Smart City Gnosys

Smart city article details

Title	Digital Twin Smart City: Integrating Ifc And Citygml With Semantic Graph For Advanced 3D City Model Visualization
ID_Doc	20233
Authors	Lam P.-D.; Gu B.-H.; Lam H.-K.; Ok S.-Y.; Lee S.-H.
Year	2024
Published	Sensors, 24, 12
DOI	http://dx.doi.org/10.3390/s24123761
Abstract	The growing interest in building data management, especially the building information model (BIM), has significantly influenced urban management, materials supply chain analysis, documentation, and storage. However, the integration of BIM into 3D GIS tools is becoming more common, showing progress beyond the traditional problem. To address this, this study proposes data transformation methods involving mapping between three domains: industry foundation classes (IFC), city geometry markup language (CityGML), and web ontology framework (OWL)/resource description framework (RDF). Initially, IFC data are converted to CityGML format using the feature manipulation engine (FME) at CityGML standard’s levels of detail 4 (LOD4) to enhance BIM data interoperability. Subsequently, CityGML is converted to the OWL/RDF diagram format to validate the proposed BIM conversion process. To ensure integration between BIM and GIS, geometric data and information are visualized through Cesium Ion web services and Unreal Engine. Additionally, an RDF graph is applied to analyze the association between the semantic mapping of the CityGML standard, with Neo4j (a graph database management system) utilized for visualization. The study’s results demonstrate that the proposed data transformation methods significantly improve the interoperability and visualization of 3D city models, facilitating better urban management and planning. © 2024 by the authors.
Author Keywords	3D visualization; building information model (BIM); CityGML; digital twin; industry foundation classes (IFC); smart city

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