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Indoor Spatial Data Infrastructure (indoor-SDI) is an important SDI for geosptial analysis and location-based services. Building\udInformation Model (BIM) has high degree of details in geometric and semantic information for building. This study proposed direct\udconversion schemes to extract indoor building information from BIM to OGC IndoorGML. The major steps of the research include (1)\udtopological conversion from building model into indoor network model; and (2) generation of IndoorGML. The topological conversion\udis a major process of generating and mapping nodes and edges from IFC to indoorGML. Node represents every space (e.g. IfcSpace)\udand objects (e.g. IfcDoor) in the building while edge shows the relationships between nodes. According to the definition of IndoorGML,\udthe topological model in the dual space is also represented as a set of nodes and edges. These definitions of IndoorGML are the same\udas in the indoor network. Therefore, we can extract the necessary data in the indoor network and easily convert them into IndoorGML\udbased on IndoorGML Schema. The experiment utilized a real BIM model to examine the proposed method. The experimental results\udindicated that the 3D indoor model (i.e. IndoorGML model) can be automatically imported from IFC model by the proposed procedure.\udIn addition, the geometric and attribute of building elements are completely and correctly converted from BIM to indoor-SDI

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

THE EXTRACTION OF INDOOR BUILDING INFORMATION FROM BIM TO OGC INDOORGML