Various types of buildings, indoor spaces, squares, mines, tunnels, shopping malls, public facilities, industrial plants, substations, high-speed rail stations, subways, cultural relics, and ancient buildings all need to be managed digitally. The results of this project can be used for high-precision mobile 3D laser scanning and 3D reconstruction. It can achieve building mapping, cadastral mapping, floor plan, elevation drawing, indoor 3D modeling, management, restoration, and updating of 3D facilities and equipment of buildings, etc.