Construction and Practice of BIM Model of Longnan Hakka Enclosed House Based on Point Cloud Data

The Hakka enclosed house is the carrier of the material civilization and spiritual civilization of the Hakka people. It has a high historical and cultural value, as well as a high scientific, technical, aesthetic and artistic value. In recent years, with the rapid development of 3D data acquisition technology and the diversification of acquisition methods, target recognition and 3D reconstruction based on 3D data have become the research focus of many scholars and experts at home and abroad. This paper is based on the ground point cloud data obtained by 3D laser scanning technology, based on the upper image of the building obtained by the remote control aircraft photo, and proposes a method of fusion of ground point cloud and remote control image, and BIM of the building in Revit. The model is studied, and the experimental results of the reorganization of the object model show that the accuracy of the reorganization model can meet the requirements of small-scale scene construction, and the building model based on the BIM platform can convey rich attribute information and further explore the application value. And after using point cloud data to study the spatial form, spatial content and its deep cultural connotation of the Hakka enclosure, the design essence, cultural ideas, spatial pattern and landscape elements in the Hakka enclosure are refined, and the point cloud data technology is used to establish Longnan. The BIM model of Hakka enclosures further provides constructive views on the protection, application and organic development of enclosures, and the coordinated development of modern culture, design and architecture.