Experimental study of atmospheric correction to interferogram with high-resolution radar images and DEM over shuping landslide

The most important limiting factor of conventional D-InSAR method is strongly atmospheric wet delay during monitoring small landslides located at rainy and mountainous area. The wet delay phase could even cover deformation field of test site sometimes. In this paper, we found the wet delay phase over Shuping landslide was not only closely related with elevation, but also was a function of distance along radar azimuth or range direction. Therefore, based on least-square method, best-fit-polynomial correction models about wet delay filed over Shuping landslide could be established. By removing the wet delay phase field simulated from unwrapping phase, the deformation field of Shuping landslide could appear immediately. The result showed that this correction method could effectively remove the wet delay phase from differential interferograms, and it will have an important significance for monitoring slowly moving landslide in Three Gorges Area.