基于Sentinel-1A数据的PSI技术在城市地表形变监测方面的应用

随着佛山市城市化进程逐步加快,地表形变引发的地质灾害日益显著,应用时序InSAR技术可以精确监测城市地表形变。文中选取广东佛山地区为研究区域,利用2015-2017年获取的41景Sentinel-1A数据,基于永久散射体差分干涉测量(PSI)技术提取该地区的时序形变、平均沉降速率等形变数据。研究结果表明,佛山市部分区域出现不均匀沉降,部分地区沉降速率甚至超过-35 mm/a,主要集中在城市重点建设区域,如地铁施工、桥梁施工等地。综合研究结果表明,利用Sentinel-1A数据的时序PSI技术可以高精度监测城市地表形变,监测数据有利于及早预防城市地质灾害发生,为城市健康精细化管理提供决策依据。

Monitoring urban surface deformation based on Sentinel-1A data using time series PSI technique

With the gradual acceleration of urbanization in Foshan, the harm of surface subsidence has become increasingly significant. The use of time series InSAR technology can accurately monitor urban surface deformation. In this paper, based on persistent scatterer interferometric synthetic aperture radar(PSI) technique, the time series deformation and mean velocity are extracted by using 41 scenes Sentinel-1 A images during 2015 to 2017. The results indicate that uneven settlement occurs in some departmental area of Foshan city, and the settlement rate in some areas even exceeds-35 mm/year, mainly concentrated in key urban construction areas such as subway construction and bridge construction. The comprehensive research results also show that the time series PSI technique based on Sentinel-1 A data can accurately detect urban surface deformation and early prevent urban geological disasters, which provides a decision-making basis for urban health and refined management.