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THE HARMONISATION CHALLENGE OF CORE NATIONAL TOPOGRAPHIC DATABASES IN THE EU-PROJECT GIMODIG
Abstract and Figures
The project GiMoDig (Geospatial Info-Mobility Service by Real-Time Data Integration and Generalisation) started in November 2001 and is funded by the European Union. With a duration of 3 years this EU-project has the goal to develop methods for harmonisation, generalisation and visualisation of national topographic data sets for mobile users in real time. The project partners are the Finnish Geodetic Institute as a project coordinator, the National Mapping Agencies (NMAs) of Denmark, Finland, Sweden and Germany and the University of Hanover, the Institute of Cartography and Geoinformatics. One of the tasks in the GiMoDig project is to define a Global Schema for the core national topographic data sets. For this purpose an inventory on the national databases is prepared to list the differences in data availability and data modelling. Based on that inventory, a selection of feature types suitable for Location Based Services (LBS) is made. The idea is to use the least common denominator as selection criteria but this subset already lacks some important feature types. Finally all features that are supported by a majority of national data sets are integrated in the Global Schema. The Global Schema is defined with a detailed description about feature type, attributes, collection criteria and geometry type. All necessary information about harmonisation operations are given to be able to transform the topographic data from the national schema into the Global Schema. Further scrutinizations of test data lead to an improvement and adaptation of the Global Schema.
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