Research On Multi-level Fuzzy Comprehensive Evaluation Of 3D Modeling Accuracy Of UAV Tilt Photogrammetry

With the rapid development of UAV technology,3D modeling of UAV tilt photogrammetry is widely used in digital earth,smart city development planning,smart tourism,land resources and other aspects,in order to promote its more common in all walks of life.Application,it is crucial to accurately grasp the actual accuracy of 3d model.Due to the complexity of UAV tilt photogrammetry 3d modeling system,its accuracy is affected by many factors and has great uncertainty.Therefore,it is of great theoretical significance and practical value to study the 3d modeling accuracy of UAV tilt photogrammetry.Based on the basic principle of 3D modeling of UAV tilt photography,this paper analyzes and determines the main factors affecting the accuracy of 3D model of UAV tilt photography.The analytic hierarchy process and fuzzy comprehensive evaluation method are used to construct the UAV tilt photogrammetry.The multi-level fuzzy comprehensive evaluation model of 3D modeling accuracy provides convenient and quick method and technical support for 3D modeling accuracy evaluation of UAV tilt photogrammetry.The main research work and results of the thesis are as follows:(1)Analysis of influencing factors on 3D modeling accuracy of UAV tilt photogrammetry: Based on the basic principle of 3D modeling of UAV tilt photogrammetry,combined with the basic flow and key technologies of UAV tilt photogrammetry 3D modeling,In theory,the systematic analysis of the error sources of 3D modeling,combined with experimental analysis,determines the main influencing factors affecting the 3D modeling of UAV tilt photography.(2)AHP-based 3D modeling accuracy evaluation index system for tilting photogrammetry of UAV: The complex UAV tilt photogrammetric 3D modeling system from top to bottom into target layer,factor constraint layer and solution layer Based on AHP,the 3D modeling accuracy evaluation index system of UAV tilt photography is constructed.By calculating the weight of each index factor,the relative importance of each factor affecting the accuracy of 3D construction is determined.(3)Multi-level fuzzy comprehensive evaluation model for 3D modeling of UAV tilt photogrammetry: In the analytic hierarchy process,when constructing the pairwise judgment matrix and checking the consistency of the judgment matrix,there are problems such as the uncertainty of the result and the large amount of calculation.Introduce the fuzzy comprehensive evaluation method,use the triangular fuzzy number to improve the index weight calculation,and the index The factors are divided into continuous type and discrete type,respectively,to determine the membership function,and to construct the fuzzy mapping of the lower level to the upper level,thus establishing a multi-level fuzzy comprehensive evaluation model for 3D modeling accuracy of UAV tilt photography.(4)Case application research: Using the multi-level fuzzy comprehensive evaluation model of the 3D modeling accuracy of the UAV oblique photographic measurement,the multi-level fuzzy comprehensive evaluation example verification of the campus 3D modeling accuracy is compared with the measured accuracy.The model is verified by comparison with the measured accuracy.Accuracy and timeliness.