Accuracy Analysis of Substation 3D Model Based on Oblique Photography

Substation safety is extremely important to the electric power system. In order to improve the efficiency of substation inspection, a three-dimensional model of the substation can be used to set the inspection route and improve the work efficiency. In this paper, parameter experiments of oblique photography 3D modeling of substation drones are conducted. Four different UAVs were used for oblique photography 3D modeling. The UAV models, flight heights and modeling software were set up to control the experiments. The best accuracy of the 3D model was obtained when the DJI Mavic 2 Enterprise was used for oblique photography of the substation at a flight altitude of 40 m, and then the 3D modeling was performed with ContextCapture software. Under this condition, the image data of the substation was obtained by oblique photography by selecting the appropriate overlap rate of the side phase and the overlap rate of the heading. Then, after aerial triangulation, multi-view image dense matching, irregular triangulation network construction and texture mapping steps to obtain the substation 3D model for inspection route setting.