Abstract
Abstract. Geographic information and building information modelling both model buildings and infrastructure, but the way in which they are modelled is usually complimentary and BIM-GIS integration is widely considered as a way forward for both domains. For one, more detailed BIM data can feed more general GIS data and GIS data can provide the context that is necessary to BIM data. While previous studies have focused on the theoretical aspects of such an integration at a schema level, in this paper we focus on explaining the geometric and topological issues we have found while trying to develop software to realise such an integration in practice and at a data level. In our preliminary results, which are presented here, we have found that many issues for such an integration remain: handling the geometric and topological problems in BIM models, dealing with bad georeferencing and figuring out the best way to convert data between IFC and CityGML are all open issues.
Highlights
The geographic information science (GIS) domain describes information about the environment, mainly as it currently exists, while the building information modelling (BIM) domain focuses on information about the design and construction of building sites
Industry Foundation Classes (IFC) models represent the physical elements of single constructions in great detail, and CityGML models represent entire cities in a simpler format that is usable for exchange, dissemination and spatial analyses, such as solar potential and energy consumption estimations
BIM and GIS have a common interest in modelling certain object types, they fundamentally differ in their encoding, their use of geometry and semantics, as well as their level of detail
Summary
The geographic information science (GIS) domain describes information about the environment, mainly as it currently exists, while the building information modelling (BIM) domain focuses on information about the design and construction of building sites. The partners in the project are: GIS/CityGML experts from TU Delft, BIM/IFC experts from TU Eindhoven, Geonovum as the Dutch national organisation for GIS data standardisation, BIMloket as the Dutch national organisation for BIM standardisation, and several users: the Cities of Rotterdam and The Hague as well as Rijkswaterstaat, the Dutch government entity responsible for public works and water management The project is an experiment- and use case-driven scoping study and has two aims: (1) to develop a CityGML/IFC interface for reusing GIS data in the BIM domain and vice versa and (2) to formulate recommendations for further integration, such as modelling guidelines for bidirectional integration based on the main issues identified and the preferred solutions to these. This paper presents the intermediate results of the project which provided already some detailed insights into the issues of integrating GIS and BIM data in practice
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