Correction of atmospheric effect in ASAR interferogram using MODIS data

The atmospheric phase delay caused by tropospheric water vapor is an important factor to the precision of repeat pass InSAR. In order to solve the problems in InSAR atmospheric phase delay effectively, the atmospheric delay error of InSAR was analyzed, and the atmospheric correction methods and key technology using MODIS water vapor data for ASAR interferograms were presented. Then, the atmospheric corrections was conducted using ASAR interferometric pair over the Taiyuan region as examples. The experimental results show that the quality of interferogram can be improved greatly by the MODIS/ASAR atmospheric correction method, and the deformation inversion accuracy can be significantly improved, the necessity and reliability of MODIS and ASAR data fusion form obtaining information of surface deformation are aslo verified.