Continuous aggregate nearest neighbor queries

Hicham G. Elmongui, Mohamed F. Mokbel, Walid G. Aref

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


This paper addresses the problem of continuous aggregate nearest-neighbor (CANN) queries for moving objects in spatio-temporal data stream management systems. A CANN query specifies a set of landmarks, an integer k, and an aggregate distance function f (e. g., min, max, or sum), where f computes the aggregate distance between a moving object and each of the landmarks. The answer to this continuous query is the set of k moving objects that have the smallest aggregate distance f. A CANN query may also be viewed as a combined set of nearest neighbor queries. We introduce several algorithms to continuously and incrementally answer CANN queries. Extensive experimentation shows that the proposed operators outperform the state-of-the-art algorithms by up to a factor of 3 and incur low memory overhead.

Original languageEnglish (US)
Pages (from-to)63-95
Number of pages33
Issue number1
StatePublished - Jan 1 2013


  • Aggregate nearest neighbor
  • Continuous query
  • Spatio-temporal query

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