Efficient distance-based representative skyline computation in 2D space

Rui Mao, Taotao Cai, Rong-Hua Li, Jeffrey Xu Yu, Jianxin Li

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Representative skyline computation is a fundamental issue in database area, which has attracted much attention in recent years. A notable definition of representative skyline is the distance-based representative skyline (DBRS). Given an integer k, a DBRS includes k representative skyline points that aims at minimizing the maximal distance between a non-representative skyline point and its nearest representative. In the 2D space, the state-of-the-art algorithm to compute the DBRS is based on dynamic programming (DP) which takes O(km2) time complexity, where m is the number of skyline points. Clearly, such a DP-based algorithm cannot be used for handling large scale datasets due to the quadratic time cost. To overcome this problem, in this paper, we propose a new approximate algorithm called ARS, and a new exact algorithm named PSRS, based on a carefully-designed parametric search technique. We show that the ARS algorithm can guarantee a solution that is at mostlarger than the optimal solution. The proposed ARS and PSRS algorithms run in and O(k2 log3m) time respectively, where T is no more than the maximal distance between any two skyline points. We also propose an improved exact algorithm, called PSRS+, based on an effective lower and upper bounding technique. We conduct extensive experimental studies over both synthetic and real-world datasets, and the results demonstrate the efficiency and effectiveness of the proposed algorithms. © 2016, Springer Science+Business Media New York.
Original languageEnglish
Pages (from-to)621-638
Number of pages18
JournalWorld Wide Web
Volume20
Issue number4
DOIs
Publication statusPublished - 1 Jul 2017

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