The national topographic basedata should meet a variety of user requirements. To maintain and handle the national topographic basedata in effective way, nationally supported research works on data model, structure and feature calssification system sho...
The national topographic basedata should meet a variety of user requirements. To maintain and handle the national topographic basedata in effective way, nationally supported research works on data model, structure and feature calssification system should be intensively undertaken by government agency, research institute and university. Around 1000 titles of digital map data from National Geography Institute(NGI) were investigated and analyzed for checking data quality and identifying specific feature code occurrence. The close investigation resulted in a comprehensive classification system common to all scales of data generated by NGI. The definition and difference between Unique Feature Identifier(UFID) and Entity Serial Number(ESN) were given and explained. An overall proposition for Korean UFID system was made in aiming to satisfy internal and external uses for NGI and NGIS, respectively. The techinical definitions of conceptual, logical and semantic model for proposed data model were documented. The key aspects of the proposed data model are flexibility as well as step-by-step approach for modification as necessary. In addition, the proposed data model was designed to move toward object oriented data model. The overall strategy for re-engineering data was also proposed.