Karlsruhe, once the capital of the state of Baden with its palatial residence, now a lively university city and home to the KIT technology centre. With its fan-like architectural layout, the city is a popular travel destination.
The municipal government of Karlsruhe is responsible for an urban area of 173 km², with 27 districts and a total population of approximately 300,000.
The city‘s Property Register Department (Liegenschaftsamt) is responsible for all matters related to land, real estate and housing, including buying and selling, land and forestry management, surveying and processing spatial information. This also extends to collecting and processing
3D data of the urban area. Since 2007, the department has been compiling a complete 3D model of the city of Karlsruhe.
The department employs FME spatial ETL technology for processing its 3D data. Using FME Desktop, the recorded building data is enriched and then converted into CityGML format: the initial data used in this process is building data in level-of-detail 2 (LoD 2) which was modelled in a CAD system, plus attribute and address information that is already available in Microsoft Excel and Esri Shape format.
The data is combined by means of a joint building key, enriched with semantic information, and finally converted into CityGML format.
The transformation process is implemented by means of an automated FME workflow. Once modelled, this FME process can be run repeatedly each time data is outputted or forwarded. User-dependent input parameters can be fed into the process in real time, in the form of so-called ‘published parameters‘. The city model of Karlsruhe, for instance, can be outputted in three different degrees of detail.
Using the FME Workbench, employees at the authority can perform their own data transformations into CityGML format with the aid of the workflow. If any other 3D data formats are required, it is possible to modify the process chain in the workbench: data sources (Reader), tools (Transformer) and results data (Writer) can be recombined using drag & drop.
By employing FME Desktop, the Property Register Department is now able to transfer 3D data it has collected quickly and efficiently into the CityGML format using a standardised workflow. The 3D building model database can be expanded continuously while maintaining constant quality. At the same time, the department has FME at its disposal as a basic technology for processing other 3D and spatial data.