Abstract: This paper studies the acquisition of building models based on inclined photography and the optimization algorithm to improve the accuracy. The existing building model acquisition methods cannot achieve good precision control, the building edge acquisition method is single, the acquired edge is not processed by algorithm. In view of this reason, a method of building edge line acquisition with constraint conditions is proposed and the algorithm research of building edge line precision is calculated based on the relationship between building edge line and wall. That is, with the given collection method and optimization algorithm, the acquisition method is firstly used to obtain the thick elevation line map of the building, and then these data are unified and optimized in batches. The optimization algorithm of acquisition method can effectively improve the accuracy of elevation line data from the acquisition stage and optimization stage respectively.

Key words: oblique photography 3D model, acquisition accuracy, architectural side line, simple interpolation adjustment method