| What is CityGML |
| Features |
| Background |
Features
CityGML does not only represents the graphical appearance of city models but especially takes care of the representation of the semantic resp. thematic properties, taxonomies and aggregations of Digital Terrain Models, sites (including buildings, bridges, tunnels), vegetation, water bodies, transportation facilities, and city furniture. The underlying model differentiates five consecutive levels of detail (LOD), where objects become more detailed with increasing LOD regarding both geometry and thematic differentiation. CityGML files can - but don't have to - contain multiple representations for each object in different LOD simultaneously.
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Portion of a CityGML model of Berlin with buildings in Levels-of-Detail 1, 2, and 3 (click to enlarge). | Simple model of the city Königswinter including LOD 1 buildings, terrain, and streets (click to enlarge). | Four buildings in LOD 3, automatically generated from IFC building objects. Please note the coherent semantic and geometric decomposition (click to enlarge). |
A more detailed description of the features and modeling principles of CityGML will be added to this homepage in the near future. In the meantime you can retrieve more information from the online resources.
Created and maintained by Thomas H. Kolbe
Last update: 2007-05-28