GraCT: A Grammar Based Compressed Representation of Trajectories

  • Nieves R. Brisaboa
  • Adrián Gómez-Brandón
  • Gonzalo Navarro
  • José R. Paramá
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9954)


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.


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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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