基于特征差异的机载LiDAR侵蚀沟点云分割方法

为克服数字高程模型(Digital Elevation Model, DEM)提取侵蚀沟特征的局限性,提出一种基于机载激光雷达(Light Detection and Ranging,LiDAR)点云的不同尺度下的表面特征差异侵蚀沟点云分割方法。该方法首先对侵蚀沟点云进行特征分析,在对点云预处理的基础上,基于不同尺度获取点云表面特征差异,再结合曲率阈值方法分割得到初始侵蚀沟,最后基于聚类分析得到侵蚀沟点云。试验结果表明,该方法能够精确地从机载LiDAR点云中分割得到侵蚀沟,为侵蚀沟的定量评价提供了一种新思路。

Point Cloud Segmentation of Erosion Gully from Airborne LiDAR Data Based on Characteristic Difference

To overcome the limits of Digital Elevation Model in extracting erosion gully features,a method of point cloud segmentation for airborne LiDAR data based on characteristic difference is proposed.Firstly,the characteristics of point cloud of gullies are analyzed,and then the differences in surface features are obtained based on different scales after preprocessing of the point cloud.Initial gullies are segmented from point clouds with the aid of a curvature threshold.Finally,real gully point clouds are obtained based on clustering analysis.The experimental results demonstrate that gullies can be detected accurately with airborne LiDAR point clouds,and the present method provides a new idea for quantitative evaluation of gullies.