Design and Implementation of Comparative Experiments Between D-InSAR and PS-InSAR for Analyzing Slow Topographic Changes in Estuarine Deltas

Based on the monthly data obtained by the Sentinel-1A satellite from 2018 to 2021, the comparative experimental analysis of slow changes in topography and geomorphology was implemented using D-InSAR and PS-InSAR techniques, with the study area located at the Salween River estuary. The results indicate a significant consistency in the change processes and spatial-temporal features extracted by both techniques, and the PS-InSAR technique performed higher accuracy. The average terrain change rate in the study area over four years was 5 mm/year. The northern coast, where the north-south and east-west tributaries converge at the estuary, initially exhibited an accumulation followed by erosion, while the southwestern islands of the estuary showed a clear accumulation characteristic. The experiment not only helps students to understand the principles and methods of analyzing slow changes in estuarine delta geomorphology, but also assists in mastering InSAR data processing techniques. Moreover, it helps cultivate students’ practical skills and research qualities, providing a reference for experimental design in remote sensing courses.