UAV Photogrammetry System In Large Scale Mapping Application

Unmanned Aerial Vehicles(UAV)technology as a new measuring tool,with the advantages of high efficiency,high resolution,low cost,low risk and can be reused.It has been widely used in disaster monitoring,mineral resources investigation,geodetic surveying,emergency disaster management and other fields.With the improvement of the overall level of domestic UVA and the rapid development of digital camera field,it is possible to make UAV as a means of producing large scale topographic map.In contrast to traditional topographic survey method,aerial remote sensing and satellite remote sensing,UAV photography measurement system has an incomparable advantage in the emergency system of emergency disaster and a certain range of rapid acquisition of high resolution images,which greatly improves the working efficiency of Digital Line Graphic(DLG),Digital Elevation Model(DLG),Digital Elevation Model(DEM),Digital orthographic image(Digital Ortho Map,DOM)etc,and has become one of the important technical measures for gis data acquisition.This paper takes the UAV photogrammetry system as the research object,specifically introduces the development status of UAV aerial survey system,the research status at home and abroad,the composition and working principle of uav aerial survey system,work flow,precision analysis and so on.Combined with working examples,this paper elaborates the working process of using the aerial photography of the eight-rotor uav with "sky line" and the digital three-dimensional mapping of EPS geographic information workstation to produce 1:500 large scale topographic map.Then,taking the aerial survey data obtained from the two areas of the xiyue village,zhangxi town,shaoguan city,guangdong province.and chengdu huayang nine ridges road.This paper studies and analyzes the precision of the uav aerial survey digital line drawing,and analyzes the main elements affecting the altitude accuracy of uav,and puts forward Suggestions for improvement.It provides a valuable reference for the practice of the 3D mapping system of unmanned aerial vehicles in large scale mapping.