Ludwig-Maximilians-Universität München, Institut für Informatik
Technical Report 93-16
- TITLE:
-
A Unified Approach to Geographic Data Modeling
- DATE:
-
November 1993
- AUTHORS:
- Agnes Voisard (voisard@inf.fu-berlin.de)
- R. David
- Institut für Informatik
- Freie Universitaet Berlin
- Takustr. 9
- D-14195 Berlin (Germany)
- KEYWORDS:
-
spatial database systems, data models, spatial abstract data types
- ABSTRACT:
-
In this paper we study the power of defining and
manipulating geographic information (maps) using
(i) a rigorous definition of spatial
abstract data types, and
(ii) general database features (data models and algebraic operations).
Our work is based on a complex object model, whose set
and tuple constructors make it efficient for defining not only collections
of geographic objects but also any relationships between them. Note that
the goal is not to define another map model,
but to show that efficiency in both representation and manipulation can be
achieved if certain conditions are respected.
We present three classes of operators that are necessary for an
efficient handling of geographic information in a DBMS context. We then study
the impact of this classification on the extensibility of geographic DBMS (at a
``logical'' level). This issue is discussed in theory and practice, taking as
underlying database models both an extended relational and an object-oriented o
ne.
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Robert Stabl
(28.11.1994)