This paper reprsents the first effort to apply direct-manipulation (VIS) techniques to spatial data exploration providing mechanisms for visually querying as well as browsing spatial data and fro reviewin the visual results for trend discovery.We present a visual query language (SVIQUEL) which allows us to speicfy the relative spatial position (both topology and direction) between objects usifng driect mainipulation of spatial query filters,called S-sliders.
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