DATABASES INTEGRATION FOR SUPPORTING THE FUTURE PRODUCTION OF IGN BELGIUM GENERALISED MAPS
Anne Féchir, Jan J. De Waele · 2006
KEY WORDS: automatic generalisation, updates propagation, database integration, data conflicts, feature matching. In the near future, IGN Belgium will have to produce updated paper maps from a centralised large-scale geographic database. Two options were investigated in a production environment: automatic generalisation and updates propagation. This paper describes the first thoughts and results regarding the second option. It first considers the databases integration on a conceptual level, then goes deeply into the data synchronisation problem and finally describes a home-made algorithm that makes the link between the corresponding features in the different databases. 1. THE CONTEXT IGN Belgium produces data from scale 1:10 000 to scale 1:250 000. The reference data at scale 1:10 000, once finished, will have taken 15 years to complete. The data at scale 1:50 000 edition 1 required 8 years of production. The classic problem of different production cycles forced IGN Belgium to derive some of the generalised data from another source than the digital 1:10 000 data (Figure 1.). Half of the 1:50 000 scale sheets was based on the old 1:25 000 paper maps that were scanned, generalised and updated at great cost on the field. Most of the second edition 1:50 000 data, currently under process, is produced by collecting scale specific update information.