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DGPF projec t: evaluation of digital photogrammetric aerial-based imaging systems: overview and results from the pilot center / Michael Cramer in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 9 (September 2010)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 9 (September 2010) . - pp 1019 - 1029 Titre : DGPF projec t: evaluation of digital photogrammetric aerial-based imaging systems: overview and results from the pilot center Type de document : Article/Communication Auteurs : Michael Cramer, Auteur ; Norbert Haala, Auteur Année de publication : 2010 Article en page(s) : pp 1019 - 1029 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra numérique [Termes IGN] photogrammétrie aérienne [Termes IGN] précision géométrique (imagerie) [Termes IGN] test de performance Résumé : (Auteur) Within this paper, results of a test on the evaluation of the most recent photogrammetric digital airborne camera systems are presented. This project was initiated by the German Society of Photogrammetry, Remote Sensing and Geoinformation (DGPF), based on data from 12 different digital sensor systems flown in a well-controlled test site. The main topics of the evaluation phase are the analysis of geometric accuracy and sensor calibration, the radiometric performance including on-site radiometric calibration and multi-spectral land classifications, the performance of photogrammetric Digital Surface Model (dsm) generation, and the potential of manual stereoplotting from digital images. Within this paper, only results obtained at the Institute of Photogrammetry (iff), Universitaet Stuttgart will be presented, comprehensively proving the high performance of digital camera systems and processing. The IFF served as the pilot center and additionally concentrated on the investigation of camera geometry and the image based generation of height data. Numéro de notice : A2010-365 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.9.1019 En ligne : https://doi.org/10.14358/PERS.76.9.1019 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30559 [article]

Comparison of matching algorithms for DSM generation in urban areas from ikonos imagery / A. Alobeid in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 9 (September 2010)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 9 (September 2010) . - pp 1041 - 1050 Titre : Comparison of matching algorithms for DSM generation in urban areas from ikonos imagery Type de document : Article/Communication Auteurs : A. Alobeid, Auteur ; Karsten Jacobsen, Auteur ; Christian Heipke, Auteur Année de publication : 2010 Article en page(s) : pp 1041 - 1050 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse comparative [Termes IGN] appariement automatique [Termes IGN] appariement semi-global [Termes IGN] détection du bâti [Termes IGN] image à résolution métrique [Termes IGN] image Ikonos [Termes IGN] image optique [Termes IGN] méthode des moindres carrés [Termes IGN] milieu urbain [Termes IGN] modèle numérique de surface [Termes IGN] programmation dynamique Résumé : (Auteur) The extraction of the third dimension from remote sensing data is a well known technique. Since in a number of countries aerial images and laser scanner data are unavailable, expensive or classified, stereoscopic high-resolution optical satellite images provide a viable alternative for generating digital surface and digital terrain models. Especially the automatic extraction of highly accurate 3D surface models in urban areas is still a very complicated task due to occlusions, large differences in height and the variety of objects and surface material. In this paper, an analysis and a visual and quantitative comparison of three different matching algorithms for generating urban DSMs based on very high-resolution satellite images is presented. The three algorithms are least squares matching (lsm) in a region growing fashion, dynamic programming (DP) and semiglobal matching (sgm). The characteristics of the three algorithms as applied to four different Ikonos stereo pairs with a ground sampling distance of 1 m are shown. The following results were obtained: visually, in the lsm results the shape of the buildings is considerably smoothed. While in the DP results the building shape is sharper, only little detail is visible on the building roofs, and streaking along the epipolar lines causes problems. With SGM, more details can be extracted and the results visually have the best quality. Based on reference data for the different test sites, the standard deviation of the building heights determined by LSM and DP is in the range of one pixel or slightly better, while it is in the range of half a pixel for SGM. Numéro de notice : A2010-366 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.9.1041 En ligne : https://doi.org/10.14358/PERS.76.9.1041 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30560 [article]

Persistent scatterer interferometry : potential, limits and initial C- and X-band comparison / M. Crosetto in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 9 (September 2010)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 9 (September 2010) . - pp 1061 - 1069 Titre : Persistent scatterer interferometry : potential, limits and initial C- and X-band comparison Type de document : Article/Communication Auteurs : M. Crosetto, Auteur ; O. Montserrat, Auteur ; R. Iglesias, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 1061 - 1069 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] analyse comparative [Termes IGN] bande C [Termes IGN] bande X [Termes IGN] Barcelone [Termes IGN] coin réflecteur [Termes IGN] déformation d'image [Termes IGN] échantillonnage d'image [Termes IGN] erreur de positionnement [Termes IGN] image C-SAR [Termes IGN] image Envisat-ASAR [Termes IGN] image ERS-SAR [Termes IGN] image radar moirée [Termes IGN] image TerraSAR-X [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] résidu Résumé : (Auteur) This paper is focused on the potential and limits of Persistent Scatterer Interferometry (PSi), a powerful remote sensing technique used to measure deformation phenomena. It only refers to satellite-based PSI techniques, focusing on the most important sources of C-band SAR data: ers and Envisat. In addition, it compares C- and X-band results, considering data from the high-resolution TerraSAR-X sensor. The paper begins with a description of the main characteristics of PSI. It then discusses the most important PSI products and their performances, analyzing their spatial sampling, the so-called residual topographic error and PSI geocoding, the average displacement rates, and the deformation time series. As C-band products are concerned, the paper reports some relevant PSI validation results, which come from the ESA-funded Terrafirma Validation Project. Regarding the X-band, it describes the results obtained over the City of Barcelona by processing 13 TerraSAR-X images. The last part discusses the main limits of PSI. Numéro de notice : A2010-367 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.9.1061 En ligne : https://doi.org/10.14358/PERS.76.9.1061 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30561 [article]