Application Of High-precision UAV Remote Sensing Technology In Geological Route Selection Of Mountainous Highway

With the implementation and advancement of national development strategies such as “the Belt and Road” and “Western Development”,the national highway network is gradually improved to the mountainous areas with complex geological conditions.The traditional design concept of highway route selection focuses on the requirements of politics,economy,national defense and other aspects.Less consideration is given to the geological conditions such as topography,structure,and hydrology,resulting in frequent geological disasters such as collapses,landslides,and debris flows,which not only increases the cost of engineering construction,but also endangers the people’s lives and property.With the accumulation of engineering experience,the status of geological conditions in highway route selection has further increased,and engineering geology route selection has become a hotspot in the industry.UAV remote sensing technology has operations flexible,low cost,high precision and other advantages,which can effectively solve the problems of inconvenience,high risk,and poor visibility in traditional engineering geological surveys,and turn a large number of heavy field work into indoor,is the development trend of highway geological route selection in mountainous areas.Based on the reconstruction and expansion project of a highway in Guangxi,this paper studies the application of UAV remote sensing technology in the geological route selection of mountain highway,and develops a set of auxiliary highway route selection system based on ArcGIS Engine to promote the application of UAV remote sensing technology in the geological route selection of mountain highway.The main research contents and results are as follows:(1)Research on the configuration of UAV remote sensing system in mountain areaAiming at the characteristics of mountainous terrain,with parameters of flexible operation,endurance time,mission load weight,and image acquisition accuracy as control targets,through comparison and analysis of current equipment technical parameters and technical levels,a multi-rotor UAV,equipped with multiple large-capacity batteries,equipped with a five-lens tilt camera,and other UAV remote sensing system solutions suitable for mountain operations are proposed.(2)Research on high-precision UAV remote sensing image acquisition technologyFor the large terrain height difference in mountainous areas,adjust the route planning parameters such as ground resolution,flying height,and overlap.And choose the image control point layout method of the whole field,route network or regional network according to different terrain conditions.and choose the traditional or network RTK measurement method according to the network signal coverage,so as to obtain the UAV remote sensing image quickly and efficiently.(3)Research on UAV remote sensing image processing technologyMulti-source data is used for coordinate transformation,and the aerial triangulation is performed in combination with image control point data to obtain the external orientation elements required for each image.Aiming at the problems of image data distortion,poor visual effect and small image frame,the inverse solution method,bilinear interpolation method,SIFT algorithm,search for the best suture are selected for UAV remote sensing image processing.Finally,the high-precision 3D model,4D products and other results are obtained.(4)Design and implementation of high-precision UAV remote sensing assisted highway route selection systemUsing Visual Studio platform,ArcGIS Engine components,SQL Server database and other development tools for high-precision UAV remote sensing technology to assist the development of highway geological route selection system,to realize integrated display of 3D real scene model,geological disaster point data management,highway geological route selection and other functions.(5)Engineering application of high-precision UAV remote sensing technologyThe high-precision UAV remote sensing technology is applied to a highway expansion and reconstruction project in Guangxi.Hawa four axis eight rotor mapping UAV is selected,and the UAV remote sensing system composed of five-lens tilt camera is equipped.30 image control points are set up and measured accurately to obtain 36590 original aerial photos.Context Capure and other softwares are used to perform aerial triangulation and other processing on UAV remote sensing images to obtain 3D models and 4D results.Finally,the developed high-precision UAV remote sensing technology is used to assist the highway route selection system to complete the engineering geological route selection of the project.