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Title: Spatio-temporal aggregation using sketches
Authors: Tao, Yufei
Kollios, George
Condidine, Jeffrey
Li, Feifei
Papadias, Dimitris
Keywords: Data mining
Database indexing
Query processing
Temporal databases
Tree data structures
Issue Date: Apr-2004
Citation: 20th International Conference on Data Engineering, p. 214-225
Abstract: Several spatio-temporal applications require the retrieval of summarized information about moving objects that lie in a query region during a query interval (e.g., the number of mobile users covered by a cell, traffic volume in a district, etc.). Existing solutions have the distinct counting problem: if an object remains in the query region for several timestamps during the query interval, it will be counted multiple times in the result. The paper solves this problem by integrating spatio-temporal indexes with sketches, traditionally used for approximate query processing. The proposed techniques can also be applied to reduce the space requirements of conventional spatio-temporal data and to mine spatio-temporal association rules.
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