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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)  

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]

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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)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 3 (May 2006) . - pp 147 - 159 Titre : DEM generation from SPOT-5 3-fold along track stereoscopic imagery using autocalibration Type de document : Article/Communication Auteurs : W. Kornus, Auteur ; R. Alamus, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 147 - 159 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] auto-étalonnage [Termes IGN] compensation par faisceaux [Termes IGN] erreur moyenne quadratique [Termes IGN] espace objet [Termes IGN] image SPOT-HRS [Termes IGN] modèle numérique de surface [Termes IGN] modèle numérique de terrain [Termes IGN] point d'appui [Termes IGN] précision du positionnement [Termes IGN] semis de points Résumé : (Auteur) This paper describes the derivation and accuracy assessment of Digital Elevation Models (DEM) from 3-fold along-track stereoscopic SPOT-5 imagery. The work was conducted in the scope of the HRS (Haute Resolution Stereoscopique)-Scientifïc Assessment Program, organized by the Centre National d'Etudes Spatiales (CNES) and the International Society of Photogrammetry and Remote Sensing (ISPRS). The orientation of the SPOT-5 image scene is reconstructed by bundle adjustment using ground control points. The functional model is based on correction polynomials and permits autocalibration. At 17 independent check points a RMS-error of 2 m was achieved. DEM are produced in two different ways: The more rigorous way employs an automatic region growing image matching process generating a dense point cloud in image space, transforms it into the object space using the estimated model parameters and converts it into a regular grid DEM. In a second approach the commercial software ISAE and rational functions are applied. The comparison with a digital terrain model (DTM) of superior accuracy yields standard deviations better than 5 m in flat and moderate terrain and better than 10 m in mountainous regions. With ISAE a DEM for the entire image area (approx. 60 x 80 km) is produced with a standard deviation of approximately 8 m. All grid points were generated fully automatically, i.e. the presented standard deviations still include the effect of large differences between the produced DEM and the DTM. Copyright ISPRS Numéro de notice : A2006-226 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2005.12.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2005.12.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27953 [article]

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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)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 3 (May 2006) . - pp 160 - 169 Titre : Accuracy analysis for DSM and orthoimages derived from SPOT HRS stereo data using direct georeferencing Type de document : Article/Communication Auteurs : Peter Reinartz, Auteur ; Rupert Müller, Auteur ; Manfred Lehner, Auteur ; Manfred Schroeder, Auteur Année de publication : 2006 Article en page(s) : pp 160 - 169 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] caméra numérique [Termes IGN] couple stéréoscopique [Termes IGN] géoréférencement direct [Termes IGN] image MOMS-2P [Termes IGN] image SPOT-HRS [Termes IGN] modèle numérique de surface [Termes IGN] orientation du capteur [Termes IGN] orthoimage [Termes IGN] point d'appui [Termes IGN] points homologues [Termes IGN] précision du positionnement Résumé : (Auteur) During the HRS (High Resolution Stereo) Scientific Assessment Program the French space agency CNES delivered data sets from the HRS camera System with high precision ancillary data. Two test data sets from this program were evaluated: one is located in Germany, the other in Spain. The first goal was to derive orthoimages and digital surface models (DSM) from the along track stereo data by applying the rigorous model with direct georeferencing and without ground control points (GCPs). For the derivation of DSM, the stereo processing software, developed at DLR for the MOMS-2P three line stereo camera was used. As a first step, the interior and exterior orientation of the camera, delivered as ancillary data from positioning and attitude Systems were extracted. A dense image matching, using nearly all pixels as kernel centers provided the parallaxes. The quality of the stereo lie points was controlled by forward and backward matching of the two stereo partners using the local least squares matching method. Forward intersection lead to points in object space which are subsequently interpolated to a DSM in a regular grid. DEM filtering methods were also applied and evaluations carried out differentiating between accuracies in forest and other areas. Additionally, orthoimages were generated from the images of the two stereo looking directions. The orthoimage and DSM accuracy was determined by using GCPs and available reference DEMs of superior accuracy (DEM derived from laser data and/or classical airborne photogrammetry). As expected the results obtained without using GCPs showed a bias in the order of 5-20 m to the reference data for ail three coordinates. By image matching it could be shown that the two independently derived orthoimages exhibit a very constant shift behaviour. In a second step few GCPs (3-4) were used to calculate bore-sight alignment angles, introduced into the direct georeferencing process of each image independently. This method improved the absolute accuracy of the resulting orthoimages and DSM significantly. Copyright ISPRS Numéro de notice : A2006-227 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2005.12.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2005.12.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27954 [article]

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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)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 3 (May 2006) . - pp 170 - 181 Titre : Generation of DSMs from SPOT-5 in-track HRS and across-track HRG stereo data using spatiotriangulation and autocalibration Type de document : Article/Communication Auteurs : Thierry Toutin , Auteur Année de publication : 2006 Article en page(s) : pp 170 - 181 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] analyse comparative [Termes IGN] auto-étalonnage [Termes IGN] données lidar [Termes IGN] erreur de mesure [Termes IGN] image SPOT-HRG [Termes IGN] image SPOT-HRS [Termes IGN] modèle numérique de terrain [Termes IGN] point d'appui [Termes IGN] précision du positionnement [Termes IGN] spatiotriangulation [Termes IGN] traitement d'image Résumé : (Auteur) Digital terrain models (DTMs) were extracted from SPOT-5 High Resolution Stereoscopic (HRS, 10m resolution) in-track stereo-images and High Resolution Geometric (HRG, 5m resolution) across-track stereo-images using a three-dimensional (3D) multisensor physical model developed at the Canada Centre for Remote Sensing, Natural Resources Canada, and were evaluated against precise lidar data. Firstly, the stereo HRS and HRG photogrammetric bundle block adjustments using spatiotriangulation and autocalibration were set-up with 10 ground control points and errors of about half-resolution were obtained over 190 and 95 independent checkpoints (ICPs): 6.4m, 6.8m and 5.1m in X, Y and Z axes, and 2.6m, 2.2m and 2.9m in X, Y and Z axes for HRS and HRG, respectively. The internal accuracy are, however, better because these errors include the half-pixel image plotting error and the 3m cartographic error on ICPs. Only the results with HRS were achieved with autocalibration of the lens to correct for the radial distortions due to the largest number of pixels. The DTMs were then generated using an area-based multi-scale image matching method and 3D semi-automatic editing tools, and then compared to lidar data with 0.2m accuracy in elevation. An elevation error with 68% confidence level (LE68) of 5.2m and 6.5m were achieved over the full area for HRS and HRG, respectively. Since the DTM is in fact a digital surface model where the height, or a part, of different land cover classes (trees, houses) is included, the accuracy is depending on the land cover types. Using previous 3D visual classification, different classes (forests, residential areas, bare surfaces) were generated to take into account the height of the surfaces (natural and human-made) in the accuracy evaluation. LE68 values of 3.2m to 6.7m were thus obtained depending on the land cover types. On the other hand, LE68 values of 2.4m and 2.2m were obtained over bare surfaces for HRS and HRG, respectively. These last results are more representative of the real stereo SPOT-5 potential for DTM, compliant with the highest topographic standard. Copyright ISPRS Numéro de notice : A2006-228 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.02.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.02.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27955 [article]

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Sensor orientation via RPCs / Clive Simpson Fraser 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 182 - 194 Titre : Sensor orientation via RPCs Type de document : Article/Communication Auteurs : Clive Simpson Fraser, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 182 - 194 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] compensation par bloc [Termes IGN] image à résolution métrique [Termes IGN] image Ikonos [Termes IGN] image Quickbird [Termes IGN] modèle par fonctions rationnelles [Termes IGN] modèle stéréoscopique [Termes IGN] orientation du capteur [Termes IGN] point d'appui Résumé : (Auteur) The adoption of rational functions as a preferred sensor orientation model for narrow field of view line scanner imagery accompanied the introduction of commercial high-resolution satellite imagery (HRSI) at the turn of the millennium. This paper reviews the developments in ground point determination from HRSI via the model of terrain independent rational polynomial coefficients (RPCs). A brief mathematical background to rational functions is first presented, along with a review of the models for generating RPCs from a rigorous sensor orientation, and for geopositioning via either forward intersection or monoplotting. The concept of RPC block adjustment with compensation for exterior orientation biases is then discussed, as is the means to enhance the original RPCs through a bias correction procedure. The potential for RPC block adjustment to yield sub-pixel geopositioning accuracy from HRSI is illustrated using results from experimental testing with two Quickbird stereo image pairs and three multi-image IKONOS blocks. Finally, error propagation issues in RPC block adjustment of HRSI are considered. Copyright ISPRS Numéro de notice : A2006-229 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2005.11.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2005.11.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27956 [article]

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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)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 3 (May 2006) . - pp 195 - 211 Titre : Multi-image matching for DSM generation from Ikonos imagery Type de document : Article/Communication Auteurs : Li Zhang, Auteur ; Armin W. Gruen, Auteur Année de publication : 2006 Article en page(s) : pp 195 - 211 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] appariement d'images [Termes IGN] capteur en peigne [Termes IGN] chambre DTC [Termes IGN] classification ascendante hiérarchique [Termes IGN] contrôle qualité automatique [Termes IGN] données laser [Termes IGN] erreur moyenne quadratique [Termes IGN] image à résolution métrique [Termes IGN] image Ikonos [Termes IGN] image SPOT-HRS [Termes IGN] modèle numérique de surface [Termes IGN] photogrammétrie numérique [Termes IGN] photogrammétrie spatiale [Termes IGN] point d'appui [Termes IGN] précision métrique [Termes IGN] Suisse Résumé : (Auteur) High-resolution satellite images at sub-5-m footprint, such as IKONOS and SPOT5 HRG/HRS images, are becoming increasingly available to the earth observation community and their respective clients. The related cameras all use linear array CCD technology for image sensing. The processing of these kinds of images provides a challenge for algorithmic redesign and this offers the possibility of reconsidering and improving many photogrammetric processing components. This contribution presents an advanced matching approach for automatic DSM generation from high-resolution satellite images. It can provide dense, precise and reliable results. The method matches multiple (more than two) images simultaneously and it uses a coarse-to-fine hierarchical solution with an effective combination of several image matching algorithms and automatic quality control. The DSMs are generated by a combination of matching results of feature points, grid points and edges. The proposed approach has been applied to IKONOS images over a testfield in Thun, Switzerland with accurate ground control points, a 1600-m height range and variable land cover, but with sub-optimal imaging conditions (snow, long shadows). The accuracy tests are based on the comparison between the reference data from an airborne laser scanner and the automatically extracted DSMs. The RMS errors for the whole area, excluding trees and bushes, are 2-3 m, while for bare ground the accuracy is about 1 m or even better. Copyright ISPRS Numéro de notice : A2006-230 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.01.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.01.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27957 [article]

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Updating topographic mapping in Great Britain using imagery from high-resolution satellite sensors / David A. Holland 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 212 - 223 Titre : Updating topographic mapping in Great Britain using imagery from high-resolution satellite sensors Type de document : Article/Communication Auteurs : David A. Holland, Auteur ; Doreen S. Boyd, Auteur ; P. Marshall, Auteur Année de publication : 2006 Article en page(s) : pp 212 - 223 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] caméra numérique [Termes IGN] détection de changement [Termes IGN] Grande-Bretagne [Termes IGN] image à haute résolution [Termes IGN] mise à jour cartographique [Termes IGN] organisme cartographique national Résumé : (Auteur) Topographic mapping from remotely sensed imagery is carried out all over the world, using data from an ever-growing number of sensors. Traditional film cameras are gradually being replaced by digital cameras and scanners, but most topographic mapping still relies on sensors based on airborne platforms. This paper examines the potential of high resolution satellite sensor imagery for the updating of topographic mapping, from the perspective of a national mapping agency. After a review of satellites capable of being used for this purpose, several examples of mapping projects are presented. The paper ends with a look to the future, and asks whether satellite imagery can ever replace airborne (digital or analogue) photography for the makers of maps. It is concluded that high resolution satellite sensor imagery does have a role to play in the update of topographic mapping, especially in the detection of change. Copyright ISPRS Numéro de notice : A2006-231 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.02.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.02.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27958 [article]

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