THE DATA MODEL - THE DATA MODEL geographical variation in...

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THE DATA MODEL geographical variation in the real world is infinitely complex o the closer you look, the more detail you see, almost without limit it would take an infinitely large database to capture the real world precisely o data must somehow be reduced to a finite and manageable quantity by a process of generalization or abstraction o geographical variation must be represented in terms of discrete elements or objects the rules used to convert real geographical variation into discrete objects is the data model o Tsichritzis and Lochovsky (1977) define a data model as "a set of guidelines for the representation of the logical organization of the data in a database. .. (consisting) of named logical units of data and the relationships between them."1 current GISs differ according the way in which they organize reality through the data model each model tends to fit certain types of data and applications better than others the data model chosen for a particular project or application is also influenced by:
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