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CityGML Version 2.0 adopted

Date 2012.04.24

The Open Geospatial Consortium (OGC) has approved the new City Geography Markup Language (CityGML) Encoding Standard Version 2.0.

CityGML is an XML-based open data format for the consistent description and modelling of 3D city and regional models allowing interoperable 3D data exchange via OGC Web Services. Moreover, CityGML represents not only the geometry of an object, but also the topology, semantics and appearance of it. Among others, the Digital Terrain Model (DTM), buildings, transport, street furniture, vegetation, waters, and other features can be modelled as objects. CityGML defines a multi-scale model with five accuracy degrees (Levels of detail) (LODO-4) building upon one another.

CityGML is already being used in Germany in a lot of applicational fields of business and administration, for instance environmental simulations, energy needs assessment, urban facility management, real-estate valuation, urban recycling economy, disaster management, robotics, and Location Based Marketing. Further, CityGMl is also used on the international level within the frame of National Spatial Data Infrastructures for the purpose of converting existing 2D data into 3D data, as e.g. in the Netherlands, France, Malaysia, and Abu Dhabi.

Version 2.0 defines as compared with version 1.0 additional object types (feature types) such as bridges and tunnels as well as new properties of existing objects (feature properties), for example the relative location of the object with respect to the surrounding terrain. Moreover, it is now possible to model also roof projections in addition to floor plans in order to enable creation of 3D models from existing 2D models. Furthermore, usage of generic attributes was extended. Given that all elements of CityGML Version 1.0 are retained, existing Version 1.0 CityGLM datasets can easily be converted into the new Version 2.0 by a modification of the Namespaces. A CityGLM 2.0 test dataset with all new structures can be found on the homepage www.citygml.org.

CityGLM was originally defined by the Special Interest Group 3D (SIG3D) of the GeoData Infrastructure Germany (GDI-DE) and as a standard successfully submitted to the OGC. The SIG3D has also substantially cooperated in the definition and development of the current CityGLM Version.

Contact:

Spokesperson SIG3D, Dr. Egbert Casper (Zerna Ingenieure GmBH), cas@zerna.eu

Further information:

http://www.opengeospatial.org/standards/citygml

http://www.sig3d.org

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