Applicability Assessment of Multi-Source DEM-Assisted Separately InSAR Deformation Monitoring Considering Two Topographical Features

The high-precision digital elevation model (DEM) is of great significance for improving the accuracy InSAR deformation monitoring. In today’s free opening multi-source DEM, there no consensus on how to select suitable DEMs assist in monitoring different landforms. This article introduces five types DEMs: ALOS12.5, SRTM-1, ASTER V3, AW3D30, and Copernicus 30, uses SBAS-InSAR technology analyze applicability Qinghai Tibet Plateau Central China Plain regions. coverage, average value, standard deviation, unwrapping efficiency phase results, temporal rate curves six random points key area, as well consistency with second-level data comparative analysis RMSE all points, show that region, 30 best, followed by SRTM-1 having low accuracy, ALOS12.5 worst. AW3D30 V3 still Although has highest resolution, it not recommended based its worst performance plateau plain areas. It use areas