Data Modelling and Database Requirements for Geographical Data
نویسنده
چکیده
An overview of the fields of data modelling, database systems and geographical information systems is presented as a background. Requirements to a data model and a data modelling methodology for geographical data are investigated and presented. Another contribution is an extension of the traditional ER-diagrams to better communicate the semantics of geographical data. The approach is based on earlier work on Sub-Model Substitution, and adds new symbology that is relevant for geographical data. Database system requirements for geographical data servers are investigated and presented, together with new ideas on distribution of geographical data for parallel processing.
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