SEGJ Technical Conference

Relation between the long-range ground deformation measurement results from InSAR, GPS, and leveling.

Abstract The data used in this study were ENVISAT/ASAR images acquired from 2003 to 2008 in the Kanto area. The results of InSAR analysis were compared with GPS and leveling data. The error factors of InSAR measurement are summarized as follows, an error at the time of registration, estimation error of the distance between orbits, the phase limit of the critical distance between orbits, the atmospheric phase delay, low coherence, a sensor noise, and the error of DEM. However, in actual analysis, the following problems occur, there are quite a few InSAR pairs with high coherence even the good interference conditions, the estimation of the distance between orbits and the phase unwrapping processing are unstable, InSAR pairs acquired in the same season are used to avoid the problem of atmospheric phase delay. We analyzed the relations between the land subsidence maps from SAR images, GPS data, and leveling data. As the results, InSAR deformations in most of the points show the similar results of GPS and leveling.