基于LiDAR点云数据进行地貌要素快速更新方法研究

Research on Rapid Updating of Geomorphic Elements Based on LiDAR Point Cloud Data

等高线、高程点、陡坎和坑穴是反映地貌形态的主要特征要素,传统方法一般以航空摄影测量或外业仪器测量方法获取空间坐标信息,在此基础上经过内业编辑进行更新,存在更新周期长、技术工序繁琐等问题。机载激光雷达(LiDAR)获取地面高程信息具有获取效率高,点云密度、精度高,地表信息表达全面、细致等特点。为了提高地貌更新的工作效率,对基于LiDAR点云数据进行地貌要素快速更新的方法进行了探索,并以1∶10 000比例尺地貌要素更新进行了试验,经验证,采用本文使用的方法进行地貌更新具有更新效率高、成果精度高等优点,效率相对传统航空摄影测量方法提高2倍以上。

The contour line, elevation point, scarps and craters were reflected the main characteristic elements of geomorphology, the traditional method of obtaining general space coordinate information in aerial photogrammetry or field instrument measuring method, on the basis of editing within the industry to update existing update cycle is long, complicated process technology etc. Airborne laser radar （LiDAR） to obtain ground elevation information to obtain high efficiency, the point cloud density, high precision, surface expression of comprehensive and detailed information and other characteristics, in order to improve the landscape update efficiency, update method of landscape elements LiDAR point cloud data based on fast are explored, and 1 ∶10 000 scale landform update elements were tested by using the proposed method has high efficiency, update the update features high precision results, the relative efficiency of traditional aerial photogrammetry to increase more than 2 times.