Study of the Effect of Oblique Photography Route Overlap Rate on 3D Reconstruction

The side overlap rate and heading overlap rate of the oblique photographic route are an important factor affecting the 3D reconstruction. The heading overlap rate and the side overlap rate determine the number of images and thus affect the model accuracy and modeling time. In this paper, in order to investigate the influence of oblique photographic route overlap rate on 3D reconstruction, oblique photographic images of substations with different combinations of overlap rates were acquired by using DJI Mavic 2 Enterprise for oblique photography at 40 m height, and then 3D reconstruction was performed to obtain 3D models of substations. The final experimental results proved that as the overlap rate increased, the number of acquired images increased, and the 3D model obtained by the three reconstructions had higher accuracy, but the data acquisition time and modeling time also increased greatly. Considering the model accuracy and modeling work efficiency, it is more appropriate to use about 80% of the heading overlap rate and the side overlap rate for the 3D reconstruction of general substations.