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**Left**: CityGML 2.0 Modules ([Overview](https://docs.opengeospatial.org/guides/20-066.html)) **Right**: CityGML 3.0 Modules ([Overview](https://portal.ogc.org/files/?artifact_id=47842))
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</div>
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The following example shows a CityModel (CityGML 2.0) that makes use of several modules including Building, Bridge, WaterBody, Vegetation, Relief, and Transportation. ![Bildbeschreibung](uploads/5f7b4ff3ea8229a7daa9561c753425a7/3D_DLM_Stoeckach.png "Kap-LoD-1-Gebäudehöhen-ALKIS3D")
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The following example shows a CityModel (CityGML 2.0) that makes use of several modules including Building, Bridge, WaterBody, Vegetation, Relief, and Transportation.
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![Bildbeschreibung](uploads/5f7b4ff3ea8229a7daa9561c753425a7/3D_DLM_Stoeckach.png "Kap-LoD-1-Gebäudehöhen-ALKIS3D")
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<div align="center">
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**CityGML Model Stuttgart-Stöckach**
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</div>
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</dl>The CityGML model Stuttgart-Stöckach was created by L. Rothengass as a part of his Master Thesis at HFT Stuttgart using the software [3dfier](https://github.com/tudelft3d/3dfier) and data provided by the State Office for Spatial Information and Land Development (LGL BW) (base DLM and LiDAR data) and the City of Stuttgart (tree cadastre and LOD2 building module).
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</div>
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The CityGML model Stuttgart-Stöckach was created by L. Rothengass as a part of his Master Thesis at HFT Stuttgart using the software [3dfier](https://github.com/tudelft3d/3dfier) and data provided by the State Office for Spatial Information and Land Development (LGL BW) (base DLM and LiDAR data) and the City of Stuttgart (tree cadastre and LOD2 building module).
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## CityGML Core
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In CityGML 3.0, only the UML model is defined in the conceptual model standard document. Unlike CityGML 2.0 multiple encodings can exist for CityGML 3.0 to encode the conceptual (UML) model. One encoding is the [XML](https://github.com/opengeospatial/CityGML-3.0Encodings/tree/master/Moved_to_CITYGML-3.0Encoding_CityGML) encoding. A free java tool to convert datasets from CityGML 2.0 to CityGML 3.0 is available [here](https://github.com/tum-gis/citygml2-to-citygml3). Other encodings such as CityDotNet, CityJSON, CitySQL are under [development](https://github.com/opengeospatial/CityGML-3.0Encodings).
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<div align="left">
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<div>
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**Previous Chapter** [Home Page](https://transfer.hft-stuttgart.de/gitlab/coors/3d-stadtmodelle/-/wikis/home)
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**Next Chapter** [chapter 2: Building](https://transfer.hft-stuttgart.de/gitlab/coors/3d-stadtmodelle/-/wikis/EN/CityGML-Tutorial/chapter%202:%20Building)
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</div>
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<div align="right">
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<div>
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**Next Chapter** [chapter 2: Building](https://transfer.hft-stuttgart.de/gitlab/coors/3d-stadtmodelle/-/wikis/EN/CityGML-Tutorial/chapter%202:%20Building)
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**Previous Chapter** [Home Page](https://transfer.hft-stuttgart.de/gitlab/coors/3d-stadtmodelle/-/wikis/home)
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</div>
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## References:
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[OGC CityGML standard](https://www.ogc.org/standards/citygml)
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### CityGML Version 3.0
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[^1]: [OGC City Geography Markup Language (CityGML) 3.0 Conceptual Model Users Guide, OGC document 20-066](http://www.opengis.net/doc/UG/CityGML-user-guide/3.0)
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[OGC City Geography Markup Language (CityGML) Part 1: Conceptual Model Standard, OGC document 20-010](https://docs.ogc.org/is/20-010/20-010.html)
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[Kutzner, T., Chaturvedi, K. & Kolbe, T.H. CityGML 3.0: New Functions Open Up New Applications. PFG 88, 43–61 (2020). https://doi.org/10.1007/s41064-020-00095-z](https://doi.org/10.1007/s41064-020-00095-z)
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[^1]: [OGC City Geography Markup Language (CityGML) 3.0 Conceptual Model Users Guide, OGC document 20-066](http://www.opengis.net/doc/UG/CityGML-user-guide/3.0) |
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