VISCO-Querying GIS with Spatial Sketches

Volker Haarslev, Michael Wessel

We demonstrate 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 could be visualized through live animations.

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