利用高分辨率TerraSAR-X影像监测唐山矿地面沉降

Land Subsidence Monitoring of Tangshan Mine Using High Resolution TerraSAR-X Images

利用2012-12~2014-02获取的13景高分辨率TerraSAR-X影像,采用PSI时序分析技术监测唐山矿地面沉降。该技术以短时空基线为准则生成47幅差分干涉图,选择强度稳定性和频谱相干性较高的相干目标进行时间序列分析,基于最小二乘法获取唐山矿区域相干目标的地面下沉速率和沉降时间序列。结果表明,唐山矿有两个地面沉降中心,分别位于矿区东北和西部方向,最大沉降速率达58.2mm/a;2013-06~09矿区出现回弹现象,而在其他时间段内地面呈近似线性下沉。通过对比高程误差改正前后的直方图可以发现,本文采用的两次回归分析方法对降低地形残余误差有很好的应用效果。

In this paper, the subsidence of Tangshan mine during the period from December 2012 to February 2014 is monitored with PSI technique using thirteen high resolution TerraSAR-X acquisitions. The overall deformation analysis is carried out on coherent targets with strong intensity stability and high spectral coherence, which are extracted from 47 interferograms with short temporal and spatial baselines, to obtain the subsidence velocity and time-series. The monitoring results show that there are two subsidence centers separately in the northeast and west directions, with a maximum subsidence velocity 58. 2 mm/a. It is also found that ground rebound took place from June 2013 to September 2013, yet ground subsidence is approximately linear in the other observation period. Finally, by comparing two elevation error histograms before and after correction, we conclude that the two times regression method used in this paper is perfectly effective for the reduction of topographic residual errors.