At the Geospatial World Forum in Amsterdam, Jantien Stoter of the Delft Univeristy of Technology and an advisor to Geonovum, gave an overview of the ongoing work on the Dutch 3D standard, which is being piloted by about 100 organizations in the Netherlands. Geonovum is the National Spatial Data Infrastructure (NSDI) executive committee in the Netherlands. Its goal is to provide better access to geo-information in the public sector and is responisble for developing and maintaining the standards for geospatial information that are necessary to achieve this goal.
The Dutch 3D standard integrates CityGML and the Dutch IMGeo standard.
- CityGML is an Open Geospatial Consortium (OGC) standard for 3D information (geometry and semantics) about cities, external to buildings. GeoBIM is a CityGML Application Domain Extension (ADE) intended to extend CityGML to include detailed, semantic information about the inside of buildings. GeoBIM was initiated in 2009. The last official update was completed in 2010.
- IMGeo is the Dutch standard for the exchange of large scale geography such as roads, tunnels, water bodies, land use, and so on. IMGeo is intended to be a scale-independent object model providing a uniform nationwide coverage. IMGeo 2.0 contains a mandatory part, the Basisregistratie Grootschalige Topografie (BGT). which has legal status in the Netherlands, plus additonal data. IMGeo is 2D, but is extensible to 2.5D and ultimately to 3D. Like CityGML, IMGeo recognizes levels of detail (LOD).
There are six work groups involved in the Dutch 3D standard effort. For example, one is responsible for compiling killer applications using the 3D standard.
One of the work groups could have broad implications, potentially beyond the borders of the Netherlands, This work group is responsible for aligning the CityGML ADE GeoBIM standard and the Industry Foundation Classes (IFC) BIM standard maintained by BuildingSmart. IFC is intended to enable the exchange of BIM data between applications developed by different software vendors in a vendor-neutral way. The objective of the work group is to define a standard, semantically meaningful mapping between IFC and GeoBIM.