The Open Geospatial Consortium (OGC) and Special Interest Group (SIG) 3D recently signed a memorandum of understanding (MOU) to cooperate in standards development and promotion of standards for the exchange and visualization of 3D geospatial content using Web-based technologies. SIG 3D members defined the first version of CityGML and in 2005 submitted CityGML as a candidate
standard into the OGC standards process. CityGML is a comprehensive open data model framework and XML-based encoding standard for the storage and exchange of virtual 3D urban models and is now an OGC standard. It is an application schema of the OGC Geography Markup Language 3 (GML3) Encoding Standard. Learn More
