The Open Geospatial Consortium (OGC) membership has adopted Version 2.0 of the OGC City Geography Markup Language (CityGML) Encoding Standard. CityGML is a community defined information model and XML-based encoding for the representation, storage, and exchange of virtual 3D city and landscape models. It provides a standard model and mechanism for describing 3D objects with respect to their geometry, topology, semantics and appearance, and defines five different levels of detail. It is highly scalable and datasets can include different urban entities supporting the general trend toward modeling not only individual buildings but also whole sites, districts, cities, regions, and countries. CityGML provides much more than 3D content for visualisation by diverse applications. It allows users to share virtual 3D city and landscape models for sophisticated analysis and display tasks in application domains such as environmental simulations, energy demand estimations, city lifecycle management, urban facility management, real estate appraisal, disaster management, pedestrian navigation, robotics, urban data mining, and location based marketing. Because CityGML is based on the OGC Geography Markup Language Encoding Standard (GML), it can be used with the whole family of OGC web services for data accessing, processing, and cataloging. It has been implemented in many software solutions and is in use in many projects around the world.
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