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In recent years, 3D virtual indoor/outdoor urban modelling becomes a key spatial information framework for many civil andengineering applications such as evacuation planning, emergency and facility management. For accomplishing such sophisticatedecision tasks, there is a large demands for building multi-scale and multi-sourced 3D urban models. Currently, Building InformationModel (BIM) and Geographical Information Systems (GIS) are broadly used as the modelling sources. However, data sharing andexchanging information between two modelling domains is still a huge challenge; while the syntactic or semantic approaches do notfully provide exchanging of rich semantic and geometric information of BIM into GIS or vice-versa. This paper proposes a novelapproach for integrating BIM and GIS using semantic web technologies and Resources Description Framework (RDF) graphs. Thenovelty of the proposed solution comes from the benefits of integrating BIM and GIS technologies into one unified model, so-calledIntegrated Geospatial Information Model (IGIM). The proposed approach consists of three main modules: BIM-RDF and GIS-RDFgraphs construction, integrating of two RDF graphs, and query of information through IGIM-RDF graph using SPARQL. The IGIMgenerates queries from both the BIM and GIS RDF graphs resulting a semantically integrated model with entities representing bothBIM classes and GIS feature objects with respect to the target-client application. The linkage between BIM-RDF and GIS-RDF isachieved through SPARQL endpoints and defined by a query using set of datasets and entity classes with complementary properties,relationships and geometries. To validate the proposed approach and its performance, a case study was also tested using IGIMsystem design

BIM-GIS INTEGRATED GEOSPATIAL INFORMATION MODEL USING SEMANTIC WEB AND RDF GRAPHS