摘要
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,这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。
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 can be employed to reduce the num- ber of points that are input for fihering. Particularly, the first echoes and the intermediate echoes could be removed from the raw data, and be 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. Experiments showed that the proposed method could enhance the accuracy of filtering and re- duce the amount of points input for filtering.
出处
《测绘科学》
CSCD
北大核心
2013年第3期28-30,共3页
Science of Surveying and Mapping
基金
国家自然科学基金(41001280)
中国博士后基金(2010047038)
对地观测技术国家测绘局重点实验室开放基金(K201003)
中央级公益性科研院所基本科研业务费专项资金(7771121)
