CityGML
CityGMLis an open standardiseddata modeland exchange format to store digital3D models of citiesandlandscapes.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 standardlevels 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.
CityGML is implemented as aGML application schemafor theGeography Markup Language3 (GML3), the extendible international standard for spatial data exchange issued by theOpen Geospatial Consortium(OGC) and theISO TC211.
Implementations
[edit]In its most common implementation, which is the one generally used to disseminate and exchange data, CityGML datasets consist of a set ofXMLfiles and possibly some accompanying image files that are used as textures. Each text file can represent a part of the dataset, such as a specific region, a specific type of object (such as a set of roads), or a predefined LoD. The structure of a CityGML file is a hierarchy that ultimately reaches down to individual objects and their attributes. These objects have a geometry that is described using GML.
Another important implementation of CityGML is the one of 3D City DB, which stores CityGML in a database.[1]
Version history
[edit]The OGC Members adopted version 1.0.0 of CityGML as an official OGC Standard in August 2008.[2]In late 2011, the OGC Members approved version CityGML 2.0.0. CityGML 3.0GML Encoding Specificationis supposed to be published early 2019,[3]while CityGML 3.0Conceptual Modeldraft is already publicly available at theofficial Github repository.
See also
[edit]References
[edit]- ^"Home".3dcitydb.net.
- ^"OGC(R) Adopts CityGML Encoding Standard".OGC®.19 August 2008. Archived fromthe originalon 19 November 2008.Retrieved27 September2008.
- ^"Archived CityGML 3.0 Development Repo".GitHub.24 August 2021.
External links
[edit]- CityGML standard page from the Open Geospatial Consortium
- Official CityGML site
- CityGML Wiki
- Free Viewers/Tools for CityGML:
- Commercial Viewers/Tools for CityGML: