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ABSTRACT
Closed semi-algebraic sets in the plane form a powerful model of planar spatial datasets. We establish a characterization of the topological properties of such datasets expressible in the relational calculus with real polynomial constraints. The characterization is in the form of a query language that can only talk about points in the set and the "cones" around these points.
REFERENCES
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[doi> 10.1145/182591.182640]
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