Application of Unmanned Aerial Vehicle Digital Close-range Photogrammetry in Service Slope Deformation Monitoring
Aiming at the problems of low automation and intelligence,complex installation,damage to slope and others for the existing slope deformation monitoring technology,the deformation monitoring method for slope surface based on digital close-range photogrammetry with unmanned aerial vehicle is proposed.According to the related theories of digital close-range photogrammetry,the calibration method for digital camera internal parameters and the calculation method for the coordinates monitoring points are determined.A general deformation monitoring object which can be installed on the existing slope surface of digital close-range photogrammetry and total-station measurement is developed to realize the joint monitoring.The results show that digital close-range photogrammetry technology is relatively sensitive to slope deformation,cooperated with special design of deformation monitoring target.The spatial points RMSE(Root Mean Square Error)in the first and second phase are 3.3 mm and 1.7 mm respectively.The point RMSE of horizontal displacement monitoring is 3.5 mm,and the elevation RMSE of vertical displacement monitoring is 1.6 mm,which meet the accuracy requirement of national standard for landslide monitoring.Besides,the production of deformation monitoring target is reliable and inexpensive,and has high application value.
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