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CityGML Standard – 3D Urban Data Model & Exchange Format
Explore the CityGML standard, an open 3D city model data model and exchange format for representing terrain, buildings, infrastructure, vegetation, topology, and semantics., The CityGML standard defines an open 3D city model conceptual model and exchange format for storing and sharing virtual representations of terrain, buildings, infrastructure, and urban objects.
ogc.org →This standard defines a conceptual model and exchange format for the representation, storage and exchange of virtual 3D city models. (Hover over Type for full description) Document title Version OGC Doc No. Type OGC City Geography Markup Language (CityGML) Part 2: GML Encoding Standard 3.0 21-006r2 IS OGC City Geography Markup Language (CityGML) Part 1: Conceptual Model Standard 3.0 20-010 IS OGC City Geography Markup Language (CityGML) 3.0 Conceptual Model Users Guide 3.0 20-066 UG OGC City Geography Markup Language (CityGML) Encoding Standard 2.0 12-019 IS OpenGIS® City Geography Markup Language (CityGML) Encoding Standard 1.0 08-007r1 IS Example datasets for the CityGML 3.0 GML Encoding for education, software development, and testing purposes. The CityGML standard defines a conceptual model and exchange format for the representation, storage and exchange of virtual 3D city models. It facilitates the integration of urban geodata for a variety of applications for Smart Cities and Urban Digital Twins, including urban and landscape planning; Building Information Modeling (BIM); mobile telecommunication; disaster management; 3D cadastre; tourism; vehicle & pedestrian navigation; autonomous driving and driving assistance; facility management, and; energy, traffic and environmental simulations. CityGML 3.0 allows data to be encoded in GML/XML, but also in JSON or database schemas. Additional benefits compared to previous versions include much better integration with BIM, the ability to represent indoor spaces in different Levels of Detail (LOD), support for dynamic data provided by sensors and simulations, and the capability to extend the information model into Application Domain Extensions using Model Driven Architecture tools. A GML encoding for CityGML 3.0 is available for practical use. The respective XML schema files can be downloaded from here: As many datasets using both CityGML 1.0 and 2.0 have been created and are in active use, these specifications will not be deprecated. However, existing data can be upgraded to CityGML 3.0. Members of the public can review draft standards and share feedback to ensure they are practical and widely applicable. OGC Seeks Public Comment on Proposed 3D Tiles 2.0 Community Standard Work Item The Open Geospatial Consortium (OGC) Federated Maritime Spatial Data Infrastructure (FMSDI) Pilot is... Earlier in this series, I introduced four common challenges that I frequently encounter... Artificial Intelligence (AI) is reshaping how we understand our world. From disaster response...
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CityGML is an open standardised data model and exchange format to store digital 3D models of cities and landscapes. It defines ways to describe most of the common 3D features and objects found in cities (such as buildings, roads, rivers, bridges, vegetation and city furniture) and the relationships between them. It also defines different standard levels of detail (LoDs) for the 3D objects, which allows the representation of objects for different applications and purposes, such as simulations, urban data mining, facility management, and thematic inquiries.
Excerpted from Wikipedia’s “CityGML” article, available under the CC BY-SA 4.0 licence.