Abstract: For towering irregular buildings, terrestrial 3D laser scanner are suitable for measurement and modeling. In practical applications, the terrestrial laser scanner is limited by the viewing angle, which will lead to the lack of point cloud models. Although the point cloud of UAV oblique photography is relatively complete, the bottom is poor and the accuracy is low. The two kinds of point cloud models are registered can perfect a single point cloud model. The difficulty of the registration is that the accuracy, density, coordinate systems and size of the two kinds of point cloud models are different, and they have a large angular deviation. For this difficulty, this paper discusses the registration process, introduces the registration parameters and calculation methods of the two kinds of point clouds, and selects the overlapping part of the two kinds of point clouds to divide the high-precision pieces, and selects the corresponding feature points to register the high-precision pieces. An irregular building, Tianbao Pavilion, is selected for experiments, and the proposed method is compared and analyzed to verify the effectiveness of the method in this paper.

Key words: terrestrial 3D laser scanner, oblique photography, point clouds, registration, irregular buildings