EXTRACTION OF RIDGE LINES AND VALLEY LINES FROMMOUNTAINOUS LIDAR GROUND POINT CLOUD
1)Institute of Surveying and Spatial Information，Chang’an University，Xi’an 710054
2)China J K Institute of Engineering Investigation and Design，Xi’an 710043
Abstract：A method of the extraction of ridge lines and valley lines from mountainous LIDAR ground point cloud is presented. We extracted the normal vector and curvature of ground data based on differential geometry theory and local polynomial fitting，acquied the ridge points and valley points by computing extremum coefficient of curvature, generated ridge lines and valley lines based on the principle of minimum spanning tree. The results show that the method is feasible and effective.
