[Retracted] Digital Protection of Historic Buildings in Urban Planning

Table 2

Information levels of historic buildings.

Grade	Historical building information
1	Geometric information of historical buildings (buildings, component sizes, shapes, and spatial relationships)
2	Historical building composition information (building structural, maintenance, dependent and decorative components, and building surrounding environment)
3	Physical information of historical buildings (materials of buildings and components, existing state, and damage degree)
4	Historical building value information (history, science, art information, etc.)