First International Workshop on
Next Generation 3D City Models

Bonn, Germany | 21-22 June 2005

Call for Participation

Workshop program has been finalized and is also available as a PDF document (2,5 MB).


The workshop will be organized by the ISPRS, the German Society for Photogrammetry and Remote Sensing (DGPF), European Spatial Data Research (EuroSDR), and the University of Bonn.

Workshop Scope

3D city models are an emerging field in geo-information science. Traditionally, modeling has been focused on graphical representations with limited support of semantic aspects, topology, and interoperability. However, there is a growing number of applications of 3D city models like disaster management, environmental simulations, computer aided architectural design (CAAD), and regional planning, that require more sophisticated models beyond visualization.

Next generation 3D city models must be multifunctional, interoperable, intelligent, and multi-representational in order to be economical and sustainable. Interoperability means that different models and model parts may be smoothly integrated within spatial data infrastructures and may easily collaborate with systems from the domains of CAAD and computer graphics. An intelligent 3D city model is a semantic model, where objects know about their structure, thematic properties, and interrelationships with other objects. Furthermore, behaviors might be assigned to objects which, for example, could control the adaptation of geometries when different objects are integrated. Special challenges arise from the need to manage multiple representations of entities in 3D city models concerning different scales, evolution over time, and concurrent versions. The new model quality also demands for advanced acquisition tools. These have to cope with the extraction of semantically meaningful features from images and laser scanning data, scale transitions, geometric and topological consistency, and international standards.

In a special workshop session, the results of the 2004 EuroSDR test on building extraction from aerial images and/or airborne laser scanning data will be presented by the Finnish Geodetic Institute, which is the pilot center for the test evaluation. 11 participants from academia, industry and national mapping agencies performed the building extraction tasks and the results were analysed with respect to geometric point accuracy, building length accuracy, level of automation, shape dissimilarity, economical aspects etc.

The workshop is intended for researchers and practitioners in the fields of modeling, generation, and applications of 3D city models. It provides an international forum for the discussion and presentation of current problems and achievements regarding the development of the next generation 3D city models.


  • Semantic modeling for 3D city models
  • Integration of GIS models and CA(A)D models
  • Management of multiple representations: multi-scale (levels of detail), versions, history
  • Interoperability and standardization
  • Data integration (digital elevation models and 3D objects; datasets from different providers; homogenization)
  • Innovative visualization techniques
  • New paradigms for 3D GIS
  • Multi resolution databases
  • Automatic and semi-automatic techniques for the acquisition of 3D city models
  • Interpretation of city objects in images and laser data
  • Data mining in 3D city models
  • Applications of 3D city models beyond visualization