Recently, The members of the Open Geospatial Consortium, Inc. (OGC) adopted version 1.0.0 of the OpenGIS® CityGML Encoding Standard as an official OGC Standard. According to OIGC, CityGML is an open data model framework and XML-based encoding standard for the storage and exchange of virtual 3D urban models. Also, CityGML is an application schema of the OpenGIS Geography Markup Language 3 (GML3) Encoding Standard, an international standard for spatial data exchange and encoding approved by the OGC and ISO.
According to the CityGMLWiki, “targeted application areas explicitly include urban and landscape planning; architectural design; tourist and leisure activities; 3D cadastres; environmental simulations; mobile telecommunications; disaster management; homeland security; vehicle and pedestrian navigation; training simulators; and mobile robotics.”
CityGML derived from efforts in Germany to integrate and link building information to the surrounding land. Traditionally, this integration has been weak, resulting in many challenges to the building industry as well as planners. And it’s not only technology where there are gaps, the entire building and GIS industries have been at arms length for decades. The hope is that CityGML can provide the standards necessary to bridge those gaps so that models can more accurately reflect the real-world juxtaposition and interrelationships between buildings and land.
In my opinion, all of this leads to virtual worlds. Now, virtual worlds are primarily the domain of gamers and socializers. But virtual worlds are no passing fad. According to a recent Technology Intelligence Group report Virtual World Industry Outlook 2008-2009, “Over one billion dollars were spent by the venture community on startups directly within or supporting virtual worlds between August 2007 and August 2008, and according to virtual world vendors and developers …”
Exciting to me is that with the inevitable merger of real-world models with virtual world technologies, sometimes called the Metaverse, geography and geographic information will be critical. According to the Metaverse Roadmap Overview, the Metaverse is the convergence of 1) virtually-enhanced physical reality and 2) physically persistent virtual space. It is a fusion of both, while allowing users to experience it as either.
I’ve written about The Business Relevance of Virtual Worlds. Others have discussed 3D models in the context of the GeoWeb, which is happening now and will be the precursor to geographically accurate virtual worlds. All of the big players are in this – Autodesk, Bentley, ESRI, Google, and Microsoft, as are some smaller companies such as Galdos Systems and Onuma. The Metaverse requires standards for interoperability, and CityGML is an important standard for now and the future of geographic information online.