Abstract
Abstract. The integration of Geographic Information System (GIS) and the Building Information Modeling (BIM) referred to as the merging of the two systems for the purpose of data interoperability. The need to share information between the two systems is what motivated the integration process purposely for geospatial analysis. This can be achieved through their data exchange formats such as; City Markup Language (CityGML) and Industry Foundation Classes (IFC). The formats are the two most prominent key schemas of GIS and BIM systems respectively. The integration is a step towards information exchange or sharing (data interoperability) between the two systems. The selection of the two most prominent data exchange formats is as a result of their widespread applications in the GIS and BIM domains. However, the differences in geometric and the semantics information hinders data interoperability (information sharing) between GIS and BIM. Also, coupled with the difference in schema structure and the level of information richness between IFC and CityGML. This paper, propose a geometry transformation process that can be used to extract and transform IFC building objects to that of CityGML building objects to enable 3D model design and constructed using BIM tool to be easily reused in 3D GIS applications which will be able to support the CityGML model format. Where the geometric information will be extracted using the IFC tree-structure (hierarchy) and transformed to destination CityGML.
Highlights
The world is currently looking at the possibilities of creating a more controllable, collaborative, seamless and visually realistic information management environment for Geographic Information System (GIS) and building industry
The LoDs are define as follows; LoD0 is a footprint on 2D of the building model, LoD1 is an extrusion of the building footprint in form of a block in 3D with flat roof, while LoD2 is block model which has differentiated and CityGML building models represents building in 5 LODs but still, CityGML is less complete and mature as in Building Information Modeling (BIM), even in LoD4 being the highest LODs for both models
We propose a transformation process that can be used to extract and transform Industry Foundation Classes (IFC) building objects to that of CityGML building objects to enable 3D models design and constructed using BIM tools to be reused in 3D GIS applications which will be able to support the CityGML model format
Summary
The world is currently looking at the possibilities of creating a more controllable, collaborative, seamless and visually realistic information management environment for Geographic Information System (GIS) and building industry. The 3D building objects developed by the BIM systems and the geodata objects created and managed in the GIS systems are quite different in their representation approaches and data storage formats, their data integration still presents a challenging task. These challenges include the following; the difference in reference systems between BIM and GIS, Loss of semantics information, Geometric representation of 3D objects in BIM and GIS and harmonization of the LoDs. In this paper we tend to focus on the geometric data extraction and transformation for the GIS and BIM integration.
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