机载LiDAR数据的多回波信息分析及应用研究

本文通过分析机载LiDAR系统获取的激光数据的多回波特性,阐述了多回波信息对地物类型信息的揭示作用,并将多回波特性用于减少参与滤波的激光脚点数量。实验证明,本文提出的滤波方案,可以预先剔除掉大部分的植被激光脚点和部分的建筑物激光脚点,既减少了参与滤波的数据量,又可以改善滤波算法对建筑物和植被的滤除效果。

Analysis of multiple returns of airborne LiDAR pulse and its application in filtering

A Laser pulse emitted by an airborne LiDAR system can receive multiple echoes,and the return number of a footprint is useful to determine the type of the object that reflects the above pulse.The above characteristic could be employed to reduce the number of points that are input for filtering.Particularly,the first echoes and the intermediate echoes were removed from the raw data,and they were also used to detect the non-ground points from the last echoes and the singular echoes,then only the reserved last pulses and the singular echoes were input for filtering in the paper.Experiments showed that the method could enhance the accuracy of filtering despite that the number of points input for filtering was reduced.