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机载LiDAR技术能够快速获取整个矿区地表空间位置及垂直相对位置的动态变化量,观测结果更为全面、直观,从而可以获得整个矿区地表开采沉陷分布与移动下沉情况。从点云数据滤波入手,对获取的鹤壁矿区两期点云数据提取的DEM作差值计算,得出该段时期内地表的垂直位移量,然后通过设置高差阈值和面积阈值,并采用基于高差分析的方法,提取地表沉陷信息。试验结果表明,该方法提取的沉陷面积精度能达到94.75%,可在中小尺度上对矿区开采沉陷进行监测。
The on-board LiDAR technology can quickly obtain the dynamic change of the spatial location and the vertical relative position of the entire mining area, and the observation results are more comprehensive and intuitive, so as to obtain the subsidence distribution and movement sinking of the surface mining in the entire mining area. Beginning with point cloud data filtering, we calculate the difference of DEM extracted from the two points cloud data of Hebi mining area, and get the vertical displacement of the surface in this period. Then, by setting the height difference threshold and area threshold, Height difference analysis method to extract surface subsidence information. The test results show that the accuracy of the subsidence area extracted by this method can reach 94.75%, and the subsidence of the mining area can be monitored on a small scale.