Geospatial Consortium (OGC®) seeks public comment on Version 1.1 of
the OGC City Geography Markup Language (CityGML) Encoding Standard
CityGML is an
open information model and XML-based encoding for the representation,
storage, and exchange of virtual 3D city models. It provides a way to
describe objects with respect to their geometry, topology, semantics
and appearance, and it defines five different levels of detail.
CityGML allows users to employ virtual 3D city models for
sophisticated analysis and display tasks in different application
domains such as pedestrian navigation, environmental simulations,
urban data mining, facilities management, real estate appraisal, and
location based marketing.
CityGML has been
implemented in many software solutions and is in use in many projects
around the world. Developed for Urban Information Modeling
applications, CityGML plays an important role in bridging Urban
Information Models with Building Information Models (BIM) to improve
interoperability among the information systems used in the many areas
of activity that involve design, construction, ownership and
operation of buildings and capital projects.
implemented as an application schema of the OGC Geography Markup
Language 3 (GML3) Encoding Standard
an international standard for spatial data exchange and encoding
approved by the OGC and the International Organization for
version 1.0 of CityGML was adopted as an official OGC Standard in
August 2008 and has come to wide use since then. The OGC Technical
Committee's CityGML Working Group has received input from the wider
community in the form of change requests, proposed additions and
suggestions. With this guidance, the Working Group developed the
draft CityGML Version 1.1, a minor revision of the current CityGML
version 1.0 that maintains backwards compatibility with version 1.0.
Version 1.1 includes new thematic modules for tunnels and bridges,
the ability to model footprint and roof edge representations for
buildings in the coarsest level of detail, and generic attribute
sets, as well as a number of additional properties and other
The candidate CityGML Version 1.1
standard documents are available for review and comment below.
Comments are due by 14 September 2011.