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The Cartographer
GraCT: A Grammar based Compressed representation of Trajectories
December 10, 2016 Β· Declared Dead Β· π SPIRE
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Authors
Nieves R. Brisaboa, AdriΓ‘n GΓ³mez-BrandΓ³n, Gonzalo Navarro, JosΓ© R. ParamΓ‘
arXiv ID
1612.03308
Category
cs.DS: Data Structures & Algorithms
Citations
10
Venue
SPIRE
Last Checked
4 months ago
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.
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