基于PS-InSAR和SBAS技术监测昆明市主城区地面沉降

Monitoring Land Settlement in the Main Urban Area of Kunming Based on PS-InSAR and SBAS Technology

由于昆明近几年城市建设发展、地铁兴建、地下水开采等,导致地面出现严重的沉降现象,因此对其进行有效监测十分必要。本文利用覆盖昆明地区的30幅Sentinel-1A影像,分别采用PS-InSAR技术和SBAS-InSAR技术进行数据处理,获得两组昆明市主城区的地表沉降信息,并通过交叉验证分析和时序分析对两组结果进行对比。结果表明:两种方法的结果具有相关性、可靠性和较高一致性,研究区在2018年7月至2019年7月期间存在地面沉降问题,且最大年沉降速率可达到-39.258 3 mm/a。

Since Kunming's urban construction and development,subway construction,and groundwater extraction in recent years have caused serious ground subsidence,it is necessary to monitor the settlement of the ground effectively.In this paper,30 Sentinel-1A images covering Kunming area are used for data processing by using PS-InSAR technology and SBAS-InSAR technology respectively,and two groups of ground settlement information in the main urban area of Kunming are obtained,and the two groups of results are compared by cross validation analysis and time sequence analysis.The results show that the results of the two methods are correlated,reliable and highly consistent.The land settlement problem exists in the study area from July 2018 to July 2019,and the maximum annual settlement rate can reach-39.2583 mm/a.