关键词: 三维激光扫描, 点云, 万寿寺塔, 中轴线, 倾斜监测

Abstract: Aiming at the problem that adopting traditional measurement approaches to monitor the deformation with respect to ancient tower site is with complex process and low precision, this paper use 3D laser scanning method to perform the deformation monitoring while propose a slope calculation algorithm based on least squares principle. The method tirstly extracts the contour point cloud of each layer with respect to the tower first, then fits the center of each layer according to the principle of least squares, conducting linear fitting to extract the central axis of the tower, and finally calculates the tilt amount of the tower. Taking the deformation monitoring of Wanshou temple tower in Xi’an as an example, the experimental results show that the proposed algorithm can quickly calculate the inclination of the tower and improve the working efficiency in contrast to the traditional monitoring methods.

Key words: 3D laser scanning, point cloud, Wanshou temple tower, central axis, slope monitoring