Science Service System

Summary of Proposal MTH0015

TitleAssessment of TerraSAR-X Products with Respect to Mapping Applications Using Radargrammetric and Interferometric Techniques
Investigator Raggam, Hannes - Joanneum Research Forschungsgesellschaft mbH, Institute for Information and Communication Technologies
Team Members
Dr. Gutjahr, Karlheinz - Joanneum Research Forschungsgesellschaft mbH, Institute of Digital Image Processing
Dr. Dekker, Rob - TNO Defence, Security and Safety, Geospatial Image Analysis and GIS
Dr.techn.habil. Sharov, Aleksey - Joanneum Research Forschungsgesellschaft mbH, Institute of Digital Image Processing
Dr. Kenyi, Lado Wani - University of Maryland, Department of Geography
SummaryThe general objective of the proposed research refers to a variety of mapping and monitoring applications which can be based on the utilization of SAR image data. The innovative features of the TerraSAR-X system seriously increase the mapping potential in comparison to present and past SAR sensors. Particular benefit in this concern arises from the high resolution which is feasible for TerraSAR images and which provides high detail of the terrain surface. In order to investigate the potential of TerraSAR-X for selected mapping and monitoring applications the following key aspects will be treated: • Stereo-processing of TerraSAR stereo pairs in order to generate elevation models over alpine, urban and rural terrain. For the alpine area, the best suited combination of incidence angles shall be determined. Therefore, a-priori simulation and determination of layover/shadow areas may be helpful in order to specify the optimum incidence angles to be considered. For the urban and rural terrain it shall be investigated, whether and to which degree of detail and accuracy objects like buildings and trees can be reconstructed. • Merging of elevation models, but also of ortho images which are generated from TerraSAR image pairs acquired from ascending and descending orbits, respectively. For alpine terrain as well as for the urban and the rural test site this may help to reduce the problems induced by SAR layover and/or shadow areas through proper alternating replacement, and to get an optimized shape of the terrain surface (terrain morphology, buildings, trees). • Interferometric processing of multi-temporal INSAR data sets over urban test sites in order to detect changes due to building and suchlike activities. In parallel, the feasibility to detect changes by means of the amplitude products shall be investigated and comparatively assessed to the INSAR approach. Moreover, multi-temporal stereo coverages shall be processed in order to investigate the feasibility to detect changes via 3D stereo mapping. • Processing of multi-temporal differential interferometric data sets over a mining area in order to map subsidence. Therefore, the method based on differential INSAR processing techniques on the one hand and the persistent scatterers approach on the other hand will be applied. The latter is expected to be superior in case where the coherency is reduced due to temporal decorrelation. It makes use of stable features like roofs of buildings, as they are available in the “Wolfsberg” test area, which has been selected for this purpose. • The combination of satellite radar interferometry and altimetry data offers a particularly potent solution to the topographic modelling of large glacier complexes in the case of insufficient ground control as usual. This combination shall be applied to Austrian glacier areas as well as the Austfonna Ice Dome in Svalbard in order to update the information content and enhancing the accuracy, integrity, durability, and versatility of glacier interferometric and radargrammetric models. Methodological and algorithmic developments towards the complementary use of satellite radar interferometry and altimetry for generating and upgrading morphological and rheological models shall be made. The work can be based on yet existing experience regarding the treatment of TerraSAR-X products, which should have been acquired during the involvement of the Institute of Digital Image Processing into the development of value-adding processors for the commercial TerraSAR-X service segment, which is done under contract of Infoterra (Germany). For all of the test sites detailed reference information and other remote sensing data (including high resolution optical images) are available. As far as possible, these will be used for adequate mapping experiments as well in order to serve for validation and accuracy analysis of the results achieved from TerraSAR-X.

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