A high-precision channel slope deformation monitoring method based on airborne laser scanning point cloud

Shuangping Li, Min Zheng, Hong Xie, Xiaohao Zhang

Abstract: In view of the current situation of high cost and low efficiency of channel slope deformation monitoring, a method of high-precision deformation monitoring based on airborne laser scanning point cloud is proposed. Using the characteristics of airborne IMU positioning error accumulates with time, we combine the self-designed planar three-dimensional control target, intercept the cross-sectional scan line through the vertical plane of the target link, and use the slope gradient analysis method to extract the monitorable area. After aligning the cross-sectional scan lines of the two phases of data and calculating their deformation variables, the final deformation results are analyzed. In this paper, the airborne laser scanning point cloud data of the South-North Water Transfer Project are used for experimental analysis, and the experiment proves that the deformation detection accuracy of this method can reach millimeter level.