三维激光扫描地形数据获取处理

利用三维激光扫描测量技术测得的点云数据获取数字地面模型的关键之处在于将地面点与非地面点进行分离。提出了一种基于高程直方图进行多阈值分割的方法。首先对点云进行离散化,然后进行多阈值分割分层,再对各层中的地面点进行连通,最后利用趋势面拟合法再次对各层地面点进行滤波,最终即可获取纯净的地面点。经试验验证,该方法有效可行。

Three-dimensional Laser Scanning Topographic Data Acquisition Processing

The key of obtaining digital terrain model through using point cloud data measured by three-dimensional laser scanning technology is to separate the ground points and non-ground points.This paper puts forward a method based on height histogram threshold segmentation.Firstly the author discretizes the point cloud data,and then goes to threshold segmentation and connects with the ground points of each layer, and finally uses trend surface fitting to each point to filter on the ground,eventually can obtain pure ground points. It has been verified by experiment that this method is effective and feasible.