Current News on CityGML
- (24th of April 2012): CityGML 2.0.0 has been released! The final CityGML version 2.0.0 Standard document can be obtained from the CityGML section of the OGC web presence (direct document link). The CityGML XML Schema definition files can be found in the resources section and will also be published shortly by the OGC.
- A first publicly available CityGML 2.0.0 test dataset demonstrating nearly all feature types and properties of the new specification version is provided in the CityGML datasets download section. The dataset contains terrain, buildings, railways, tunnels, bridges, water bodies, vegetation, city furniture, generic city objects, and city object groups.
- (14th of March 2012): The members of the Open Geospatial Consortium, Inc. (OGC) have adopted version 2.0.0 of CityGML as an official OGC Standard. In the last 14 months the CityGML SWG has worked on the discussion and integration of all change requests that were submitted since the adoption of CityGML 1.0.0 in August 2008. Many thanks go to the members of the CityGML SWG, to the members of the SIG 3D, and to the whole CityGML community for the support and effort in making this happen.
Significant changes between CityGML version 2.0.0 and CityGML version 1.0.0 are:
- New thematic modules for the representation of tunnels and bridges;
- Additional boundary surfaces for the semantic classification of the outer shell of buildings and building parts (OuterCeilingSurface and OuterFloorSurface);
- LOD0 representation (footprint and roof egde representations) for buildings and building parts;
- Additional attributes denoting a city objectís location with respect to the surrounding terrain and water
surface (relativeToTerrain and relativeToWater);
- Additional generic attributes for measured values and attribute sets; and
- Redesign of the CityGML code list mechanism (enumerative attributes are now of type gml:CodeType
which facilitates to provide additional code lists enumerating their possible attribute values).
- (20th of February 2012): The OGC CityGML SWG decided to switch to version 2.0.0 instead of releasing the new version of the CityGML specification as version 1.1.0. The reason for this lies in a technical problem concerning the definition of 'backwards compatibility' as defined by OGC policies. While the changes to the CityGML code list mechanism do not practically affect the contents of existing CityGML 1.0.0 datasets, we were required to include changes in the XML schemas which in the end cannot fullfil the strict definition of the term 'backwards compatibility' in the OGC policies. In order to avoid a complete rework of the entire specification document and the schemas, the CityGML SWG decided to move to version 2.0.0 which resolves the technical problems. Please note that CityGML 1.0.0 files can easily be converted into V2.0.0 by a simple substitution of the namespace values (hence, version 2.0.0 can be considered backwards compatible in a practical sense).
- (4th of January 2012): The OGC is running a free web-based seminar about CityGML on the 12th of January 2012 at 5:00 pm UTC (12:00 noon EST). The seminar title is "How the OGCís CityGML Standard Supports 3D Innovation for Business and Government: Developments achieved in the Netherlands including use cases from the City of Rotterdam." Participation is free of charge; for registration details see the official press release.
- (15th of August 2011): The OGC seeks comments on CityGML 1.1. The CityGML working group at OGC has released the candidate specification of CityGML 1.1 for public comment (official OGC press release). CityGML 1.1 is a minor revision and maintains backwards compatibility with version 1.0. Included are, for example, new thematic modules for the representation of tunnels and bridges. The public is invited to review the candidate specification and to submit comments. The draft specification together with the XML schemas and example files can be obtained from www.opengeospatial.org/standards/requests/82. This page also provides details for the submission of comments. Comments are due by 14 September 2011.