HIGH EFFICIENCY TOPOGRAPHIC SURVEY ON RESERVOIR BY UAV TILT PHOTOGRAMMETRY

The UAV tilt photogrammetry is a method that can be used to obtain large-area and high-precision 3D point cloud data after remote sensing and 3D laser scanning, which has the advantages of low labor intensity, high efficiency and little impact on the environment. It is widely used in various fields, and is in the trial stage in reservoir measurement. In this research, Guniubei reservoir was taken as the study area. The RTK (real-time dynamic difference technology) was used to obtain the coordinates of ground control points. The aerial photogrammetry were carried out by Dajiang spirit 4 UAV (unmanned aerial vehicle), with 35 photo control points and 42 check points, and then 3D model of reservoir was established. Evaluated by mean square error, Ms and M-H of root control points were 0.051m and 0.065m respectively, and the M-H of the detail points was 0.098m, which all met the accuracy requirements. For the tidal-flat area, the safety of UAV photogrammetry was much higher than that of manual field measurement. The outcomes of this research provide basis for comprehensive efficient topographic survey and reservoir capacity of hydraulic engineering.

Automated summary

UAV tilt photogrammetry is an effective and environmentally friendly method widely used in various fields. This research used UAV for photogrammetry and established a 3D model of the Guniubei reservoir. The evaluation results showed that the method met the accuracy requirements and had higher safety in tidal-flat areas. This research provides a foundation for topographic survey and reservoir capacity evaluation in hydraulic engineering.