In this paper, we propose the pyramidal information model for GIS. This information model consists of multi-layers/multi-phase with a view to growing up the functionality. Also, it associates three funct ions to manage map data effectually: inheritance function, ouverlay function and generalization function. Our idea for composing our pyramidal information model is to introudce various concepts of object orientation in order to manage various geographic information effectively and compose various types of application-dependent maps smartly: identity among objects, complex object, etc.
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