Request for Comment on CityGML Standard

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 specification Revision 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, Inc. (OGC) is requesting public comment on the candidate CityGML Encoding Standard. CityGML is a Geography Markup Language 3 (GML3) application schema for the storage and exchange of virtual 3D city models.

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. These thematic information go beyond graphic exchange formats and allow to employ virtual 3D city models for sophisticated analysis tasks in different application domains like simulations, urban data mining, facility management, and thematic inquiries.

Activities that would benefit from the richness of CityGML data include city planning, real estate, insurance, architectural design, environmental simulation, mobile telecommunication, disaster management, homeland security, facilities management, vehicle and pedestrian navigation, training simulators and others. CityGML will play an important role in the use of Building Information Models (BIM) to improve interoperability among the information systems used in the many domains of activity that involve design, construction, ownership and operation of buildings and capital projects.

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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