Rapid extraction and reconstruction method for data power line of airborne LIDAR

Abstract

The invention provides a rapid extraction and reconstruction method for a data power line of an airborne LIDAR. The method comprises the following steps of: acquiring a large amount of laser point cloud data by using an airborne laser radar measurement system, and filtering the laser point cloud data by properly setting an elevation threshold value to reject point cloud data not formed by a power line; after the filtration of the point cloud data is finished, rejecting a pylon according to the variation characteristics of point cloud density on the two sides of the pylon; counting the point number of each layer of power line in the point cloud data of the power line by adopting a histogram counting analysis method, layering the power line, and fitting the power line in the same layer, thereby separating point cloud data on a single power line; and fitting the power lines by utilizing a catenary equation, estimating a catenary equation parameter, and finally realizing the vectorization of the power line. By the method, automatic power line extraction and pylon extraction between a plurality of spans can be rapidly realized, and extraction efficiency is high; and the method can be used for the transmission line safety inspection of a power sector, and transmission line inspection efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of surveying and mapping, and more specifically, to a method for fast extraction and reconstruction of airborne LIDAR data power lines. Background technique [0002] The spatial positioning measurement accuracy of the current helicopter line inspection technology is not high, and the helicopter equipped with the LIDAR (light radar) system can just solve this problem better. The airborne LIDAR system can obtain aerial digital images and laser point cloud data, and the data can be processed to detect safety faults on the ground and objects in the transmission line corridor. At present, the laser radar system has been used in the survey, design and maintenance of the power grid in foreign countries, while our country is in its infancy. [0003] Lidar technology detects power lines, the key is the identification and reconstruction of power lines. At present, some scholars have studied this and achieved certain...

AI Technical Summary

Problems solved by technology

The extraction rate of this method reaches 93.8%, but it is not suitable for data with sparse point clouds

The power line detection module in Finland's Terrasolid software can realize the detection of power lines and the distance measurement to ground objects, but it cannot detect power lines across multiple spans

[0004] It can be seen that in the power line extraction technology in the prior art, there is currently no better method that can automatically identify power lines and realize power line extraction between multiple spans

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