# UV-diagram: a voronoi diagram for uncertain spatial databases

UV-diagram: a voronoi diagram for uncertain spatial databases The Voronoi diagram is an important technique for answering nearest-neighbor queries for spatial databases. We study how the Voronoi diagram can be used for uncertain spatial data, which are inherent in scientific and business applications. Specifically, we propose the Uncertain-Voronoi diagram (or UV-diagram ), which divides the data space into disjoint “UV-partitions”. Each UV-partition $$P$$ is associated with a set $$S$$ of objects, such that any point $$q$$ located in $$P$$ has the set $$S$$ as its nearest neighbor with nonzero probabilities. The UV-diagram enables queries that return objects with nonzero chances of being the nearest neighbor (NN) of a given point $$q$$ . It supports “continuous nearest-neighbor search”, which refreshes the set of NN objects of $$q$$ , as the position of $$q$$ changes. It also allows the analysis of nearest-neighbor information, for example, to find out the number of objects that are the nearest neighbors of any point in a given area. A UV-diagram requires exponential construction and storage costs. To tackle these problems, we devise an alternative representation of a UV-diagram, by using a set of UV-cells . A UV-cell of an object $$o$$ is the extent $$e$$ for which $$o$$ can be the nearest neighbor of any point $$q \in e$$ . We study how to speed up the derivation of UV-cells by considering its nearby objects. We also use the UV-cells to design the UV-index , which supports different queries, and can be constructed in polynomial time. We have performed extensive experiments on both real and synthetic data to validate the efficiency of our approaches. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The VLDB Journal Springer Journals

# UV-diagram: a voronoi diagram for uncertain spatial databases

, Volume 22 (3) – Jun 1, 2013
26 pages
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Publisher
Springer-Verlag
Copyright
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Subject
Computer Science; Database Management
ISSN
1066-8888
eISSN
0949-877X
D.O.I.
10.1007/s00778-012-0290-x
Publisher site
See Article on Publisher Site

### Abstract

The Voronoi diagram is an important technique for answering nearest-neighbor queries for spatial databases. We study how the Voronoi diagram can be used for uncertain spatial data, which are inherent in scientific and business applications. Specifically, we propose the Uncertain-Voronoi diagram (or UV-diagram ), which divides the data space into disjoint “UV-partitions”. Each UV-partition $$P$$ is associated with a set $$S$$ of objects, such that any point $$q$$ located in $$P$$ has the set $$S$$ as its nearest neighbor with nonzero probabilities. The UV-diagram enables queries that return objects with nonzero chances of being the nearest neighbor (NN) of a given point $$q$$ . It supports “continuous nearest-neighbor search”, which refreshes the set of NN objects of $$q$$ , as the position of $$q$$ changes. It also allows the analysis of nearest-neighbor information, for example, to find out the number of objects that are the nearest neighbors of any point in a given area. A UV-diagram requires exponential construction and storage costs. To tackle these problems, we devise an alternative representation of a UV-diagram, by using a set of UV-cells . A UV-cell of an object $$o$$ is the extent $$e$$ for which $$o$$ can be the nearest neighbor of any point $$q \in e$$ . We study how to speed up the derivation of UV-cells by considering its nearby objects. We also use the UV-cells to design the UV-index , which supports different queries, and can be constructed in polynomial time. We have performed extensive experiments on both real and synthetic data to validate the efficiency of our approaches.

### Journal

The VLDB JournalSpringer Journals

Published: Jun 1, 2013

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