顾及地形断裂线的LiDAR点云滤波方法研究  

A Ground Filtering Algorithm for Airborne LiDAR in Consideration of Terrain Break Lines

作　　者：高广[1,2] 马洪超[1] 张良[1] 付晶[3] 

机构地区：[1]武汉大学遥感信息工程学院,湖北武汉430079 [2]宁波市测绘设计研究院,浙江宁波315042 [3]中国电力科学研究院,湖北武汉430074

出　　处：《武汉大学学报（信息科学版）》2015年第4期474-478,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(61378078);国家科技支撑计划资助项目(2012BAH34B02);中央高校基本科研业务费专项基金资助项目(2012213020203;2012213020209)~~

摘　　要：针对山区LiDAR点云的特点,对TIN滤波算法的三个重要环节进行了改进:1利用一种简单、快速的随机化格网搜索算法来获取更多的精确初始地面点;2提出一种地形预测角的判断准则来提高地形断裂线附近区域的滤波精度;3对每个激光脚点设置加密优先级,并在滤波过程中动态调整优先级大小,优先级高的激光脚点先进行判断,加密优先级的引入提高了TIN滤波算法对地形的适应性。最后,采用两块分布有大量地形断裂线的山区数据进行实验验证,并与传统的TIN滤波算法进行比较分析,结果表明,改进后的TIN滤波算法可以有效地保留山区的地形断裂线特征,提高了算法在山区的滤波精度。It＇s difficult to preserve terrain features,such as escarpments,terraces or terrain break lines,in filtering LiDAR data in mountain areas.According to the characteristics of LiDAR data in mountain areas,three important aspects of TIN filtering algorithm are improved：① more seed ground points are selected using a random strategy;② a new ground criteria called predicated terrain angle is proposed for preserving terrain break lines;③attaching apriority to each point and adjusting it during filtering,then points with higher priorities will be judged earlier.At last,some experiments on LiDAR data in mountain areas are made to verify the validity of the proposed method.Results show that the proposed method is very effective and useful for preserving terrain features and for improving the quality of filtering.

关 键 词：地形断裂线 LIDAR TIN滤波 地形预测角 优先队列 

分 类 号：P237[天文地球—摄影测量与遥感]