Circulation characteristics of interannual and interdecadal anomalies of summer rainfall in north Xinjiang
王艳，廖明生，李德仁等.利用长时间序列相干目标获取地面沉降场.地球物理学报，2007

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.