OGC/EuroSDR/Geonovum workshop ‘CityGML for national mapping’

Contributed by: 
Jantien Stoter, affiliated with TU Delft, Kadaster and Geonovum in The Netherlands & Chair of EuroSDR commission Data Specifications, and Carsten Rönsdorf, Head of Advisory Services, Ordnance Survey International and Chair of OGC CityGML Specification Wor

OGC, EuroSDR and Geonovum have organised a workshop on CityGML for national mapping, which will be held 21/22 January 2013 at IGN in Paris. The aim of the workshop is to present implementations of the OGC CityGML Encoding Standard, an open data model and XML-based format for the storage and exchange of virtual 3D city models. Workshop participants will also explore what is needed to make the standard further fit for 3D implementation covering large areas and various application domains.

CityGML figure

Over the past ten years technologies for generating, maintaining and using 3D geo-information have matured. Many local governments have 3D models of their cities, a large number of companies are providing services for constructing 3D models, and universities and research organisations are investigating 3D technologies. Organisations face challenges in introducing 3D applications and technologies into their day-to-day processes, but despite the practical difficulties, it is clear that 3D information is becoming increasingly important.

For national mapping agencies one of the challenges is how to best extend their 2D mapping activities into 3D. Several national mapping agencies have taken this step. For example, Swisstopo maintains topographic data (roads, buildings, vegetation etc.) at the largest scale, i.e. 1:10k in 3D and derives the 2D map from that database. The Netherlands has established a national 3D standard for their large-scale topography (scale 1:1k) as an extension of CityGML that covers the whole country; and Ordnance Survey, Great Britain has hired a 3D product manager to realise a 3D extension of their products.

To advance in the domain of 3D information, it is important to make agreements at the international level on how to model our environment in 3D. The establishment of the 3D OGC CityGML Standard by the Open Geospatial consortium was an important step in this process. Further developments of the standard will evolve from experience and the requirements that become apparent in practice.

In this workshop we will exchange knowledge, experiences and issues on how to create and provide 3D data from existing 2D data sets. In discussions, we will identify the benefits and barriers to the provision of 3D geospatial data and related services by National Mapping Agencies (and other mapping authorities). We will specifically explore the relationship between 2D and 3D data because extending 2D data into 3D seems the only feasible way to map large areas in 3D. From these discussions, the workshop will identify the potentials of the CityGML standard and define requirements for future developments of it.

The workshop is open for everyone but mainly aims to boost discussions between mapping authorities of different countries. Register at: www.geonovum.nl/3dpilot/aanmelden-workshopCityGML

Carsten Roensdorf




Carsten Rönsdorf, Head of Advisory Services, Ordnance Survey International and Chair of OGC CityGML Specification Working Group