Digital Protection of Hakka Condoms in Longnan Based on BIM and 3DGIS

In the BIM of digital protection of ancient buildings, in addition to providing three-dimensional information, it can also directly provide two-dimensional drawings for the restoration of ancient buildings, and visualize the repair process to preserve all stages of ancient buildings. Using the existing ancient architectural cultural heritage to make “clan” library, applied to architecture, BIM destroy the ancient architectural cultural heritage can complete the digital restoration of ancient architectural cultural heritage, BIM model not only supports the acquisition of ancient architectural geometric information, but also supports the management and preservation of attribute information. The combination of BIM and GIS, on the one hand, realizes GIS from outdoor to indoor, from macro to micro, and enriches the new generation of 3DGIS technology system; on the other hand, it enriches the application of BIM in the whole building life cycle. According to the list of the seventh batch of state key cultural relics protection units, there are 4296 national key cultural relics protection units, of which 1882 are ancient buildings, with 710 monuments and monuments.