Analyzing collective accessibility using average space-time prisms

The space-time prism (STP) is the envelope of all possible travel paths in space and time between two anchor locations and times, measuring accessibility for an individual given a designated travel and activity episode. Although the STP provides a powerful measure of individual accessibility, transportation researchers often need to analyze accessibility at collective-levels for planning and policy analysis. Deriving a representative STP of a set of individual STPs would provide a general idea of how collective members’ accessibility is performing. However, there is no analytical time geographic method to calculate a collective-level representative STP that is consistent with individual STPs. To fill this gap, this research develops the concept of average space-time prism (ASTP). The ASTP is a representative STP of a group of individual STPs with respect to size, shape, and location. The authors develop methods for calculating an ASTP using analytical time geography and elliptic Fourier shape analysis techniques. The ASTP provides a geometric and visual summary of collective accessibility: it can be used to generate representative STPs for aggregate geographic units such as neighborhoods and cities based on individual-level data. A possible application of the ASTP is the spatial equity analysis of accessibility. The ASTP can be located at individuals’ anchor locations and overlaid with opportunities, enabling in-situ comparisons between individual versus collective accessibility and accessibility equity analysis considering geographic contexts. The authors illustrate this ASTP’s capability when measuring the impacts of new transit service on healthcare access equity in a neighborhood in Columbus, Ohio, USA.

• Record URL:
  • https://doi.org/10.1016/j.trd.2019.02.004
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S1361920918310630
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/13619209
• Supplemental Notes:
  • © 2019 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Lee, Jinhyung
  • 0000-0003-1859-3441
  • Miller, Harvey J
• Publication Date: 2019-4

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: pp 250-264
• Serial:
  • Transportation Research Part D: Transport and Environment
  • Volume: 69
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 1361-9209
  • Serial URL: http://www.sciencedirect.com/science/journal/13619209

Subject/Index Terms

• TRT Terms: Accessibility; Equity; Health care; Public transit; Spatial analysis; Time
• Uncontrolled Terms: Collective behavior
• Geographic Terms: Columbus (Ohio)
• Subject Areas: Planning and Forecasting; Public Transportation; Society;

Filing Info

• Accession Number: 01696076
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 26 2019 9:38AM