GraCT: A Grammar Based Compressed Representation of Trajectories

  • Nieves R. Brisaboa
  • Adrián Gómez-Brandón
  • Gonzalo Navarro
  • José R. Paramá
Conference paper

DOI: 10.1007/978-3-319-46049-9_21

Part of the Lecture Notes in Computer Science book series (LNCS, volume 9954)
Cite this paper as:
Brisaboa N.R., Gómez-Brandón A., Navarro G., Paramá J.R. (2016) GraCT: A Grammar Based Compressed Representation of Trajectories. In: Inenaga S., Sadakane K., Sakai T. (eds) String Processing and Information Retrieval. SPIRE 2016. Lecture Notes in Computer Science, vol 9954. Springer, Cham

Abstract

We present a compressed data structure to store free trajectories of moving objects (ships over the sea, for example) allowing spatio-temporal queries. Our method, GraCT, uses a \(k^2\)-tree to store the absolute positions of all objects at regular time intervals (snapshots), whereas the positions between snapshots are represented as logs of relative movements compressed with Re-Pair. Our experimental evaluation shows important savings in space and time with respect to a fair baseline.

Copyright information

© Springer International Publishing AG 2016

Authors and Affiliations

  • Nieves R. Brisaboa
    • 1
  • Adrián Gómez-Brandón
    • 1
  • Gonzalo Navarro
    • 2
  • José R. Paramá
    • 1
  1. 1.Depto. de ComputaciónUniversidade da CoruñaCoruñaSpain
  2. 2.Department of Computer ScienceUniversity of ChileSantiagoChile

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