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Deformation monitoring of single buildings using meter-resolution SAR data in PSI / Stefan Gernhardt in ISPRS Journal of photogrammetry and remote sensing, vol 73 (September 2012)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 73 (September 2012) . - pp 68 - 79 Titre : Deformation monitoring of single buildings using meter-resolution SAR data in PSI Type de document : Article/Communication Auteurs : Stefan Gernhardt, Auteur ; R. Bamler, Auteur Année de publication : 2012 Article en page(s) : pp 68 - 79 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] analyse diachronique [Termes IGN] déformation d'édifice [Termes IGN] semis de points Résumé : (Auteur) In this paper the feasibility to monitor the shape and deformation of single buildings from space is investigated. The methodology is based on a fusion of persistent scatterer (PS) point clouds obtained from several stacks of meter-resolution synthetic aperture radar (SAR) data. This kind of high resolution imagery as well as accurate orbit information is available from, e.g., TerraSAR-X. The stacks are processed individually applying persistent scatterer interferometry (PSI), which provides deformation and height estimates for the PS. However, the geocoded PS point clouds cannot be simply merged in one common coordinate system, like UTM, by reason of residual offsets with respect to their final true positions. These deviations originate from the height uncertainty of the reference point, which has to be chosen during PSI processing of each stack. The presented methodology allows for a fusion of several PS point clouds, i.e., the correct reference point heights can be recovered. The algorithm is based on a point cloud matching procedure that consists of a determination of appropriate point correspondences and a minimization of the distances between all selected pairs of points in a least-squares sense. In addition, the reconstruction of the original motion vector from the deformation measurements in line of sight provided by PSI is desirable. The availability of separated motion components in vertical and horizontal directions greatly enhances the insights into deformation events at buildings and ground. To this end, the fused point clouds are used for a decomposition of motion components. By reason of the limited sensitivity of ascending and descending stacks of TerraSAR-X to deformation in north-southern directions the reconstruction of motion vector components is restricted to components in west-eastern and vertical directions. The latter are estimated in a least-squares adjustment including all PS within a spatially limited area. Deformation estimates of stacks from ascending and descending tracks must be included in order to separate motion components. The latter cannot be determined precisely from a combination of solely equal heading tracks, as the line of sight does not differ enough. Finally, deformation maps of the urban area are available that separately show seasonal and linear deformation in horizontal as well as vertical directions. These maps comprise important information on subsidence or uplift as well as structural stress at buildings due to thermal dilation. As a result of the presented methodology (and for the first time) sufficient and precise motion estimates are available for a detailed monitoring of single objects using meter-resolution SAR data in PSI. Several examples are discussed using the results of motion component estimation based on the fusion of four data stacks evaluated by PSI. Numéro de notice : A2012-545 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.06.009 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.06.009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31991 [article]

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081-2012071	SL	Revue	Centre de documentation	Revues en salle	Disponible

The Shuttle Radar Topography Mission: a new class of digital elevation models acquired by spaceborne radar / B. Rabus in ISPRS Journal of photogrammetry and remote sensing, vol 57 n° 4 (February - March 2003)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 57 n° 4 (February - March 2003) . - pp 241 - 262 Titre : The Shuttle Radar Topography Mission: a new class of digital elevation models acquired by spaceborne radar Type de document : Article/Communication Auteurs : B. Rabus, Auteur ; M. Eineder, Auteur ; Achim Roth, Auteur ; R. Bamler, Auteur Année de publication : 2003 Article en page(s) : pp 241 - 262 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] bande C [Termes IGN] bande X [Termes IGN] image radar moirée [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] mission spatiale [Termes IGN] modèle numérique de terrain [Termes IGN] navette spatiale [Termes IGN] qualité des données [Termes IGN] SRTM Résumé : (Auteur) For 11 days in february 2000, the Shuttle Radar Topography Mission (SRTM) successfully recorded by interferometric synthetic aperture radar (InSAR) data of the entire land mass of the earth between 60° N and 57° S. The data acquired in C-and X-bands are processed into the first global elevation models (DEMs) at 1 arc sec resolution, by NASA-JPL and German aerospace center (DLR), respectively. From the perspective of the STRM-X system, we give in this paper an overview of the mission and the DEM production, as well as an evaluation of the DEM product quality. Special emphasis is on challenges and peculiarities of the processing that arose from the unique designn of the STRM system, which has been the first single-pass interferometer in space. Copyright ISPRS Numéro de notice : A2003-023 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(02)00124-7 En ligne : https://doi.org/10.1016/S0924-2716(02)00124-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22320 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-03011	SL	Revue	Centre de documentation	Revues en salle	Disponible