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|Title||Landslide deformation monitoring in Three Gorges area with archived Spotlight-mode TerraSAR-X data stack|
|Investigator||Zhang, Lu - Wuhan University, State Key Laboratory of Information Engineering in Surveying, Mapping and Remote|
The Shuping landslide at Zigui County upriver the Three Gorges Dam that is located in the middle Yangtze River is taken as our test site. From our previous study with stripmap-mode TerraSAR-X data, it has been revealed that the rapid fluctuations of water level in the Three Gorges Reservoir has agreat impact on the slope stability of the Shuping landslide.
A long-term stack of spotlight-mode TerraSAR-X data covering the test site has been acquired in descending orbit and archived by DLR from 2008 to 2011. Therefore, in this proposed project we would like to investigate the potential unique capability of using spotlight-mode SAR data in landslide motion monitoring and compare it with that of using stripmap-mode SAR data. Detailed researches will becarried out in the following aspects.
(1) A high-resolution DEM covering the test site will be generated from a limited number of spotlight-mode TerraSAR-X InSAR data pairs with suitable temporal and spatial baselines. Then a comparison between the resultant DEM anda DEM derived from a TerraSAR-X/TanDEM-X bistatic data pair that was providedby DLR (NTI_INSA0357) will be undertaken.
(2) Both PSI and offset tracking analyses will be carried out using the spotlight-mode TerraSAR-X data stack to derive the LOS deformation velocity map over the landslide slope surface. Then comparisons will be performed to evaluate both techniques in terms of capability of measuring subtle deformation at landslide slope surface.
(3) PSI results derived from the spotlight-mode data stack will be cross-validated with that was obtained from the stripmap-mode data stack. Both results of LOS displacements must be converted into motion vectors along the gradient of thelandslide slope surface before comparison. Then the stability of landslide slopes will be evaluated and the relationship between the landslide deformation activities and waterlevel variations will be analyzed.
(4) PSI and offset tracking results derived from the X-band TerraSAR-X data stacks will be compared with those obtained with C-band ENVISAT ASAR and L-band ALOS PALSARdata stacks. Then the merits and shortcomings of different microwave bands in application of landslide monitoring will be evaluated.
The project is funded by the National Key Basic Research Program of China (Grant No. 2013CB733205) and the National Natural Science Foundation of China (Grant No. 41174120, 41271457 and 41021061).
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