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TKDE
2011

Continuous Monitoring of Distance Based Range Queries

8 years 6 months ago
Continuous Monitoring of Distance Based Range Queries
Given a positive value r, a distance based range query returns the objects that lie within the distance r of the query location. In this paper, we focus on the distance based range queries that continuously change their locations in a Euclidean space. We present an efficient and effective monitoring technique based on the concept of a safe zone. The safe zone of a query is the area with a property that while the query remains inside it, the results of the query remain unchanged. Hence, the query does not need to be re-evaluated unless it leaves the safe zone. Our contributions are as follows. 1) We propose a technique based on powerful pruning rules and a unique access order which efficiently computes the safe zone and minimizes the I/O cost. 2) We theoretically determine and experimentally verify the expected distance a query moves before leaving the safe zone and, for majority of queries, the expected number of guard objects. 3) Our experiments demonstrate that the proposed ...
Muhammad Aamir Cheema, Ljiljana Brankovic, Xuemin
Added 20 Aug 2011
Updated 21 Aug 2011
Type Journal
Year 2011
Where TKDE
Authors Muhammad Aamir Cheema, Ljiljana Brankovic, Xuemin Lin, Wenjie Zhang, Wei Wang
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