Querying GIS with Animated Spatial Sketches

Authors:
Volker Haarslev;Michael Wessel
Affiliations:
-;-
Venue:
VL '97 Proceedings of the 1997 IEEE Symposium on Visual Languages (VL '97)
Year:
1997

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Abstract

We present the design of the visual query system VISCO that offers a sketch-based query language for defining approximate spatial constellations of objects. VISCO smoothly integrates geometrical and topological querying with deductive spatial reasoning. It is based on a strong physical metaphor visualizing semantics of query elements. Approximate queries rely on combined topological and geometrical constraints enhanced with relaxations and "don't cares" that are visualized through live animations.