An improved pixel-tracking method for monitoring mining subsidence
An improved pixel-tracking method for monitoring mining subsidence
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DOI：
10.1080/2150704x.2016.1183177
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发表时间：
2016-05
影响因子：
2.3
通讯作者：
Jilei Huang;K. Deng;H. Fan;Shiyong Yan
中科院分区：
文献类型：
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作者：
Jilei Huang;K. Deng;H. Fan;Shiyong Yan
地下开采会引起地表产生较大的垂直位移，由于地表沉降梯度较大，干涉合成孔径雷达（干涉合成孔径雷达）相位解缠方法无法给出准确的解缠结果。基于归一化互相关最大化的像素跟踪克服了沉降梯度的限制，可用于监测大位移。本文介绍并分析了偏移场的各个组成部分，然后描述了利用数字高程模型（DEM）有效消除轨道误差和地形相关偏移的改进方法。利用11幅TerraSAR-X聚束模式图像和航天飞机雷达层析成像使命（SRTM）DEM数据，采用改进的像元跟踪法对榆林市神木县开采沉陷进行监测。改进方法与全球定位系统（GPS）数据之间的均方根误差（RMSE）在走向和倾向方向分别为0.143和0.108米。这里提出的方法被证明是适当的监测大的垂直位移在开采沉陷。
ABSTRACT Underground mining always induces large vertical displacements in the ground surface and, because of the large subsidence gradient, the phase-unwrapping methods of interferometric synthetic aperture radar (InSAR) are unable to give accurate results. Pixel tracking based on normalized cross-correlation maximization overcomes the limitations imposed by the subsidence gradient and can be used to monitor large displacements. This paper introduces and analyses each component of the offset field and then describes the improved method used to efficiently remove orbital error and topography-related offset caused by rugged terrain with the help of a digital elevation model (DEM). Eleven TerraSAR-X images in spotlight mode and Shuttle Radar Tomography Mission (SRTM) DEM data are used to monitor mining subsidence by the improved pixel-tracking method in Shenmu County of Yulin City. The root mean square error (RMSE) between the improved method and Global Positioning System (GPS) data in the strike and dip directions are 0.143 and 0.108 m, respectively. The approach presented here is shown to be appropriate for monitoring large vertical displacements in mining subsidence.