Ancient architecture continues the historical context and is the carrier of human civilization. With the development of society, the value of ancient buildings has gradually been highly valued by people. We must take active measures to protect and utilize ancient buildings. The process of protection and utilization requires accurate mapping of ancient buildings. The traditional structural drawings by architects and measured by ground close range photogrammetry can express the key parts and overall structure of buildings. However, due to the limitations of technical means, it is difficult to quickly map ancient buildings and clearly express the 3D space of buildings.

With the demand for mine production efficiency and production safety, many mines have proposed the concept of digital mine, and the data demand for digital spatial 3D information in mining areas are becoming more and more urgent. 3D data, 3D models and other technologies have been gradually applied to daily production and safety in mines. Among them, it is difficult and inefficient to obtain 3D data information by traditional surveying and mapping methods, while 3D laser scanning technology can quickly obtain massive point clouds with its unique advantages, which is very suitable for complex and dangerous areas such as mines.