ABSTRACT
With the evolution of modern cities, architectural cultural heritage occupies an important position in the preservation of traditional culture in China, especially the ancient buildings of the Ming and Qing dynasties, which are at the last peak in the history of ancient architecture, and their unique architectural styles and surviving more complete architectural bodies have attracted the attention of scholars in various fields. Digital management and application of ancient building models are important to conservation work. However, the currently constructed 3D ancient building models still have problems such as unclear semantic expression, lack of spatial topological relationships, and poor model visualization, making the existing models unable to meet the needs of semantic query, spatial analysis, data mining, and other deep-seated applications in the field of ancient building conservation. City Geography Markup Language (City GML) is a common data model for 3D cities, which defines the geometry, semantics, topology, information on the appearance and other properties of most solid objects in the city, standardizes the multi-scale model division criteria, and provides Application Domain Extension (ADE) to meet the application requirements of other domains. Therefore, it is important to apply City GML in architectural heritage to build a geometric, semantic, and topologically integrated 3D model of ancient buildings to realize digital conservation and fine management of ancient building models. This paper focuses on the Ming and Qing dynasty ancient buildings and constructs City GML extension models taking into account the semantics and topology through the application field extension mechanism to realize the integration of City GML with the field of architectural heritage conservation.
