Automatically-extracting power line method in random laser point cloud data

A technology for automatic extraction of laser point cloud data, applied in radio wave measurement systems, instruments, calculations, etc., can solve problems such as blank power line inspections

Active Publication Date: 2013-11-27
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

In recent years, domestic airborne laser radar technology has also been app...

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  • Automatically-extracting power line method in random laser point cloud data
  • Automatically-extracting power line method in random laser point cloud data
  • Automatically-extracting power line method in random laser point cloud data

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[0042] (1) Theoretical basis

[0043] Due to the particularity of its own function and structure, the power line has strict requirements on its surrounding environment. Considering issues such as power transmission safety, the power line is higher than the surrounding features in the area. According to the relevant construction standards, the vertical distance between the power line and the adjacent features must exceed the relevant specified value (safety distance). Therefore, the elevation (Z direction) distribution of power line point cloud data collected by airborne LiDAR has distinct distribution characteristics, that is, within a certain area, the power line point cloud data and ground and other point cloud data are concentrated and distributed within a certain elevation range. . Based on this distribution characteristic, the method of elevation threshold segmentation can be used to achieve filtering, and the point cloud of ground points and some ground objects (such as...

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Abstract

The invention discloses an automatically-extracting power line method in random laser point cloud data. According to the automatically-extracting power line method, a ground point cloud is segmented and filtered through a point cloud of an elevation; on direction projection of the segmented point cloud, a straight line segment is detected and further back-projected to three-dimensional space so as to obtain a three-dimensional line segment; while the three-dimensional line segment serves as a clustering nuclear, a distance clustering method is used to obtain an accurate point cloud of the power line and generates a power line vector node based on the accurate point cloud of the power line; and a power line vector is outputted, so that automatic extraction of the power line is realized. The automatically-extracting power line method in the random laser point cloud data is efficient in extracting, and can automatically extract the power line.

Description

technical field [0001] The invention belongs to the field of airborne laser radar applied to power line inspection, and specifically refers to a method for automatically extracting power lines from disordered laser point cloud data. Background technique [0002] In order to realize the safe operation of the power grid, the power sector needs to conduct regular power line inspections in order to detect and eliminate potential safety hazards in a timely manner. For example, with the growth of offline vegetation, the safe distance from the top of the tree to the circuit is not enough, or new buildings are added offline or existing buildings are heightened, or tower poles and wires are damaged, etc., all of which may exist security risks. Airborne LiDAR technology can directly obtain a large amount of high-precision LiDAR point cloud data in the line corridor, which makes up for the gap that traditional aerial surveys cannot do for power line measurement, saves a lot of time an...

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Application Information

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IPC IPC(8): G06K9/46G01S7/48
Inventor 麦晓明陈驰王柯张泊宇陈锐民杨必胜彭向阳
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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