Definition and manipulation of graphical entities in geographic information systems

  • Richard L. Phillips
2. Geographic Applications — Planning
Part of the Lecture Notes in Computer Science book series (LNCS, volume 81)


Geographic information systems have much in common with generalized data base management systems. Both types of systems require the definition of items, attributes, and higher level constructs involving them, e.g. records. Geographic information systems deal in addition with graphical entities, a concept unknown in data base management systems. Not surprisingly, geographic systems have little in common; each one is a new "invention." This paper explores the graphic requirements of two typical geographic information systems with the aim of identifying how such entities are defined, used, and stored in a data base. Examples are drawn from a cartographic system where only graphic display is important, and a query system where graphical entities play an important role in both extraction and display of data. Conclusions are drawn in terms of the shortcomings of generalized data base management systems with regard to data definition, data storage, and data manipulation. The interdependence of these operations is discussed, illustrating that the way in which a graphical entity is manipulated by the user impacts on its definition and storage.


Water Quality Data Database Management System Geographic Information System Data Base Management System Graphical Entity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1980

Authors and Affiliations

  • Richard L. Phillips
    • 1
  1. 1.Computer, Information, and Control EngineeringThe University of MichiganAnn ArborU.S.A

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