2009 | OriginalPaper | Buchkapitel
Efficient Continuous Nearest Neighbor Query in Spatial Networks Using Euclidean Restriction
verfasst von : Ugur Demiryurek, Farnoush Banaei-Kashani, Cyrus Shahabi
Erschienen in: Advances in Spatial and Temporal Databases
Verlag: Springer Berlin Heidelberg
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In this paper, we propose an efficient method to answer continuous
k
nearest neighbor (C
k
NN) queries in spatial networks. Assuming a moving query object and a set of data objects that make frequent and arbitrary moves on a spatial network with dynamically changing edge weights, C
k
NN continuously monitors the nearest (in network distance) neighboring objects to the query. Previous C
k
NN methods are inefficient and, hence, fail to scale in large networks with numerous data objects because: 1) they heavily rely on Dijkstra-based
blind expansion
for network distance computation that incurs excessively redundant cost particularly in large networks, and 2) they
blindly map
all object location updates to the network disregarding whether the updates are relevant to the C
k
NN query result. With our method, termed ER-C
k
NN (short for
Euclidian Restriction
based C
k
NN), we utilize ER to address both of these shortcomings. Specifically, with ER we enable 1)
guided search
(rather than blind expansion) for efficient network distance calculation, and 2)
localized mapping
(rather than blind mapping) to avoid the intolerable cost of redundant object location mapping. We demonstrate the efficiency of ER-C
k
NN via extensive experimental evaluations with real world datasets consisting of a variety of large spatial networks with numerous moving objects.