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Geomatics and Information Science of Wuhan University. 2015, (04) Core

A Ground Filtering Algorithm for Airborne LiDAR in Consideration of Terrain Break LinesChinese Full Text

GAO Guang;MA Hongchao;ZHANG Liang;FU Jing;School of Remote Sensing and Information Engineering,Wuhan University;Ningbo Institute of Surveying and Mapping;China Electric Power Research Institute;

Abstract: 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.
Keywords：

terrain break lines; LiDAR; TIN filtering; predicated terrain angle; priority queue;

  • DOI：

    10.13203/j.whugis20130579

  • Series：

  • Subject：

  • Classification Code：

    TN958.98

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