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《Chinese Journal of Geophysics》 2007-02
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Subsidence velocity retrieval from long-term coherent targets in radar interferometric stacks

WANG Yan~1, LIAO Ming-Sheng~1, LI De-Ren~1,WEI Zi-Xin~2, FANG Zheng~21 State Key Laboratory for Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China2 Shanghai Institute of Geological Survey, Shanghai 200072, China  
Distribution of land subsidence could be obtained with long-term coherent targets analysis. Based on the conventional differential InSAR, coherent targets analysis is a new method to identify stable natural reflector, highly coherent pointy target, with multi-temporal SAR images. The test site in our experiment covers about 100 km+2 in the main downtown of Shanghai city. 25 scenes of single look complex images of ERS-1/2 from 1992 to 2000 are chosen as the import data set. The result of CT points over 8 years with average temporal sampling of 4 months has been presented in this paper. Without any apriori deformation model, the accuracy of the land subsidence velocity from CTA is less than 5 mm, which satisfies the requirement in monitoring urban subsidence in China. This investigation shows the potential of CTA approach in monitoring land deformation on a large temporal/spatial scale.
【Fund】: 国家自然科学基金项目(60472039);; 国家863计划项目(2006AA12Z123);; 中国科技部-欧洲空间局“龙”计划合作项目(ID2567)资助
【CateGory Index】: P642.26
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