Abstract:This paper uses the Sentinel-1A SAR data from March 2017 to March 2018 to obtain the ground deformation of Chengdu's main urban area by using PSI and SBAS technologies. The distribution information, combined with ground level data, is used to evaluate the accuracy of the InSAR results. The reasons for the ground subsidence are analyzed. The results show that most areas of Chengdu are stable, and the deformation interval is mainly concentrated at -5~5 mm/a; the ground subsidence is mainly located outside the first ring line, and the uneven settlement of the main stations and surrounding areas of metro lines 5 and 6 is obvious. The sedimentation rate reached 20 mm/a, and the land subsidence in different urban areas such as Chenghua district and Jinjiang district differs. The annual average rate is in the range of 5~15 mm/a, and the correlation between PSI and SBAS is higher.
PAN Chao,JIANG Liming,SUN Qishi et al. Monitoring and Analyzing Chengdu Ground Subsidence Based on InSAR Technology by Using Sentinel-1 Radar Image[J]. jgg, 2020, 40(2): 198-203.