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URN: urn:nbn:de:0030-drops-12864
URL: http://drops.dagstuhl.de/opus/volltexte/2007/1286/
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Kuijpers, Bart ; Othman, Walied

An analytic solution to the alibi query in the bead model for moving object data

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Abstract

Moving objects produce trajectories, which are stored in databases by means of finite samples of time-stamped locations. When also speed limitations in these sample points are known, beads can be used to model the uncertainty about the object's location in between sample points. In this setting, a query of particular interest, that has been studied in the literature of geographic information systems (GIS), is the alibi query. This boolean query asks whether two moving objects can have physically met. This adds up to deciding whether the necklaces of beads of these objects intersect. This problem can be reduced to deciding whether two beads intersect. Since, existing software to solve this problem fails to answer this question within a reasonable time, we propose an analytical solution to the alibi query, which can be used to answer the alibi query in constant time, a matter of milliseconds or less, for two single beads and in time proportional to the product of their lengths for necklaces of beads.

BibTeX - Entry

@InProceedings{kuijpers_et_al:DSP:2007:1286,
  author =	{Bart Kuijpers and Walied Othman},
  title =	{An analytic solution to the alibi query in the bead model for moving object data},
  booktitle =	{Constraint Databases, Geometric Elimination and Geographic Information Systems},
  year =	{2007},
  editor =	{Bernd Bank and Max J. Egenhofer and Bart Kuijpers},
  number =	{07212},
  series =	{Dagstuhl Seminar Proceedings},
  ISSN =	{1862-4405},
  publisher =	{Internationales Begegnungs- und Forschungszentrum f{\"u}r Informatik (IBFI), Schloss Dagstuhl, Germany},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2007/1286},
  annote =	{Keywords: Beads, uncertainty, alibi, query, solution, quantifier elimination, constraint database}
}

Keywords: Beads, uncertainty, alibi, query, solution, quantifier elimination, constraint database
Seminar: 07212 - Constraint Databases, Geometric Elimination and Geographic Information Systems
Issue Date: 2007
Date of publication: 17.12.2007


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