Study On The Application Of Tree Detection Based On Airborne LiDAR In Power-line Inspection

It’s a new application method of ground detection and position for Airborne LiDAR measurement technology,which’s being widely used in various of fields such as Railway Survey and Design,Urban Modeling,Forest Resource Management,even Surveying and Mapping,especially in digital power line,public attention that has already been attracted too much.The transmission line,as we all know,crosses regional distribution greatly,and the terrain is extremely complex,even the wire is struck by thunder-strike and arcing-over or affected by continuous mechanical strain as well as material aging and icing factors,which’s accustomed to be long-term exposure in the wild,resulting in some phenomena of abrasion and corrosion that must be done on schedule in Digital Power Grid Engineering.In general,it’s obvious that the traditional method is not only a tedious quantity of work and tough conditions,but it’s also more likely to take much longer time,high labor costs or extreme difficulty for mountains and rivers.However,Airborne LiDAR technology plays its own advantages that there are any essential changes in these problems.Theoretically,some feature points below wire distance and potential safety hazard points can be extracted rapidly through the 3D visualization of geographic information access corridor environment of power line.Considering the situation,this paper is engaged in the detection of the hidden dangers in the tree of Pingyuan County of Meizhou.Taking various factors into consideration,this paper takes full advantages of Region Growing and Gradient Segmentation Algorithm and Canopy Height Model to extract trees,but to study some analysis on the security of actualizing the obstacle in overhead transmission lines.For the above,some related research achievements are as following:1.In recent decades,some interrelated literatures have been understood at home and abroad.Yet the principle of each sensor system of Airborne LiDAR is completely analyzed so that the implementation mechanism of each sensor system is thoroughly mastered,which provides a basis for integrated systems.On the basis of practical experience,five common navigations coordinated systems based on the mathematical foundation of Inertial Navigation or basic principle are inferred in detail,when Airborne LiDAR data precision processing route related is summarized comprehensively,prepared for obtaining high quality precision of point cloud data.2.From the perspective of the characteristics of data,some efficient organization management methods of point cloud data are carried out.This paper makes a brief introduction about Discrete Points K Nearest Neighbor Query and Bounding Box and Octree Queries,but the application of Grid Block K Nearest Neighbor Query is organized on them,which greatly improves the efficiency of data processing,and lays a good foundation for the subsequent filtering and classification.3.Based on the spatial distribution pattern of the point cloud,this paper analyzes the geometric features of the ground point.Because of the trees and buildings of Laser Point with similarities and differences in the vertical direction and horizontal direction,so this paper can use of regional continuity and non-continuity or attribute consistency based on DSM and DTM to extract feature points by a large area threshold for trees and buildings.Above all,it’s extremely important to set the appropriate elevation threshold,which studies on Regional Growth and the Gradient Segmentation with Canopy Height Model method so as to obtain higher vegetation.4.In view of related analysis of hazardous point warning avoidance of transmission line extraction based on higher trees above.It’s a reference basis for the operation of overhead transmission lines that wire does below the horizontal distance and vertical distance about feature point will be tested,aiming at discriminating the actual point of risk distinguishing location information.