Large Scale Measurement Technology And Application Research Of UAV

With the development of drone technology,the technology of acquiring data and processing data by UAV aerial photogrammetry system has been gradually improved,and the accuracy of the products obtained by it has become higher and higher,which has been a powerful complement to traditional measurement.Compared with traditional measurement,the UAV aerial survey is flexible and efficient and can transfer a large amount of field work to the indoors,reducing the workload of the field and reducing the operating cost In the basic surveying and mapping,mine survey,highway line selection,disaster assessment The crop census,cadastral survey and other fields have obvious advantages and are recognized in various fields.This paper focuses on the large-scale mapping technology and its application of drones.The main research contents and achievements of the thesis include:(1)Introduce the composition and working principle of the aerial photogrammetry system of the drone.The hardware composition and operation flow of the system are introduced in detail,and the advantages of the aerial survey of the drone compared with the traditional measurement are explained.(2)Research cm the key technologies of UAV aerial photogrammetry system,including image control point measurement,data preprocessing,aerial triangulation,image matching and fusion,and production of surveying and mapping products,such as DEM,DOM,tilted real three-dimensional Model and DLG.Among them,the methods of lens distortion correction and external orientation element optimization in data preprocessing and the principle of regional triangulation in beam method are studied.(3)Combining the specific engineering examples,the two methods of vertical photography and tilt photography are used respectively.Firstly,the results of the empty three encryption obtained by Pix4Dmapper soft.ware are used to generate stereo image pairs in MAPMATRIX software for manual stereo mapping to produce 1:500 digit lines.Draw a picture.Then use Context Capture software to obtain the real-life 3D model of the survey area,load it into the EPS workstation 3D mapping module for vectorization,and collect the production line map.The accuracy of the 1:500 line drawing obtained by the two methods used in this paper is compared,and the results are analyzed.The two methods based on the small aerial drone aerial photogranunetry system are used to measure the 1:500 scale topographic map.Accuracy can fully meet the requirements.Among them,using the tilt photography technique,the DLG results are directly acquired on the generated tilted real-world 3D model,and the accuracy in plane coordinates and elevation is higher than that of the conventional vertical photography method.It does not need to wear stereo glasses and handwheels,and the operation method is simple and easy to use.However,this method requires high quality of hardware and model in the process of drawing,and it also increases the operating cost.Figure[29]table[10]reference[59]...