Method for rapidly extracting height of forest obstacle of power grid transmission line

Abstract

The invention discloses a method for rapidly extracting the height of a forest obstacle of a power grid transmission line, and the method comprises the steps: employing a sub-meter high-resolution optical stereo image pair image and an RPC file, combining with a high-precision control point collected on the ground, and extracting high-precision earth surface DSM and point cloud data through processing; on the basis, classifying the point cloud data by adopting a filtering classification technology, correcting ground points in a classification result by integrating ground feature features in a satellite image, and generating a DEM (Digital Elevation Model) through interpolation; and finally, establishing a forest tree crown height extraction method based on a DSM and DEM space phase difference model, and verifying the precision of the method through on-site acquisition point locations. According to the method, the problem that the height extraction precision is out of control due to DEM in an original space phase difference calculation model is solved.

Description

technical field [0001] The invention belongs to the field of remote sensing image power grid security applications, and in particular relates to a method for quickly extracting the height of tree obstacles on high-voltage transmission lines. Background technique [0002] High-voltage transmission lines directly use air as an insulator. Usually, the height design of transmission lines follows the national standard. However, due to the growth of trees or extreme weather, the trees will touch or be close to the power lines, which will easily cause trees to conduct electricity or line trips, endangering the safe operation of power lines. As a result, power outage accidents are caused, and fires are caused in severe cases, resulting in major economic losses. According to the requirements of my country's overhead transmission line operating regulations, when the maximum sag is required for lines of 220KV and above, the safe distance between the conductor and the tree should not be...

AI Technical Summary

Problems solved by technology

The Ziyuan No. 3 three-dimensional surveying and mapping satellite launched by my country is a milestone in the development of surveying and mapping in my country. Its front-view, rear-view and front-view panchromatic ground spatial resolutions are 3.5 meters, 3.5 meters and 2.1 meters respectively. The ground spatial resolution of the multispectral camera With a length of 6 meters, it can be used as production data for large-scale topographic maps, but there are still shortcomings in stereo mapping with high precision requirements such as forest obstacles

The existing tree height calculation model uses the difference between the DSM and the digital elevation model (DEM) to obtain the tree height in a large area, but the DEM is still generated by interpolation of the topographic map collected in the previous stage, so the measurement accuracy of the tree height cannot be guaranteed. Can not meet the requirements of high-voltage transmission line safety monitoring

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