Aerial Triangulation And Accuracy Analysis Of 3D Model For Tilt Photography Of Consumer UAV

With the advancement of digital cities,three-dimensional digital cities have become an important means of urban planning and urban management,early warning of the future shape of the city,complete dynamic simulation of urban disaster events and emergencies,and obtain the scientific basis for the adjustment of urban planning programs to make Planning is more forward-looking,and the demand for urban 3D models is increasing.In recent years,the development of UAV tilt photogrammetry technology has changed the limitation of traditional aerial photogrammetry to perceive objects at a single angle.Sensors equipped with multiple cameras with different angles can obtain all-round image information of objects,and quickly and efficiently construct 3D urban real scenes.model.However,compared with oblique photography based on consumer-grade drones,it is widely recognized for its convenient operation,light weight,low cost,and no need to apply for airspace.Using it as a platform for tilting the camera for ground observation,based on consumer-grade drone tilt photogrammetry technology,little research has been done on the accuracy of results.For example,the problem of the layout of control points for aerial triangulation based on oblique photography of consumer-grade drones,and the accuracy analysis of single buildings in 3D models and model scenes.This article uses the consumer-grade UAV DJI Genie 4 equipped with a lightweight and convenient KG2000 Pro five-lens tilt camera to obtain image data from Beijing University of Architecture,and conducts in-depth research on tilt photogrammetry technology to solve the aerial triangle based on consumer-grade drone tilt photography Problems such as measurement,3D model of real scene,and accuracy evaluation of buildings in 3D scene model.The use of consumer-grade UAV tilt photogrammetry technology is better applied to smart cities,three-dimensional fine modeling,emergency disaster relief,etc.The main research contents are as follows:(1)Accuracy analysis of aerial triangulation:(1)Using consumer-grade unmanned aerial vehicle DJI Gen IV equipped with a light and convenient five-lens tilt camera for data collection,and using GPS-RTK technology to collect field control points.In the same measurement area,the same number of control points,and the same control point layout method,respectively,the acquired oblique images,down-view images,and multi-view images are compared for aerial triangulation accuracy comparison analysis;The data is measured by aerial triangle encryption,and the accuracy of errors in the plane and elevation is compared and analyzed;(3)For the image data obtained by consumer-grade drones,the experiment is based on four-point single-point layout,four-point group layout,uniform layout around the regional network,four corner Six control point layout methods of uniform distribution around the point network,uniform distribution of the regional network,uniform distribution of the regional network and four-corner point group participation in the aerial triangulation calculation and analysis of the results to obtain the residuals in the X,Y,and Z directions Use the medium error formula to calculate the plane and elevation errors,and evaluate the accuracy according to the specification of "Digital Aerial Photogrammetry_Aerial Triangulation".(2)Accuracy analysis of the real-world 3D scene model: According to the above-mentioned aerial triangulation results,the high-accuracy triangulation results are selected and introduced into the reconstruction of the real-world 3D model.Introduce the aerial triangulation encryption results of the uniform distribution around the regional network,the four-point group,the uniform distribution around the regional network,and the four-point group,to the three-dimensional reconstruction of the real scene.From the fineness of the model and the geometric accuracy of the model,Three representative aspects of line accuracy in the model analyze the accuracy of the urban true 3D model constructed with this method.(3)Analysis of detail accuracy of individual buildings in real-world 3D scenes: using 3D laser-scanned point cloud data as a standard data source,and models built using computer-aided modeling technology as standard data,for real-life 3D model scenes generated by oblique photography The single building regular facades and irregular facades in the detailed accuracy evaluation.