Application Of UAV Aerial Photography System In Large Scale Topographic Map Measurement Of Hydropower Engineering

In the early stage of hydropower project construction,a large amount of terrain data needs to be collected in order to collect the data used in the project design.The low efficiency,poor precision and easy to be affected by the working environment of traditional measurement methods have brought great limitations to the design and construction of projects.As a military target drone first appeared in Britain at the beginning of last century,many countries attach more and more importance to the development and development of unmanned aerial vehicle.In particular,after discovering the civilian value behind the uav,we began to develop professional uav.As a platform to carry professional measurement camera,we began to apply it in the field of photogrammetry.New type of unmanned aerial vehicle(uav)is increasing in recent years,especially the uav automatic navigation technology and the widespread adoption of a new digital camera,greatly improve the efficiency of uav aerial system,the uav aerial photography measurement system as a new development direction of photogrammetric surveying and mapping industry were introduced,for digital image acquisition and the topographic map update.Due to the advantages of low cost,simple operation,flexibility and high efficiency,the uav aerial photogrammetry system makes up for the deficiency of traditional measurement.At present,as the unmanned aerial vehicle(uav)technology and the measurement the continuous development of digital camera technology,uav photogrammetry system technology also got rapid development,widely used in large scale mapping in small hydropower project area,good results have been achieved.This paper introduces the research background and current situation of the development of uav aerial photography system,on the basis of summarized the main component of the uav aerial system,the coordinate system of the uav aerial photography measurement system are introduced,the coordinate system transformation,image data preprocessing and matching and related theoretical basis.Combined with specific engineering projects systematically expounds the use of uav aerial photography system for large scale topographic map produced by the process flow and technical methods,including flight parameters calculation,route planning and installation,field,such as the control point BuCe flight preparation work before,and image data processing and spatial data collection and so on industry.Studied the uav aerial system from getting to the topography,the entire process of production and technology method,and the foreign industry as control points,three encryption,empty three main links such as locus of control,the quality of topographic map accuracy assessment.Paper a hydropower project in shandong weifang 1:2000 topographic map mapping project as the backing,and choosing Pix4 Dmapper software VirtuoZo2014 mapping system of the uav aerial system for the whole process of large scale topographic map drawing for this paper.Through the precision analysis of the topographic map,it is concluded that the 1:2000 large scale topographic map produced by the uav aerial photography system meets the requirements of the precision of the drawing.