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Influence of DEM on ground subsidence monitoring of PS-InSAR

LI Yingchen;KE Yinghai;GONG Huili;LI Xiaojuan;CHEN Beibei;Key Laboratory of 3D Information Acquisition and Application,Ministry of Education,Capital Normal University;The State Key Laboratory Breeding Base of Process of Urban Environment and Digital Simulation,Capital Normal University;Map Supervision Center,NASG;  
According to the fact that ground subsidence monitoring by the PS-InSAR system is sensitive to DEM precision,this paper uses SRTM-3 DEM、ASTER GDEM and Pleiades stereo image pairs to obtain DEM.This research analyzes the elevation accuracy of three DEM and the settlement monitoring precision involved in the PS-InSAR process.The results show that the monitoring accuracy of Pleiades DEM is higher in built-up area and viaduct area,and srtm-3 DEM is more accurate in residential and construction area settlement monitoring.The results provide a reference for the DEM selection of PS-InSAR settlement monitoring in different regions.
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