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\title{CoGIS: A Cooperative Geographical Information System} 
 
\author{Wesley W. Chu,  Hua Yang, Kuorong Chiang,
Berthier Ribeiro, Gladys Chow \\
Computer Science Department \\  
University of California at Los Angeles \\ 
Los Angeles, CA 90024 \\ 
e-mail: wwc@cs.ucla.edu,  hua@cs.ucla.edu \\
}
 
\begin{document} 
 
\maketitle 
 
\begin{abstract}
Knowledge-based cooperative query answering facilities have been
introduced to the GIS for approximate query answering.
We use context-sensitive spatial type abstraction hierarchies
to provide such cooperative capabilities.
As a result, the ranges of the approximate spatial operators
can be automatically determined by STAHs, rather than
specified by domain experts.
Thus these operators are context-sensitive.
Further, STAHs can be generated automatically from 
geographic databases and thus is scalable.
%Further, CoGIS allows users to pose queries graphically
%and incrementally.
A prototype system - CoGIS - has been implemented to
incorporate these cooperative capabilities.
\end{abstract}

\htmladdnormallink{View the Paper (requiring a postscript viewer)}
{http://burton.cs.ucla.edu/tech-docs/spie.ps}

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