机载激光点云数据中电力线自动提取方法
Automatic Power Lines Extraction Method from Airborne LiDAR Point Cloud
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摘要: 提出了一种从机载激光点云数据中自动提取电力线的方法。首先利用顾及地形起伏特征的机载激光点云自动滤波方法移除地面点,利用维数特征以及方向特征自非地面点中分割获得电力线激光点云;然后对获取的电力线点采用二维霍夫变换和最小二乘拟合的方法求取每条电力线的中心线方程,根据中心线方程求取每条电力线上的激光点完成单电力线目标提取,并考虑了电力线在水平投影面内重叠时的情况;最后根据分块质心解算方法生成每条电力线上的三维节点,输出电力线矢量。采用实际线路巡检实验采集的机载激光点云数据进行实验,实验结果表明,该方法能从机载激光点云数据中提取出完整的电力线,并具有较好的鲁棒性,对电力巡线具有一定的实际意义。Abstract: This paper present a power lines automatic extraction method from airborne LiDAR point cloud. Firstly, ground points are removed by automatic filtering method based on fluctuant feature of terrain. Vegetation points, building points and part pylon points are also removed by dimensionality feature and direction feature. Secondly, 2D Hough transform and least square fitting are used to fit center line equation of power lines. And then, the laser point of each power lines can be obtained by center line equation. In this step, power lines projection overlap in the horizontal plane are considered as well. Finally, block centroid calculation method is used to calculate 3D nodes of each power lines. These nodes are used to output the power lines vector. The experimental result shows that the proposed method can extract complete power lines from airborne LiDAR point cloud. This method has some practical meaning for power line inspection.
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