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CityGML
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<h2 id="implementations">Implementations</h2> <p>In its most common implementation, which is the one generally used to disseminate and exchange data, CityGML datasets consist of a set of <a href="/facts/XML/clNgUfWk">XML</a> files 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. </p><p>Another important implementation of CityGML is the one of 3D City DB, which stores CityGML in a database.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> </p> <h2 id="version-history">Version history</h2> <p>The OGC Members adopted version 1.0.0 of CityGML as an official OGC Standard in August 2008.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> In late 2011, the OGC Members approved version CityGML 2.0.0. CityGML 3.0 <i>GML Encoding Specification</i> is supposed to be published early 2019,<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> while CityGML 3.0 <i>Conceptual Model</i> draft is already publicly available at the <a href="https://github.com/opengeospatial/CityGML-3.0CM">official Github repository</a>. </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/ESRI_shapefile/mbCAeoFp">ESRI shapefile</a></li> <li><a href="/facts/KML/6L7da3xC">KML</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.opengeospatial.org/standards/citygml">CityGML standard page from the Open Geospatial Consortium</a></li> <li><a href="http://www.citygml.org">Official CityGML site</a></li> <li><a href="http://www.citygmlwiki.org">CityGML Wiki</a></li> <li>Free Viewers/Tools for CityGML: <ul><li><a href="https://github.com/tudelft3d/azul">azul</a></li> <li><a href="https://web.archive.org/web/20060828162448/http://www.ikg.uni-bonn.de/aristoteles">Aristoteles</a></li></ul></li> <li>Commercial Viewers/Tools for CityGML: <ul><li><a href="https://www.3dis.de/cityeditor-citygml2cad">CityEditor (SketchUp Plugin)</a></li></ul></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Home". 3dcitydb.net. <a href="http://www.3dcitydb.net/" target="_blank">http://www.3dcitydb.net/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"OGC(R) Adopts CityGML Encoding Standard". OGC®. 19 August 2008. Archived from the original on 19 November 2008. Retrieved 27 September 2008. <a href="https://web.archive.org/web/20081119094900/http://www.opengeospatial.org/pressroom/pressreleases/899" target="_blank">https://web.archive.org/web/20081119094900/http://www.opengeospatial.org/pressroom/pressreleases/899</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Archived CityGML 3.0 Development Repo". GitHub. 24 August 2021. <a href="https://github.com/opengeospatial/CityGML-3.0" target="_blank">https://github.com/opengeospatial/CityGML-3.0</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>