Citygml Wiki

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Please, be aware of ...

Due to different reasons we have replace the hardware and updated the software of the CityGML Wiki. In the old version we had a huge number of users which were no longer active. As it was impossible to go through all the users, we decided to remove all users. We kindly ask serious users to apply for a new account (Karl-Heinz Häfele) and apologize any inconveniences.

CityGML - City Geography Markup Language

The City Geography Markup Language (CityGML) is a concept for the modelling and exchange of 3D city and landscape models that is quickly being adopted on an international level. CityGML is a common information model for the representation of 3D urban objects. It defines the classes and relations for the most relevant topographic objects in cities and regional models with respect to their geometrical, topological, semantical and appearance properties. Included are generalization hierarchies between thematic classes, aggregations, relations between objects, and spatial properties. In contrast to other 3D vector formats, CityGML is based on a rich, general purpose information model in addition to geometry and graphics content that allows to employ virtual 3D city models for sophisticated analysis tasks in different application domains like simulations, urban data mining, facility management, and thematic inquiries. Targeted application areas explicitly include urban and landscape planning; architectural design; tourist and leisure activities; 3D cadastres; environmental simulations; mobile telecommunications; disaster management; homeland security; vehicle and pedestrian navigation; training simulators; and mobile robotics.

CityGML is realised as an open data model and XML-based format for the storage and exchange of virtual 3D city models. It is implemented as an application schema for the Geography Markup Language version 3.1.1 (GML3), the extendible international standard for spatial data exchange issued by the Open Geospatial Consortium (OGC) and the ISO TC211. CityGML is an official OGC Standard and can be used free of charge.

The CityGMLWiki is an open portal to publish and share information about CityGML. However, it is not the official website of the CityGML. Please find the official website of CityGML at

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Welcome to CityGMLWiki!

CityGMLWiki is an open portal for all kind of information around CityGML. Good authors are always welcome – the first steps are very easy! Don't hesitate to login (please use a proper name) and add, correct, and modify the pages. All matters are subject to GNU Free Documentation Licence.

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As OGC is an international organisation and CityGML is an international development authors are kindly asked to contribute articles in English. However external references may include information and documents provided in different languages.

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Web Resources
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Wiki Access

If you want to share Information about CityGML in this Wiki, please contact Karl-Heinz Häfele for Login details

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Related Initiatives
IFC - Industry Foundation Classes - The IFC specification is a neutral data model to describe, exchange and share information typically used within the building and facility management industry sector. More Information can be found in the IFC Wiki.
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Suggestions can be send to Karl-Heinz Häfele
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