Application Of Photogrammetry Based On UAV In Surface Collapse Deformation Monitoring

The Problem of surface collapse deformation monitoring is related to the safety of people's life and Property,and has been a key research topic in the Geotechnical Engineering and the Geological Disaster area;At present,the methods of surface collapse deformation monitoring are main the instrument measurement and the 3d laser scanner,but they have some limitations,such as local measurements,measurement of dead Angle,and high cost measurement;the UAV photogrammetry technology has developed fastly in recent years,which is low cost,high efficiency,high precision,large amount of information,and the advantage of can reuse.It can make up for the inadequacy of traditional measurement method,Providing a new method for surface collapse deformation monitoring.This paper combines the UAV photogrammetry technology in disciplines of surveying and mapping with the consumer UAV.and appling it to the Problem of surface collapse deformation monitoring.The main studies and results are as follows:(1)The UAV photogrammetry system includes flight system,mission load and ground system,and its subsystems;This paper studies the basic principles of photogrammetry,and studies the technical parameters of the DJI 3Pro which is used for taking photos in the wild and internal Processing software,and analyzes the advantages of UAV photogrammetry in the application of surface collapse deformation monitoring.(2)The non-measuring camera has a large optical distortion,so the camera must be calibrated before using.In this paper,the author studies the calibration method of using the Matlab software camera calibration toolbox,to obtain the parameters of the camera and imProve the precision of the model.And the calibration error is analyzed.(3)Design the accuracy of the test about UAV photogrammetry system.And quantitative analysis of horizontal precision and elevation accuracy for different GSD and different number of control points about aerial data.through the data Processing,Six control points are set up at the corner point and the central region to achieve better precision.Also horizontal precision and elevation accuracy of the unmanned photogrammetry system are obtained with different GSD and different number of control points.(4)The surface collapse deformation of the western collapse area of Cheng-chao iron mine is studied.As an engineering example,use the unmanned aerial vehicle(UAV)to carry out a three-period aerial photography in the research area,establishing and optimizating the 3d mode.Export the point cloud information for the model;Deformation analysis is carried out in the collapse area.