Accuracy Analysis Of UAV Topographic Mapping

With the popularization of UAV and the development of technology,as a means of surveying and mapping,UAV is more and more sought by surveyors.The principle of UAV photogrammetry is to obtain the digital elevation model,digital orthophoto image and digital topographic map by using the UAV image obtained from field flight.Compared with the traditional surveying and mapping method,it has the characteristics of low cost,short operation period and simple operation,and can effectively save manpower and material resources and time.Based on the topographic map produced by UAV aerial photogrammetry data,this paper systematically studies the factors affecting the accuracy of topographic map produced by UAV aerial photogrammetry,deeply discusses the process and key technologies of large-scale topographic map production by UAV aerial photogrammetry,and respectively studies and compares the mapping accuracy of different industry processing software and the mapping accuracy of different terrains in detail.The main contents of this paper are as follows:(1)Describing the effect of the angle of tilt and rotation,the degree of air strips curvature,the maximum height difference,the factor of flying altitude,the degree of image overlap,the setting of image control point and camera placement on UAV mapping accuracy in detail.(2)By using three different software,such as Inpho,Pix4 Dmapper and ContextCapture,the aerial photogrammetry data of Guizhou mountainous areaare edited,and the precision of hollow three encryption in the production process is discussed through the production of Dom.By using the accuracy of DOM,this paper analyzes and compares the influence of these three softwares on the mapping accuracy and the applicability of the software,andit is demonstrated that the aerial photogrammetry data of UAVs in the mountain area of Guizhou meet the requirements of drawing accuracy of 1:1000.(3)The inpho software was used to make dom in the old and rural areas of Yuanmou County,Yunnan Province,Luoyang Town,Ruyuan Yao Autonomous County,Guangdong Province,and Zunyi Pingzheng Hongxing County,Guizhou Province.Make topographic map in the mapmatrix software vector mapping module,thenverify and analyze the precision of digital topographic map through actual dotting and checking.Explore and compare the accuracy of UAV mapping under the three different terrain conditions of mountain area,plain and hill.and it is proved that UAV is suitable for engineering survey of different terrain.