Research On 3D Modeling Of UAV Tilt Photogrammetry In High Mountain Area

In recent years,unmanned aerial vehicle tilt photogrammetry technology has been widely used in large-scale topographic mapping,urban planning and other fields due to its advantages of high speed,flexibility,low cost and high precision.National census and other aspects have played an important role.Although the unmanned aerial vehicle tilt photogrammetry technology has been widely used in various production and application departments,the research on the corresponding 3D modeling technology is also relatively common.However,most of the previous research focused on building a three-dimensional model with the city or a relatively concentrated area as the research object,paying attention to the details of modeling and the deformation control of the building.The project cost is relatively high,and a large number of later modeling technicians are required to participate.This article is mainly aimed at the areas where the vegetation in the mountainous areas of Yunnan is relatively lush.According to the drone tilt photogrammetry technology and rapid modeling technology,faced with the characteristics of low project cost,comprehensive data requirements,and fast data processing,the data processing in the modeling process is optimized and improved to fully ensure the quality of the model and improve the data The efficiency of processing,the accuracy assessment of the model results to ensure that the data accuracy meets the quality requirements.The main research direction of this paper is the 3D modeling of the unmanned aerial vehicle tilt photogrammetry technology in high mountain areas,and the application of subsequent model accuracy evaluation and 3D mapping.Using Context Capture software to improve the 3D modeling data processing flow,the overall accuracy of the mountain-based research area model has been evaluated,and the accuracy meets the specifications.The research content is as follows:First of all,this article introduces the related theoretical basis of Unmanned Aerial Vehicle tilt photogrammetry technology based on 3D modeling technology,including the classification,principle and characteristics of Unmanned Aerial Vehicle,the principle and characteristics of tilt photogrammetry,Unmanned Aerial Vehicle tiltphotogrammetry system and 3D modeling methods.The key technologies of 3D modeling of tilt drone surveying for drones are introduced,including image preprocessing,multi-view image joint adjustment,multi-view image dense matching,digital surface model generation and true radiographic correction,and texture mapping.It also mainly introduces The SIFT feature matching algorithm and the beam method for regional network adjustment,combined with the hash image clustering CMVS method and the patch model-based dense matching PMVS method for dense matching of multi-view images,digital surface model generation and orthophoto correction,and texture Mapping method.Then take the high mountain area as the research object,use Context Capture as the basic software for data processing,preprocess the image data obtained by the drone,use the Context Capture software for 3D modeling,display the results of the 3D model,evaluate the overall accuracy of the model,and build Process,improve the data processing method of 3D modeling,ensure the accuracy of the model,and improve the production efficiency.Finally,based on the data of 3D modeling,the EPS geographic information workstation was used to conduct an experimental study of 3D mapping of tilt photography,to evaluate the accuracy of data processing,and to illustrate the feasibility of drawing large-scale topographic maps in high mountain areas and the existence of the process Problem,quickly provide the basic geographic information data needed for the development of high mountain areas.