• A two page flyer about CityGML is available for download.
• We have included a new, specific mechanism to support the extension of CityGML by third parties, the so-called Application Domain Extensions (ADE). ADEs define domain specific extensions to CityGML by augmenting existing CityGML feature types with further spatial and non-spatial properties. Above, new feature types based on CityGML feature types can be derived. ADEs are specified with their own namespaces and using XML schema. This preserves the possibiliy for XML validation even of extended CityGML files.
• CityGML was extensively used and evaluated in the OGC Web Services Testbed No. 4 (OWS-4). Results of OWS-4 will be published on the OGC homepage and on this website soon.
• CityGML is employed in the implementation of the European Commission's Environmental Noise Directive within the state North-Rhine Westphalia in Germany. A Noise ADE has been developed, which can be downloaded below. Also some recent papers about the usage of CityGML for noise mapping are available here.
• We have now a logo for CityGML. Our special thanks go to the designer Maria Iqbal!
• Recent presentations of CityGML at Ordnance Survey (18th of January 2007), Southampton, and on the GITA / OGC Emerging Technologies Summit in Washington (21-23th of March 2007). The slides are available here.

• The OGC Technical Committee has approved the CityGML specification as an OGC Discussion Paper on their meeting in Edinburgh. The specification document (OGC 06-057r1, PDF 3.3 MB) can be freely downloaded from the discussion papers section of the Open Geospatial Consortium homepage. The XML schema files and test datasets can be found here. Within OGC, CityGML is discussed and further developed within the CAD/GIS Interoperability Working Group.

• CityGML has become a working item in the running OGC Web Services Testbed No. 4 (OWS-4). One of the working items is a synchronization / harmonization with the Industry Foundation Classes (IFC), an ISO standard for Building Information Models issued by the International Alliance for Interoperability (IAI). It is intended to jointly produce a specification that defines the mapping between CityGML and IFC.

• Comments and change requests can be entered in the future immediately on the upcoming CityGML pages on OGC Network.

• We are starting to collect and maintain a list of CityGML (also partial) implementations. If your commercial or Open Source product is capable of handling CityGML, please send us a short abstract of no more than 200 words and two hyperlinks: one directly pointing to the product, and possibly a second one pointing to the company or institution homepage.

• A new article on CityGML jointly penned by SIG 3D and OGC appeared in Directions Magazine.

• New test datasets and a new version of the Aristoteles viewer (incl. a rough WFS interface, texture editing & rectification capabilities) are available. All datasets are adapted to the latest CityGML XML schema.

• The CityGML Implementation Specification document has been finalised and was submitted to the Open Geospatial Consortium on 2nd of June, 2006. OGC members can download it from the pending documents list (OGC Doc. No. 06-057). CityGML will be discussed within the CAD/GIS Interoperability Working Group on the TC meeting in June 2006 in Edinburgh. If CityGML will be approved as an official Discussion Paper, it will become freely downloadable in July. However, the XML schema, UML diagrams, and test datasets can already be found here.

• The version number was changed from 1.0 beta down to 0.3.0 in order to synchronize with the version number of the OGC CityGML Implementation Specification proposal. The current version 0.3.0 reflects the state of CityGML that has been prepared by the SIG 3D under the internal version number 1.0 beta.

• Recent updates to CityGML 0.3.0 (important for implementors):

• The CityGML namespace was changed to the URL http://www.citygml.org/citygml/1/0/0
• At many places in the XML schema the surface geometries from thematic feature types were changed from gml:_Surface to gml:MultiSurface in order to allow for the representation of unconnected surface patches.
• Addresses now are represented as features. Address details have to be specified using the Extendible Address Language xAL 2.0 from the OASIS consortium.
• Most thematic features (subclasses of _CityObject) now have the attributes class, function, and usage. Class can be used for nearer classification, function denotes the object's purpose(s) and usage its possible and actual usages.
• Implicit geometries (using prototypical shapes) can now be used by thematic features of the types BuildingFurniture, SolitaryVegetationObject, CityFurniture, and GenericCityObject.
• The suffixes '...Property' and '...Geometry' were removed from the names of the corresponding property elements.
• Surfaces can now have more than one material / texture per side.
• For most of the enumerative attributes corresponding external code lists have been specified (see file CityGML_ExternalCodeLists.xml in the CityGML schema archive below). These values should be regarded as a suggestion of the SIG 3D. They may be completely redefined by other information communities or in other countries.

• A first version of the CityGML specification document has been distributed to the members of EuroSDR in order to gather comments and corrections for the OGC proposal submission.

• CityGML 1.0 has been finished! The beta version of the UML diagrams and XML schemas can be downloaded.

• CityGML is used in conjunction with a transactional Web Feature Service (WFS-T) for the administration, continuation and usage of the official virtual 3D city model of Berlin. The components are currently being adapted for the 3D city model of Bonn.

• British Ordnance Survey has joined the modeling working group in summer 2005

• Starting in January 2006, the application and adaption of CityGML in the European Community is investigated and promoted in an EuroSDR project (European Spatial Data Research, formerly known as OEEPE)

Created and maintained by Thomas H. Kolbe
Last update: 2008-06-24