基于PS-InSAR技术的城市地表沉降监测

Urban Land Surface Settlement Monitoring Based on PS-InSAR Technology

对永久散射体(PS-InSAR)的两种识别方法(相干系数阈值法和振幅离差指数阈值法)进行了理论分析和实验对比;在传统方法的基础上,结合两种方法提取了较可靠的PS点。基于PS-InSAR技术,以山东省胜利油田为研究区域,提取了可靠的PS点;利用28景ALOS影像获取了研究区的地表沉降速率,并提取了沉降时间序列。实验结果表明,2007-2011年研究区域产生了一定程度的沉降,平均沉降速率超过了14 mm/a。

With theoretical analysis and experimental comparison,we evaluated two methods for PS identification,such as correlation coefficient threshold method and amplitude dispersion index threshold method in this paper.Based on the traditional method,we combined with two methods to extract some reliable PS points.Taking the Shengli oil field in Shandong Province as the research area,we used PS-InSAR technology to extract the reliable PS points,and used 28 scene ALOS images to obtain the land surface settlement rate,and extract the settlement time series in the study area.The experimental results showed that from 2007 to 2011,a certain degree of settlement occurred in the study area,and the average settlement rate of this area exceeded 14 mm/a.