The significance of 3D city modeling and its promising applications in the fields of city planning, cadastral mapping, urban simulations, etc. are progressively increasing. One of the major problems being faced in the applications of 3D city modeling is the lack of Interoperability between different BIM (Building Information Modeling) and GIS (Geographical Information Systems) 3D data models. IFC (Industry Foundation Classes) and CityGML (City Geographic Markup Language) are considered as the most prominent 3D data models in the BIM and GIS industry. Considerable problems arises while transforming data from one data model to another including loss of information, inappropriate transformation, loss of topology and relationships, etc. IFC and CityGML differ widely in terms of geometrical and semantic model of information. Semantic heterogeneity presents a major challenge when the focus is on interoperability, which makes it difficult to acquire a direct matching of different entities between the two domains. In this paper, we propose a semantic model of interoperability for IFC and CityGML based on reference ontologies for the transformation of building models’ information between the two data models. UML (Unified Modeling Language) has been selected for building the conceptual model of transformative mapping, owing to its widespread acknowledgement. The purpose is to describe an efficient schema mapping process encapsulating both, the IFC and CItyGML data models, thus avoiding loss of information arising from transformation of Solid based geometry (IFC) to Surface based representations (CityGML). The intention is to reconstruct the entities with maximum level of details.
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