Retrieval of Ground Deformation Based on TS-DInSAR Technique

Time series interferogram analysis is an upgrade of the traditional 2/3/4-pass differential interferometry, and has been widely used to map ground deformation associated with urban subsidence, landslide, earthquake and so on. This paper analyzes some key steps in TS-DInSAR processing, including selection of high-coherent points, extraction of linear deformation, separation nonlinear deformation phase and atmospheric phase. Finally, an experiment based on TS-DInSAR technique is conducted over Taiyuan area using totally 14 ENVISAT ASAR scenes in the time span of 2003-2007, and the result of derived deformation shows good agreement with the leveling data with mean square root error of 3.1mm, demonstrating that the TS-DInSAR technique is accurate and efficient in deformation mapping over urban areas.