The OGC seeks comment on City Geography Markup Language (CityGML) V1.1

Please note: This Request is closed. The documents listed below have been adopted by the OGC Technical and Planning Committee. These specifications are under control of the Standards Working Group and will be released after the edits and revisions. For the most current version please check our Standards Page.

The Open Geospatial Consortium (OGC®) seeks public comment on Version 1.1 of the OGC City Geography Markup Language (CityGML) Encoding Standard (

CityGML is an open information model and XML-based encoding for the representation, storage, and exchange of virtual 3D city models. It provides a way to describe objects with respect to their geometry, topology, semantics and appearance, and it defines five different levels of detail. CityGML allows users to employ virtual 3D city models for sophisticated analysis and display tasks in different application domains such as pedestrian navigation, environmental simulations, urban data mining, facilities management, real estate appraisal, and location based marketing.

CityGML has been implemented in many software solutions and is in use in many projects around the world. Developed for Urban Information Modeling applications, CityGML plays an important role in bridging Urban Information Models with Building Information Models (BIM) to improve interoperability among the information systems used in the many areas of activity that involve design, construction, ownership and operation of buildings and capital projects.

CityGML is implemented as an application schema of the OGC Geography Markup Language 3 (GML3) Encoding Standard (, an international standard for spatial data exchange and encoding approved by the OGC and the International Organization for Standardization (ISO).

The current version 1.0 of CityGML was adopted as an official OGC Standard in August 2008 and has come to wide use since then. The OGC Technical Committee's CityGML Working Group has received input from the wider community in the form of change requests, proposed additions and suggestions. With this guidance, the Working Group developed the draft CityGML Version 1.1, a minor revision of the current CityGML version 1.0 that maintains backwards compatibility with version 1.0. Version 1.1 includes new thematic modules for tunnels and bridges, the ability to model footprint and roof edge representations for buildings in the coarsest level of detail, and generic attribute sets, as well as a number of additional properties and other enhancements.

 The candidate CityGML Version 1.1 standard documents are available for review and comment below. Comments are due by 14 September 2011.


Comments can be submitted to a dedicated email reflector for a thirty day period ending on the "Close request date" listed above, Comments received will be consolidated and reviewed by OGC members for incorporation into the document. Please submit your comments using the following link: requests [at] (Click here to submit comments) The link provided above should include a standard template in the message body. If the preloaded message body does not work properly using your mail client, please refer to the following template for the message body: Comments Template


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