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A worldwide 3D GCP database inherited from 20 years of massive multi-satellite observations / Laure Chandelier in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol V-2-2020 (August 2020)  

Public [article]  inISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences > vol V-2-2020 (August 2020) . - pp 15 - 23 Titre : A worldwide 3D GCP database inherited from 20 years of massive multi-satellite observations Type de document : Article/Communication Auteurs : Laure Chandelier , Auteur ; Laurent Coeurdevey, Auteur ; Sébastien Bosch, Auteur ; Pascal Favé, Auteur ; Roland Gachet, Auteur ; Alain Orsoni , Auteur ; Thomas Tilak , Auteur ; Alexis Barot, Auteur Année de publication : 2020 Projets : 1-Pas de projet / Conférence : ISPRS 2020, Commission 2, virtual Congress, Imaging today foreseeing tomorrow 31/08/2020 02/09/2020 Nice (en ligne) France Annals Commission 2 Article en page(s) : pp 15 - 23 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] base de données d'images [Termes IGN] compensation par bloc [Termes IGN] données localisées de référence [Termes IGN] formatage [Termes IGN] image à très haute résolution [Termes IGN] image multi sources [Termes IGN] image satellite [Termes IGN] image SPOT 6 [Termes IGN] image SPOT 7 [Termes IGN] image SPOT-HRS [Termes IGN] informatique en nuage [Termes IGN] Institut national de l'information géographique et forestière (France) [Termes IGN] point d'appui [Termes IGN] spatiotriangulation Résumé : (auteur) High location accuracy is a major requirement for satellite image users. Target performance is usually achieved thanks to either specific on-board satellite equipment or an auxiliary registration reference dataset. Both methods may be expensive and with certain limitations in terms of performance. The Institut national de l’information géographique et forestière (IGN) and Airbus Defence and Space (ADS) have worked together for almost 20 years, to build reference data for improving image location using multi-satellite observations. The first geometric foundation created has mainly used SPOT 5 High Resolution Stereoscopic (HRS) imagery, ancillary Ground Control Points (GCP) and Very High Resolution (VHR) imagery, providing a homogenous location accuracy of 10m CE90 almost all over the world in 2010. Space Reference Points (SRP) is a new worldwide 3D GCP database, built from a plethoric SPOT 6/7 multi-view archive, largely automatically processed, with cloud-based technologies. SRP aims at providing a systematic and reliable solution for image location (Unmanned Aerial Vehicle, VHR satellite imagery, High Altitudes Pseudo-Satellite…) and similar topics thanks to a high-density point distribution with a 3m CE90 accuracy. This paper describes the principle of SRP generation and presents the first validation results. A SPOT 6/7 smart image selection is performed to keep only relevant images for SRP purpose. The location of these SPOT 6/7 images is refined thanks to a spatiotriangulation on the worldwide geometric foundation, itself improved where needed. Points making up the future SRP database are afterward extracted thanks to classical feature detection algorithms and with respect to the expected density. Different filtering methods are applied to keep the best candidates. The last step of the processing chain is the formatting of the data to the delivery format, including metadata. An example of validation of SRP concept and specification on two tests sites (Spain and China) is then given. As a conclusion, the on-going production is shortly presented. Numéro de notice : A2020-474 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/isprs-annals-V-2-2020-15-2020 Date de publication en ligne : 03/08/2020 En ligne : https://doi.org/10.5194/isprs-annals-V-2-2020-15-2020 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95613 [article]

The new inteligence / Jonathan Shears in GEO: Geoconnexion international, vol 12 n° 10 (november – december 2013)

Public [article]  inGEO: Geoconnexion international > vol 12 n° 10 (november – december 2013) . - pp 20 - 21 Titre : The new inteligence Type de document : Article/Communication Auteurs : Jonathan Shears, Auteur Année de publication : 2013 Article en page(s) : pp 20 - 21 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] défense nationale [Termes IGN] image Pléiades-HR [Termes IGN] image SPOT 6 [Termes IGN] image SPOT 7 [Termes IGN] image SPOT-HRS [Termes IGN] modèle numérique de terrain [Termes IGN] orthoimage [Termes IGN] système d'information géographique Résumé : (Auteur) Low Earth-orbit satellites enable defence analysts to have good, current coverage of areas of interest. The author details a new geointelligence product that will take avantage of the improve capabilities of both Spot 6 and Spot 7 satellites. Numéro de notice : A2013-622 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32758 [article]

Exemplaires(1)

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Automatic cloud detection from multi-temporal satellite images: towards the use of Pléiades time series / Nicolas Champion (2012)  

Public contenu dans Proceedings, Commission 3, XXII ISPRS Congress, 25 August – 01 September 2012, Melbourne, Australia / M. Shortis (2012)   Titre : Automatic cloud detection from multi-temporal satellite images: towards the use of Pléiades time series Type de document : Article/Communication Auteurs : Nicolas Champion , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2012 Collection : International Archives of Photogrammetry and Remote Sensing, ISSN 0252-8231 num. 39-B3 Conférence : ISPRS 2012, Commission 3, 22th international congress 25/08/2012 01/09/2012 Melbourne Australie OA ISPRS Archives Commission 3 Importance : pp 559 - 564 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] détection des nuages [Termes IGN] image multitemporelle [Termes IGN] image Pléiades-HR [Termes IGN] image SPOT-HRS [Termes IGN] segmentation en régions Résumé : (auteur) Contrary to aerial images, satellite images are often affected by the presence of clouds. Identifying and removing these clouds is one of the primary steps to perform when processing satellite images, as they may alter subsequent procedures such as atmospheric corrections, DSM production or land cover classification. The main goal of this paper is to present the cloud detection approach, developed at the French Mapping agency. Our approach is based on the availability of multi-temporal satellite images (i.e. time series that generally contain between 5 and 10 images) and is based on a region-growing procedure. Seeds (corresponding to clouds) are firstly extracted through a pixel-to-pixel comparison between the images contained in time series (the presence of a cloud is here assumed to be related to a high variation of reflectance between two images). Clouds are then delineated finely using a dedicated region-growing algorithm. The method, originally designed for panchromatic SPOT5-HRS images, is tested in this paper using time series with 9 multi-temporal satellite images. Our preliminary experiments show the good performances of our method. In a near future, the method will be applied to Pléiades images, acquired during the in-flight commissioning phase of the satellite (launched at the end of 2011). In that context, this is a particular goal of this paper to show to which extent and in which way our method can be adapted to this kind of imagery. Numéro de notice : C2012-017 Affiliation des auteurs : LASTIG MATIS (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XXXIX-B3-559-2012 En ligne : http://dx.doi.org/10.5194/isprsarchives-XXXIX-B3-559-2012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94281

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

Toward a global bundle adjustment of SPOT 5 – HRS images / Stéphane Massera (2012)  

Public contenu dans Proceedings, Commission 1, XXII ISPRS Congress, 25 August – 01 September 2012, Melbourne, Australia / M. Shortis (2012)   Titre : Toward a global bundle adjustment of SPOT 5 – HRS images Type de document : Article/Communication Auteurs : Stéphane Massera , Auteur ; Pascal Favé, Auteur ; Roland Gachet, Auteur ; Alain Orsoni , 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-B1 Conférence : ISPRS 2012, Commission 1, 22th international congress 25/08/2012 01/09/2012 Melbourne Australie OA ISPRS Archives Commission 1 Importance : pp 251 - 256 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] compensation par bloc [Termes IGN] compensation par faisceaux [Termes IGN] image SPOT 5 [Termes IGN] image SPOT-HRS [Termes IGN] point d'appui [Termes IGN] points homologues [Termes IGN] spatiotriangulation [Termes IGN] SURF (algorithme) Résumé : (auteur) The HRS (High Resolution Stereoscopic) instrument carried on SPOT 5 enables quasi-simultaneous acquisition of stereoscopic images on wide segments – 120 km wide – with two forward and backward-looking telescopes observing the Earth with an angle of 20° ahead and behind the vertical. For 8 years IGN (Institut Géographique National) has been developing techniques to achieve spatiotriangulation of these images. During this time the capacities of bundle adjustment of SPOT 5 – HRS spatial images have largely improved. Today a global single block composed of about 20,000 images can be computed in reasonable calculation time. The progression was achieved step by step: first computed blocks were only composed of 40 images, then bigger blocks were computed. Finally only one global block is now computed. In the same time calculation tools have improved: for example the adjustment of 2,000 images of North Africa takes about 2 minutes whereas 8 hours were needed two years ago. To reach such a result a new independent software was developed to compute fast and efficient bundle adjustments. In the same time equipment – GCPs (Ground Control Points) and tie points – and techniques have also evolved over the last 10 years. Studies were made to get recommendations about the equipment in order to make an accurate single block. Tie points can now be quickly and automatically computed with SURF (Speeded Up Robust Features) techniques. Today the updated equipment is composed of about 500 GCPs and studies show that the ideal configuration is around 100 tie points by square degree. With such an equipment, the location of the global HRS block becomes a few meters accurate whereas non adjusted images are only 15 m accurate. This paper will describe the methods used in IGN Espace to compute a global single block composed of almost 20,000 HRS images, 500 GCPs and several million of tie points in reasonable calculation time. Many advantages can be found to use such a block. Because the global block is unique it becomes easier to manage the historic and the different evolutions of the computations (new images, new GCPs or tie points). The location is now unique and consequently coherent all around the world, avoiding steps and artifacts on the borders of DSMs (Digital Surface Models) and OrthoImages historically calculated from different blocks. No extrapolation far from GCPs in the limits of images is done anymore. Using the global block as a reference will allow new images from other sources to be easily located on this reference. Numéro de notice : C2012-016 Affiliation des auteurs : IGN (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XXXIX-B1-251-2012 Date de publication en ligne : 24/07/2012 En ligne : http://dx.doi.org/10.5194/isprsarchives-XXXIX-B1-251-2012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94280

Fusion de données topographiques pour la réalisation d'un modèle numérique de terrain : Application à la modélisation de la crue du Niger / Elodie Paris in XYZ, n° 128 (septembre - novembre 2011)

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New data sources for completing national topographic mapping of Northern Canada at 1:50,000 / D. Clavet in Geomatica, vol 65 n° 1 (March 2011)  

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Nouvelles cartographies au 1:200 000 du Sénégal et au 1:5 000 en Polynésie Française : deux exemples de production opérationnelle de cartes topographiques numériques à partir d'imagerie satellitaire / Dominique Lasselin in Le monde des cartes, n° 202 (décembre 2009) 

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An improved model for along track stereo sensors using rigorous orbit mechanics and navigation data / P. Michalis in Revue Française de Photogrammétrie et de Télédétection, n° 184 (Décembre 2006)  

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Accuracy analysis for DSM and orthoimages derived from SPOT HRS stereo data using direct georeferencing / Peter Reinartz in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 3 (May 2006)  

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DEM generation from SPOT-5 3-fold along track stereoscopic imagery using autocalibration / W. Kornus in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 3 (May 2006)  

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Generation of DSMs from SPOT-5 in-track HRS and across-track HRG stereo data using spatiotriangulation and autocalibration / Thierry Toutin in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 3 (May 2006)  

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Multi-image matching for DSM generation from Ikonos imagery / Li Zhang in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 3 (May 2006)  

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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)  

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Spatiotriangulation with multisensor HR stereo-images / Thierry Toutin in IEEE Transactions on geoscience and remote sensing, vol 44 n° 2 (February 2006)  

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