Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/181

Spatial queries in dynamic environments

Authors Tao, YF
Papadias, D
Issue Date 2003
Source ACM transactions on database systems, v. 28, (2), 2003, JUN, p. 101-139
Summary Conventional spatial queries are usually meaningless in dynamic environments since their results may be invalidated as soon as the query or data objects move. In this paper we formulate two novel query types, time parameterized and continuous queries, applicable in such environments. A time-parameterized query retrieves the actual result at the time when the query is issued, the expiry time of the result given the current motion of the query and database objects, and the change that causes the expiration. A continuous query retrieves tuples of the form < result, interval>, where each result is accompanied by a future interval, during which it is valid. We study time-parameterized and continuous versions of the most common spatial queries (i.e., window queries, nearest neighbors, spatial joins), proposing efficient processing algorithms and accurate cost models.
Subjects
ISSN 0362-5915
Rights © ACM, 2003. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in ACM transactions on database systems
Language English
Format Article
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