A subset of CityGML has been successfully implemented and evaluated in the project “Pilot 3D” of the GDI
NRW in 2005. Participants came from all over Germany and demonstrated city planning scenarios and tourist
applications. Today, the official 3D city model of Berlin is based on the CityGML data model and employs
CityGML as the exchange format between database, editor, and presentation systems. Also the 3D city models of
Stuttgart, Bochum, Essen, Dortmund, Cologne, and Bonn are based on the CityGML model.