final accuracy reached will be given. It concems: 1-- calibration and monitoring of the HRS geometrical parameters, and the several on board improvements brought to the satellite by CNES to improve the location accuracy at the single pair level (i.e. no tie points nor ground control points used); 2-- the HRS block adjustment model calibration and the evaluation performed by IGN at the stereo pair level (i.e with tie points used within the pair) and block level (with tie points used between different HRS strips). Finally, the article deals with several comparisons of HRS DEM's against available DEMs (eg. SRTM DTED level 2) and also reviews various evaluations of the HRS and the ReferenceSD® products made by independent users against ground truth issued from field measurements or high quality/high scale geodata. Copyright ISPRS Numéro de notice : A2006-225 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.03.002 Date de publication en ligne : 21/04/2006 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.03.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27952 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-06031	SL	Revue	Centre de documentation	Revues en salle	Disponible

Observation de la Terre : Les débuts difficiles mais prometteurs de la résolution sub-métrique optique / Alain Dupéret in Revue Française de Photogrammétrie et de Télédétection, n°173-174 (Juin 2004)

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n°173-174 (Juin 2004) . - pp 3 - 15 Titre : Observation de la Terre : Les débuts difficiles mais prometteurs de la résolution sub-métrique optique Type de document : Article/Communication Auteurs : Alain Dupéret , Auteur ; Michel Kasser , Auteur ; J.Y. Bacon, Auteur ; Marc Bernard, Auteur ; Alain Podaire, Auteur Année de publication : 2004 Conférence : SFPT 2003, Colloque Pixels et Cités 23/11/2003 12/08/2010 Champs-sur-Marne France ISPRS OA Archives Commission 8 Article en page(s) : pp 3 - 15 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] capteur en peigne [Termes IGN] chambre DTC [Termes IGN] image à résolution métrique [Termes IGN] image à résolution submétrique [Termes IGN] image aérienne [Termes IGN] image EROS [Termes IGN] image Ikonos [Termes IGN] image IRS [Termes IGN] image ORBVIEW [Termes IGN] image Pléiades-HR [Termes IGN] image Quickbird [Termes IGN] image SPOT-HRG [Termes IGN] image SPOT-HRS [Termes IGN] image SPOT-Végétation [Termes IGN] Orfeo Résumé : (Auteur) La communauté de l'imagerie aérienne et spatiale est en plein bouleversement suite à une évolution rapide du contexte international, un renforcement spectaculaire de la concurrence et une régulière progression technologique. L'apparition de satellites privés américains, alliant des objectifs de sécurité nationale et de leadership industriel, fortement soutenus par l'administration américaine, a ouvert de nouvelles perspectives en ouvrant la commercialisation de données satellitaires de résolution métrique. Depuis, de nombreux pays se dotent, ou vont le faire, de capacités d'observation régionale à vocation civile et militaire. En Europe, l'ESA montre sa volonté de participer à cette évolution tandis que le CNES, riche de 20 ans d'expérience de la filière SPOT, travaille activement au concept dual Pléiades qui prendra sa suite. Les caractéristiques intrinsèques des prises de vue aériennes et satellitales ne les mettent pas systématiquement en concurrence, mais montrent au contraire une certaine complémentarité dont l'utilisateur ne pourra que bénéficier. Numéro de notice : A2004-435 Affiliation des auteurs : ENSG+Ext (1941-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100448 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
018-04021	RAB	Revue	Centre de documentation	En réserve 3L	Disponible

Instrument HRS et MNT sur SPOT 5 / Marc Bernard in Bulletin [Société Française de Photogrammétrie et Télédétection], n°164-165 (Octobre 2001)

Permalink