DInSAR for land subsidence monitoring using high resolution COSMO-SKYMED SAR Data: Preliminary results compared with ASAR

DInSAR can map ground deformation phenomena over tens-of-kilometers-wide area with centimeter-scale accuracy level, and has been considered as a powerful tool. Because of the data availability, previous DInSAR applications were mainly base on ERS, JERS, ENVISAT ASAR, and RADARSAT-1 data with resolution coarser than 10m. Nowadays, several kinds of high resolution SAR data are available for DInSAR and there are high expectations for the application of these data. In this paper, COSMO-SkyMed SAR data and grid digital elevation model ASTER GDEM (30m resolution) are used as research data. COSMO-SkyMed SAR data are preliminary processed by DInSAR technique for land subsidence mapping of Tianjin and Beijing area. Meanwhile, the DInSAR results from COSMO-SkyMed and ASAR data are preliminary compared. COSMO images are more suitable to extract high-precision ground deformation information than ASAR images in civil application given precise orbit data. While COSMO data are suitable for deformation monitoring in a relatively small and important area, ASAR data are fit for regional survey.