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On 19 August, the Open Geospatial Consortium endorsed CityGML 1.0 as an OGC standard.

The move follows the end of a 60-day period in which OGC members considered the intellectual property rights implications of the proposal. The period elapsed without dissent from any of the members, making the model an official standard. It is available for use free of charge.

CityGML is an 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, semantic and appearance properties.

It includes generalisation hierarchies between thematic classes, aggregations, relations between objects, and spatial properties. This makes it a step beyond graphic exchange formats, and would allow users to employ 3D city models for analysis tasks in simulation, urban data mining, facility management and thematic inquiries.

CityGML is based on an XML format, implemented as an application schema for the Geography Markup Language 3 (GML3). GML is a standard for spatial data exchange issued by the OGC and the ISO TC211.

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