Encyclopedia of Big Data Technologies

Living Edition
| Editors: Sherif Sakr, Albert Zomaya

Spatiotemporal Data: Trajectories

  • Xiaofang Zhou
  • Lei Li
Living reference work entry
DOI: https://doi.org/10.1007/978-3-319-63962-8_221-1

Synonyms

Definition

Let p(l, t) be a spatiotemporal point with location l at time t. A trajectory is defined as τ =< p1, p2pn > where pi.t ≤ pj.t if i < j. That is, a trajectory is a sequence of spatiotemporal points ordered by time.

Location l can be represented as a longitude and latitude pair in geographical space or a road segment ID and distance offset in a road network. A trajectory without temporal information is often called route or path, and a collection of trajectories of an object is called its trace. The trajectory with a specific origin and destination pair (OD pair) is also called a trip.

Overview

A trajectory records how an object moved in a space. Such information is easier than ever to acquire with the prevalence of location-capturing devices such as GPS nowadays. Therefore, large volumes of trajectory data are being accumulated from various sources every day, for animals, human, vehicles, and natural...

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References

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.School of Information Technology and Electrical EngineeringUniversity of QueenslandBrisbaneAustralia

Section editors and affiliations

  • Timos Sellis
    • 1
  • Aamir Cheema
    • 1
  1. 1.Data Science Research InstituteSwinburne University of TechnologyMelbourneAustralia