Application of airborne LiDAR technology in geological hazard investigation in mountainous area with dense vegetation

doi:10.13474/j.cnki.11-2246.2021.0117

Abstract

Abstract: The geological hazards in densely vegetated mountainous areas of China are characterized by high position and high concealment. But the traditional methods of geological hazard investigation can not effectively solve the problem of early identification of hidden hazards. The airborne radar can obtain 3D laser point cloud with ground reflection intensity, which can not only provide high resolution and high precision two-dimensional image of topography, but also can "penetrate" the ground vegetation with multi-echo technology. The filtering algorithm can effectively remove the influence of the vegetation on the ground surface and obtain the true ground elevation data, so that the features of various terrain features and the signs of slope deformation in the relevant areas can be seen clearly. And the fine and accurate morphological features of the disaster body can be obtained. In this paper, the application of airborne LiDAR technology in Qiaoshan Park, Foshan City, Guangdong Province, has been studied. The results show that airborne LiDAR technology can improve the early identification ability of geological hazards in densely vegetated mountainous areas, which is helpful to improve the ability of comprehensive disaster prevention and reduction.

Key words: dense vegetation, mountainous area, airborne LiDAR, geological hazard investigation

CLC Number:

SUN Tao, XU Mingyu, DONG Xiujun, PAN Xing. Application of airborne LiDAR technology in geological hazard investigation in mountainous area with dense vegetation[J]. Bulletin of Surveying and Mapping, 2021, 0(4): 90-97.

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