No abstract

This paper adopts time series analysis of the SAR images acquired in 10 phases up to 4-year span over Yancheng city in Jiangsu province. By selecting the SAR image acquired on September 3, 2005 as the master image and the rest of the SAR images as slave images, interferometric processing is carried out and 9 interferograms with terrain features and the deformation information are extracted. In dealing with the 9 differential interferograms utilizing PS technology, terrain features, spatial distribution with stable reflectivity characteristics are successfully determined. After temporal and spatial analysis of the 9 unwrapping interferograms, DEM error, atmospheric delay error in the master image and the slave image are obtained. Subsequently, the nonlinear-subsidence components at PS points are extracted. By integrating analysis of ground deformation direction, reference datum, floor deformation positiveness and negativeness, the surface subsidence distribution situation in time and space of Yancheng city area is revealed.