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Open AccessArticle

Achieving Complete and Near-Lossless Conversion from IFC to CityGML

Department of Architecture, School of Design and Environment, National University of Singapore, Singapore 117566, Singapore
Author to whom correspondence should be addressed.
All authors contributed equally to this work.
Tauscher, H.; Stouffs, R. An IFC-to-CityGML triple graph grammar. In Computing for a better tomorrow: Proceedings of the 36th eCAADe conference; Lodz, Poland, September 2018.
ISPRS Int. J. Geo-Inf. 2018, 7(9), 355;
Received: 31 May 2018 / Revised: 8 August 2018 / Accepted: 20 August 2018 / Published: 27 August 2018
PDF [1255 KB, uploaded 27 August 2018]


The Singapore Government has embarked on a project to establish a three-dimensional city model and collaborative data platform for Singapore. The research herein contributes to this endeavour by developing a methodology and algorithms to automate the conversion of Building Information Models (BIM), in the Industry Foundation Classes (IFC) data format, into CityGML building models, capturing both geometric and semantic information as available in the BIM models, and including exterior as well as interior structures. We adopt a Triple Graph Grammar (TGG) to formally relate IFC and CityGML, both semantically and geometrically, and to transform a building information model, expressed as an IFC object graph, into a city model expressed as a CityGML object graph. The work pipeline includes extending the CityGML data model with an Application Domain Extension (ADE), which allows capturing information from IFC that is relevant in the geospatial context but at the same time not supported by CityGML in its standard form. In this paper, we elaborate on the triple graph grammar approach and the motivation and roadmap for the development of the ADE. While a fully complete and lossless conversion may never be achieved, this paper suggests that both a TGG and an ADE are natural choices for supporting the conversion between IFC and CityGML. View Full-Text
Keywords: building model; BIM; IFC; CityGML; ADE; conversion; triple graph grammar building model; BIM; IFC; CityGML; ADE; conversion; triple graph grammar

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Stouffs, R.; Tauscher, H.; Biljecki, F. Achieving Complete and Near-Lossless Conversion from IFC to CityGML . ISPRS Int. J. Geo-Inf. 2018, 7, 355.

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