This Call for Participation seeks organizations
and individuals to participate in the development of the next major version of
the OGC City Geography Markup Language (CityGML).
CityGML is a comprehensive open data model
framework and XML-based encoding standard for the modeling, storage, and
exchange of virtual 3D city and landscape models. Since 2008, it is an
international OGC standard. CityGML is implemented as an application schema of
the OGC Geography Markup Language 3 (GML3) Encoding Standard
(http://www.opengeospatial.org/standards/gml), an international standard for
spatial data exchange and encoding approved by the OGC and ISO. CityGML is
being implemented across Europe, Canada, the Middle East and Asia. It has even
been adopted by several countries including The Netherlands and Germany as
official national and municipal 3D geo information standard, and it has been
adapted as part of the European Union's common spatial data infrastructure
Since the release of CityGML 2.0, a number of
CityGML change requests have been submitted to the OGC. In June 2013, further
requirements and ideas guiding the development of CityGML 3.0 were gathered and
discussed at an international workshop jointly hosted by the OGC and the
Special Interest Group 3D (SIG 3D). All presentation slides and the minutes of
the workshop are available here: http://en.wiki.modeling.sig3d.de/index.php/Workshop_Munich_2013 . The outcomes of this ongoing
discussion are formally captured in a list of work packages that define the
overall work scope for CityGML 3.0. Examples of the identified work include
changes to CityGML’s level-of-detail concept, additional semantic model
structures such as building storeys, floor plans or utility networks, as well
as new complex attributes like time series and metadata. To the extent
feasible, new features will minimize impacts on backwards compatibility that
might affect the many communities using the current version of CityGML.
The OGC solicits input and expertise from CityGML
users, data producers, software vendors, and scientists in order to identify
participants willing to contribute to and able to assume ownership for the work
of the work packages under the joint leadership of the OGC CityGML Standard
Working Group (SWG) and the SIG 3D. This call explicitly includes non-OGC
members. Active participation in the CityGML 3.0 development process does not require
OGC membership. To be most effective, organizations and individuals responding
to this CFP should plan to fully participate in the CityGML 3.0 development
3.0 work packages are as follows:
and maintain the UML representations of the conceptual model(s).
and implement the standards document(s).
the level-of-detail (LoD) concept.
root-level inheritance from GML and separation of conceptual model and
a method to keep CityGML synchronized with changing GML versions.
a representation for changing content of entire models or parts of a model.
This includes time-sequences of successive representations, simultaneously
existing alternate versions, mobile objects, and dynamic objects.
a materials module and/or revise the textured surfaces module.
a representation for land administration.
a representation for non-building building-like structures.
a representation for utility networks.
a representation for volumetric construction and work toward harmonization with
the Industry Foundation Classes (IFC).
representation for metadata, complex attributes, and harmonize with INSPIRE.
a representation for storeys (Am. “stories”) and other new semantic constructs.
or a mechanism for parameterized implicit geometries.
The work package list is publically available on
GitHub at https://github.com/opengeospatial/CityGML-3.0/wiki. Interested
parties are encouraged to register at the Wiki page of the work package(s) to
which they wish to contribute by adding their
- Email address; and
- Intended role (e.g., work package
lead, editor, co-editor, contributor, reviewer)
to the list of
Registration only requires a GitHub user account
which can be obtained free of charge at https://github.com/join. The CityGML
SWG intends to use GitHub as open platform for the management of work packages,
discussion and issues, informative content, and publication of work results throughout
the entire CityGML 3.0 development process. CityGML users are invited to use
the GitHub platform to communicate existing or anticipated uses cases for
CityGML to be considered in the development. If you are not familiar with
GitHub, please contact the CityGML SWG Chairs who will assist you in
Responses to the CFP are requested by the time
of the 10 June 2014 kickoff of CityGML 3.0 development at the OGC Technical
Committee meeting in Geneva, Switzerland. Note, however, that this CFP will
remain open for the duration of the CityGML 3.0 development process.
About the SIG 3D
The SIG 3D is a special
interest group of the German National Spatial Data Infrastructure (GDI-DE). The
SIG 3D developed the first version of CityGML and in 2005 submitted CityGML as
a candidate standard to the OGC. Subsequent versions of CityGML were jointly
developed by OGC and SIG 3D based on a MoU between both organizations. The
members of SIG 3D come from all over Germany and the bordering European
countries. New members from anywhere in Europe are welcome.
About the OGC
The OGC is an international consortium of more
than 480 companies, government agencies, research organizations and universities
participating in a consensus process to develop publicly available geospatial
standards. OGC standards support interoperable solutions that
"geo-enable" the Web, mainstream IT, and wireless and location-based
services. OGC standards empower technology developers to make geospatial
information and services accessible and useful with any application that needs
to be geospatially enabled.