Efficient evaluation of location-dependent skyline queries using non-dominance scopes

  • Authors:
  • Ken C. K. Lee

  • Affiliations:
  • University of Massachusetts Dartmouth, North Dartmouth, MA

  • Venue:
  • Proceedings of the 2nd International Conference on Computing for Geospatial Research & Applications
  • Year:
  • 2011

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Abstract

With respect to a given query point q, a location-dependent skyline query (LDSQ) finds all objects that are not spatially dominated by any other in a specified set of objects. An object o is considered to spatially dominate another o' if o is not worse than o' for all search criteria and strictly better than o' for at least one of the search criteria. Here, the search criteria include the objects' nearness to q and their non-spatial attributes. LDSQs have many valuable applications that need to find the best and nearest objects. Nevertheless, efficient evaluation of LDSQs faces challenges due to exhaustive comparisons among objects in determining their spatial dominance relationships which in turn depend on query points at the run time. In this paper, we introduce a notion of non-dominance scopes. For each object, a non-dominance scope is an area in which query points find the object not spatially dominated by other objects. With non-dominance scopes, LDSQs are simplified as searches for objects whose non-dominance scopes enclose query points. We develop algorithms to compute non-dominance scopes and evaluate LDSQs using indexed non-dominance scopes. We also evaluate our proposed approach. The experiment results show the outstanding performance of our proposed approach.