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 is an evolution of the previous versions 1.0 and 2.0 of CityGML. While the previous versions standardised a GML exchange format, CityGML 3.0 standardises the underlying information model, and can be implemented in a variety of technologies including GML. The CityGML 3.0 Conceptual Model Standard describes a common semantic information model for the representation of 3D urban objects. The primary function of the model is to define the human interpretation of modelled data objects as well as their geometric representation and relationships. As such the CityGML 3.0 Conceptual Model provides a framework for integrating, storing, and exchanging 3D geospatial data. 

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:
A CityGML 3.0 GML Encoding specification document is under development and will be issued as a separate encoding standard in due course.  

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.


(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

Related links

CityGML datasets (and 3D city models in further representations and data formats):

Awesome CityGML – List of international Open Data 3D city models

Cities/regions around the world with open datasets

Example datasets for the CityGML 3.0 GML Encoding for education, software development, and testing purposes.

Note, that these files can still change until the official release of the CityGML 3.0 GML Encoding specification (they have been stable now since 2020, though)

Open Data Initiatives

Open-Source CityGML 3D Semantical Building Models in 2020

Test datasets in all Levels-of-Detail

OGC managed list of implementations for CityGML

CityGML Wiki with lists of commercial software, freeware, and Open Source software and tools

OGC Community Standard CityJSON 1.0, a JSON-based encoding for CityGML 2.0

CityGML Modeling Guide

Provided by the SIG 3D of the German National Spatial Data Infrastructure GDI-DE) with recommendations on object structuring, geometry validation procedures, and data acquisition rules



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