DEM对PS-InSAR地面沉降监测的影响

Influence of DEM on ground subsidence monitoring of PS-InSAR

针对PS-InSAR监测地面沉降受DEM精度影响的问题,该文通过应用SRTM-3DEM、ASTER GDEM和Pleiades立体像对来获取DEM,分析对比3种DEM的高程精度及其参与PS-InSAR流程的沉降监测精度。结果表明,Pleiades DEM在建筑密集区和高架桥区的监测精度更高,SRTM-3DEM在居民地和施工地区沉降监测精度更高。该成果为不同区域PS-InSAR沉降监测的DEM选择提供了参考。

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 PSqnSAR settlement monitoring in different regions.