A Study of the High Resolution COSMO-SkyMed SAR Data for Ground Subsidence

COSMO SkyMed satellites are very suitable for natural disaster monitoring, because they can acquire high quality images with very high resolution. 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. In this paper, COSMO-SkyMed SAR and ASAR data are respectively processed by DInSAR for land subsidence derivation in Tianjin. The comparison between the two preliminary results shows that similar deformation trend can be identified based on the two kinds of SAR. data and the deformation values of COSMO's DInSAR result are closer to truth. With the characteristics of high resolution and short wavelength, COSMO data seem more robust for extract high-precision ground deformation information than ASAR data in case of no obvious orbit error existing in both the 2 kinds of data. While COSMO data are suitable for high-precision information extraction in a relatively small and important area, ASAR data are fit for large area, regional surface deformation survey.