正射影像辅助下的LiDAR点云构建DEM方法

提出了结合两类数据的DEM生成方法,该方法先将原始LiDAR点云自动滤波得出粗略地面点,经数据抽稀后提取地面关键点点集,再利用航迹文件和相机文件进行空三加密生成数字正射影像。在此基础上将粗分类点云与正射影像匹配,在少量人工干预下,对点云进行二次分类获得精确地面点点集,构建DEM。实验结果表明该方法是可行和有效的。

Construction Method of DEM for LiDAR Point Cloud Assisted by Orthophoto

In this paper,we present a DEM generation method combining two kinds of data.In this method,we filtered the original LiDAR point cloud automatically to obtain rough ground points,and extracted the point set of ground key point after data thinning.Then,we used the track files and camera files for aerial triangulation to generate digital orthophoto.On this basis,we matched the rough classification point cloud with the orthophoto,and with a small amount of manual intervention,reclassified the point cloud to obtain accurate ground point set and construct DEM.The experimental result shows that the method is feasible and effective.