GraCT: A Grammar based Compressed representation of Trajectories

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.

Comment: This research has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie Actions H2020-MSCA-RISE-2015 BIRDS GA No. 690941

Original document

The different versions of the original document can be found in:

• http://arxiv.org/abs/1612.03308

• http://arxiv.org/pdf/1612.03308

• http://dx.doi.org/10.1007/978-3-319-46049-9_21 under the license http://www.springer.com/tdm

• http://hdl.handle.net/2183/18176

• http://link.springer.com/content/pdf/10.1007/978-3-319-46049-9_21,

http://dx.doi.org/10.1007/978-3-319-46049-9_21 under the license http://www.springer.com/tdm

• https://dblp.uni-trier.de/db/journals/corr/corr1612.html#BrisaboaGNP16,

https://link.springer.com/chapter/10.1007/978-3-319-46049-9_21,

https://core.ac.uk/display/80522509,

https://ui.adsabs.harvard.edu/abs/2016arXiv161203308B/abstract,

https://arxiv.org/abs/1612.03308,

https://doi.org/10.1007/978-3-319-46049-9_21,

http://doi.org/10.1007/978-3-030-00479-8_9,

https://arxiv.org/pdf/1612.03308.pdf,

https://ruc.udc.es/dspace/handle/2183/18176,

https://rd.springer.com/chapter/10.1007/978-3-030-00479-8_9,

https://link.springer.com/chapter/10.1007/978-3-319-46049-9_21/fulltext.html,

https://academic.microsoft.com/#/detail/2521266394