Research On Key Technologies Of UAV Aerial Image Free Control For Rapid Surveying And Mapping Large Scale Topographic Map

In order to provide rapid surface space information for the growing economic construction services,a new generation of Surveying and mapping technology,UAV aerial camera system,emerged at the historic moment.UAV aerial photogrammetry aims at acquiring high-resolution images and mapping large-scale topographic map data.On the basis of exemption from external image control,it lays out basic routes and extra-frame routes,and uses POS-assisted aerial photogrammetry to measure large-scale topographic maps.In production practice,many surveying and mapping units have carried out a lot of experiments and practices,and accumulated a lot of work.A lot of valuable experience and achievements have proved the feasibility of using UAV aerial survey to measure large-scale topographic map.The specific contents of this paper are as follows:1.The structure and function of UAV aerial photography system are introduced systematically.The routine operation flow of UAV aerial photography system in mapping large-scale topographic map is expounded.The principle of aerial triangulation is mainly explained,and the accuracy of different adjustment methods is compared and analyzed.2.Several key measures for fast measuring large-scale topographic maps without image control are analyzed and put forward: laying out the framework route,GPS post-processing technology,differential POS-assisted adjustment,self-calibration calculation of the camera in the air-three processing system and error model taking account of exposure delay.Other measures such as composite wing attitude stabilization platform,hot shoe flash technology,the influence of CCD placement position and overlap are also discussed.The influence of degree,etc.3.Using UAV aerial photography system to make 1:500 topographic map by image-free control,and using CW-10 C aerial photography system of Chengdu Longitudinal and Horizontal Dapeng series UAV to test flight in a survey area of Huzhou City,Zhejiang Province,the accuracy of its results report is analyzed and analyzed to demonstrate the feasibility and validity of several key technologies of image-free topographic mapping.The research and experimental results of this paper have high application value.