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Issue:
Extracting Bridges from Airborne LiDAR Data Based on Terrain Features
Author(s):
LI Yunfan1 MA Hongchao1 WU Jianwei1 ZHONG Liang1
Pages:
552
-
555
Year:
2011
Issue:
5
Journal:
Geomatics and Information Science of Wunan University
Keyword:
机载LiDAR
;
桥梁提取
;
Alpha-shapes
;
地形特征
;
Abstract:
提出了一种从机载LiDAR点云数据中提取水陆桥梁的新算法,采用先滤波分类再识别桥梁的策略用于桥梁主体及其与地面连接处脚点的提取。首先对机载LiDAR点云数据进行严格滤波,在此基础上利用多个阈值对非地面脚点进行初步提取;然后引入Alpha-shapes算法对初步提取结果进行分割,并辅以面积阈值提取出属于桥梁主体部分的脚点;最后提出一种顾及地形特征的点云区域生长算法,用于准确提取桥梁主体与地面连接部分的脚点。实验证明,本文算法对水面和陆地桥梁提取均有很好的效果。
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