Prof. Dr. Jürgen Döllner

OGC and OWS-4

The Hasso-Plattner-Institut, an associate member of the Open Geospatial Consortium,  contributed to the OGC Web-Service Initiative, Phase 4 (OWS-4). Based on the LandXplorer platform provided by 3DGeo GmbH, we set up an experimental 3D viewer based on LandXplorer Studio that supports the web-service based, ad-hoc construction of virtual 3D city models.


  • OGC: http://www.opengeospatial.org/
  • 3D Geo: http://www.3dgeo.de
  • OWS-4 Overview: http://www.opengeospatial.org/projects/initiatives/ows-4
  • OWS-4 Demo: http://www.opengeospatial.org/pub/www/ows4/index.html

Please, find information, images, and video about our contribution to OWS-4 below.

OGC Web Service-Based 3D Viewer Client

This project is part of the CAD/GIS/BIM thread in the OGC Open Web Services initiative, phase 4 (OWS-4) and targets on the utilization of Geoinformation Services for finding and accessing geoinformation. In a testbed the capabilities of CityGML are used for bridging the gap between CAD (computer aided design) and BIM (building information model) on the one hand and GIS (geographic information systems) on the other hand, supported by a transformation of BIM data into CityGML - see Figure 1 and 2.

Figure 1: Terrain, map layers, context buildings, and detailed hangar model integrated in one 3D scene from distributed sources via OGC Web Feature Services (CityGML) and Web Map Services.
Figure 2: Same scene showing integrated color-coded BIM data.

The LandXplorer CityGML Viewer was extended to enable access to distributed geoinformation via OGC web services (WMS, WFS). It is used to integrate  various building information that are exchanged in the CityGML format, but also for the integration of common 2D geoinformation as map layers.

In OWS-4 at all and in particular the CAD/GIS/BIM thread, we worked together with a number of partners who provided capabilities in the field of data transformation and data provision. The sequence diagram in Figure 3 visualizes the activities performed by the LandXplorer CityGML Viewer in the context of the OWS-4 testbed scenario.

Figure 3: Workflow sequence for LandXplorer CityGML Viewer in OWS-4.

This project revealed several future challenges for 3D Viewer Clients, e.g., the georeferencing of CAD data, the integration of different coordinate systems, the provision of compression for large CityGML data sets, and the preservation of CAD and BIM information along the visualization process (IFC attributes, references to original CAD data, groupings).

For demonstrating the functional interoperability between CAD/BIM and GIS, the LandXplorer CityGML Viewer (provided by 3D Geo GmbH) was further extended with a building room report utilizing the building information implanted into CityGML. Figure 2 shows a color-based visualization of different BIM attribute values in the geospatial context.


A video that shows the 3D viewer in action and a more detail description of OWS-4 scenario can be found at the official OWS-4 demonstration website: http://www.opengeospatial.org/pub/www/ows4/index.html.