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Persistent scatterers at building facades – Evaluation of appearance and localization accuracy / Stefan Gernhardt in ISPRS Journal of photogrammetry and remote sensing, vol 100 (February 2015)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 100 (February 2015) . - pp 92 - 105 Titre : Persistent scatterers at building facades – Evaluation of appearance and localization accuracy Type de document : Article/Communication Auteurs : Stefan Gernhardt, Auteur ; Stefan Auer, Auteur ; Konrad Eder, Auteur Année de publication : 2015 Article en page(s) : pp 92 - 105 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] coin réflecteur [Termes IGN] estimation de position [Termes IGN] façade [Termes IGN] image optique [Termes IGN] image radar moirée [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] modélisation 3D [Termes IGN] Munich [Termes IGN] photogrammétrie architecturale [Termes IGN] photogrammétrie terrestre Résumé : (auteur) Thanks to the high resolution of modern SAR satellites many persistent scatterers (PS) appear at single buildings. Approximately half of them represent building facades. These groups of points often show regular patterns in SAR images that can be related to repeating structure elements on the facades. Hence, individual buildings can now be monitored over time, either based on amplitude (for change detection) or phase information (using interferometric methods). However, patterns of point signatures are often disrupted or disappear when the imaging geometry is slightly changed. In addition, the localization accuracy of estimated and geocoded natural PS is not known, yet. The investigation at hand provides a detailed analysis of PS patterns based on reference data obtained from a photogrammetric survey and terrestrial measurements. The processing of the optical images allows creating a detailed 3D model of the respective facade, which represents the geometrical object information for SAR simulation. The terrestrial measurements allow relating the 3D model to its true position in a world coordinate system like UTM (Universal Transverse Mercator), which is necessary for assessing the localization accuracy of the signatures. From the simulation results the appearance of the point patterns of natural PS in high resolution SAR data can be better understood. Moreover, the localization accuracy and the precision for these points can be derived for the first time. The approach and findings for two case studies in Munich are described in detail in this paper. Numéro de notice : A2015-056 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2014.05.014 En ligne : https://doi.org/10.1016/j.isprsjprs.2014.05.014 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75300 [article]

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3D SAR simulation of urban areas based on detailed building models / Stefan Auer in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 12 (December 2010)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 12 (December 2010) . - pp 1373 - 1384 Titre : 3D SAR simulation of urban areas based on detailed building models Type de document : Article/Communication Auteurs : Stefan Auer, Auteur ; Timo Balz, Auteur ; S. Becker, Auteur ; R. Balmer, Auteur Année de publication : 2010 Article en page(s) : pp 1373 - 1384 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] bâtiment [Termes IGN] centre de phase [Termes IGN] coin réflecteur [Termes IGN] image TerraSAR-X [Termes IGN] interferométrie différentielle [Termes IGN] lancer de rayons [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] simulation d'image Résumé : (Auteur) This paper confirms the need for detailed 3D models for the simulation of high-resolution SAR images in order to support Persistent Scatterer Interferometry (PSl) focused on single urban objects. Using a building model enhanced by facade grammar, multiple reflections at building facades are analyzed using ray tracing techniques and scatterers are localized in azimuth, range, and elevation. In a case study, salient signatures of a TerraSAR-X image are analyzed based on simulated sar reflectivity maps. Phase centers of trihedral reflections are mapped onto the building model and the physical correspondence of scatterers to building features is investigated. Surfaces contributing to salient scatterers are identified at the building model. Eventually, the use of sar simulation to support PSI is shown from two aspects: (a) for providing a-priori information about building layover, and (b) for extending knowledge about the nature of dominant scatterers. Numéro de notice : A2010-526 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.12.1373 En ligne : https://doi.org/10.14358/PERS.76.12.1373 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30718 [article]