Abstract: Technique of UAV oblique photogrammetry has become the preferred method for 3D reconstruction of large scene because of its low cost and high efficiency. Model deformation, texture missing and other issues are often accompanied in the process of 3D reconstruction of oblique photography.In the construction of 3D digital campus based on the technology of low-altitude oblique photogrammetry, aiming at the problems arising from different types of ground objects after reconstruction, this paper proposes a method to construct a refined 3D model through the integration of space and ground,the combination of virtual and real by integrating the advantages of various modeling methods, which has important reference significance for the precise modeling of 3D model of low-altitude oblique photography.

Key words: unmanned aerial vehicle, 3D reconstruction, low-altitude oblique photogrammetry, space-ground integration, refined modeling