A Three-dimensional Modeling Study Of Oblique Photogrammetry Of Drones In The Western Alpine Region

Due to the high accuracy of terrain modeling in the adjacent terrain areas and the large overlap of 3D image processing in the traditional terrain measurement methods,it is easy to cause the failure of 3D image processing in the adjacent terrain areas,such as high resolution.To solve this problem,this paper focuses on the accuracy of topographic mapping in alpine areas.The main research work is as follows:(1)The three-dimensional modeling method of UAV tilt photogrammetry suitable for high mountain areas in Western China is studied,and a terrain adaptive aerial photogrammetry method of UAV flying like the ground is adopted.Based on the tilt photogrammetry technology,the rapid acquisition of image data in high mountain areas is realized,which effectively solves the problems of too large difference in image resolution caused by inconsistent aerial photogrammetry height;(2)In this paper,the layout method of image control points in mountain area under complex terrain is studied.Through modeling and analysis of several layout methods,a layout method can effectively reduce the number of control points and the complexity of complex terrain control points,and the loss of model accuracy is small;(3)Based on the existing aerial photography data processing platform and integrated into the research content of this paper,the rapid acquisition of large scale topographic map in alpine region is realized.Based on the quality evaluation of 3d modeling and large scale topographic map in alpine region,the fuzzy comprehensive evaluation system of achievement quality in alpine region was constructed by combining the fuzzy comprehensive evaluation method and the principle of maximum membership degree,which realized the objective evaluation of achievement in alpine region.The experimental results show that the median error of the topographic map in yangjuangou survey area is0.107 m and 0.105 m respectively.The median errors of the 50 mu topographic map are0.092 m and 0.101 m respectively.The precision meets the requirements of the corresponding specifications and the final quality of the two test areas meets the precision requirements of excellent products.