Toward a kinetic-based probabilistic time geography

Jed A. Long, Trisalyn A. Nelson, Farouk S. Nathoo

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Time geography represents a powerful framework for the quantitative analysis of individual movement. Time geography effectively delineates the space-time boundaries of possible individual movement by characterizing movement constraints. The goal of this paper is to synchronize two new ideas, probabilistic time geography and kinetic-based time geography, to develop a more realistic set of movement constraints that consider movement probabilities related to object kinetics. Using random-walk theory, the existing probabilistic time geography model characterizes movement probabilities for the space-time cone using a normal distribution. The normal distribution has a symmetric probability density function and is an appropriate model in the absence of skewness - which we relate to an object's initial velocity. Moving away from a symmetric distribution for movement probabilities, we propose the use of the skew-normal distribution to model kinetic-based movement probabilities, where the degree and direction of skewness is related to movement direction and speed. Following a description of our model, we use a set of case-studies to demonstrate the skew-normal model: a random walk, a correlated random walk, wildlife data, cyclist data, and athlete movement data. Our results show that for objects characterized by random movement behavior, the existing model performs well, but for object movement with kinetic properties (e.g., athletes), the proposed model provides a substantial improvement. Future work will look to extend the proposed probabilistic framework to the space-time prism.

Original languageEnglish (US)
Pages (from-to)855-874
Number of pages20
JournalInternational Journal of Geographical Information Science
Volume28
Issue number5
DOIs
StatePublished - May 2014
Externally publishedYes

Keywords

  • kinetics
  • mobile objects
  • personal movement models
  • probability
  • time geography

ASJC Scopus subject areas

  • Information Systems
  • Geography, Planning and Development
  • Library and Information Sciences

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