Study On The Dangerous Area Extraction Of Transmission Line Passage Based On LiDAR Data

With the rapid development of the national economy,China’s power industry is accelerating.Transmission lines have become increasingly widespread in the wilderness.The growth of trees on the downstream passage of transmission lines presents a great safety hazard to transmission lines,and it is necessary to regularly inspect and remove trees that have highly threatening to transmission lines.At present,the inspection and maintenance of transmission lines still rely on manual field surveys or helicopter patrols.This type of conventional manual patrol line has high labor intensity,hard working conditions,low efficiency,high cost,and poor safety.Therefore,based on UAV high resolution multi-spectral remote sensing imagery and LiDAR point cloud data,this paper studies the extraction methods of potentially hazardous areas in forest area transmission lines,and accurately extracts hidden danger trees and the dangerous sections of transmission lines in the downstream passages of transmission lines.Improve the efficiency of inspections of transmission lines and the safety of line inspection personnel,and reduce labor intensity and line inspection costs.The main work of the thesis is as follows:(1)An improved watershed segmentation algorithm based on marker control is proposed for high-resolution remote sensing imagery in downstream forest area of transmission lines.In this paper,the NDVI vegetation index calculation,morphological reconstruction,color vector space gradient calculation,marker control,watershed segmentation and other calculation processes can effectively remove the influence of transmission lines and other backgrounds,and achieve high-resolution remote sensing image crown segmentation and crown polygon extraction.(2)There are phenomena such as discontinuity,non-smoothness,null value,or noise in the crown height model(CHM)obtained by the difference operation of the digital elevation model(DEM)and the digital surface model(DSM).The median filter algorithm is used to perform smooth operation and optimization on CHM,and the height of single tree canopy is obtained by using spatial superposition analysis to calculate the maximum value within the canopy polygon of each plant.(3)According to the data of single tree crown,tree height,transmission lines and other data,this paper proposes an automatic extraction method for the potential danger area of the upward transmission line in the forest area.By calculating the headroom distance between the individual canopy and its upstream transmission line,the individual trees and canopy areas that pose a potential risk to the transmission line are accurately extracted to achieve the purpose of regular inspection and removal of tree barriers.