382Accesses
Definition
Given a set of pointsP in a multi-dimensional space, the nearest neighbor (NN) of a query pointq is the point inP that is closest toq. Similarly, thek nearest neighbor (kNN) set ofq consists of thek points inP with the smallest distances fromq. In spatial and spatio-temporal databases, the distance is usually defined according to the Euclidean metric, and the datasetP is disk-resident. Query algorithms aim at minimizing the processing cost. Other optimization criteria in the case of moving objects (or queries) include the network latency, or the number of queries required for keeping the results up-to-date.
Historical Background
Nearest neighbor (NN) search is one of the oldest problems in computer science. Several algorithms and theoretical performance bounds have been devised for exact and approximate processing in main memory [1]. In spatial databases, existing algorithms assume thatPis indexed by a spatial access method (usually...
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Authors and Affiliations
Hong Kong University of Science and Technology, Hong Kong, China
Dimitris Papadias
- Dimitris Papadias
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Editors and Affiliations
College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA
LING LIU (Professor) (Professor)
Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada
M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)
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Papadias, D. (2009). Nearest Neighbor Query in Spatio-temporal Databases. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_244
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