Space-time accessibility measures: A geocomputational algorithm with a focus on the feasible opportunity set and possible activity duration |
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Authors: | Hyun-Mi Kim Mei-Po Kwan |
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Institution: | (1) Department of Geography, 1036 Derby Hall, 154 North Oval Mall, The Ohio State University, Columbus, OH 43210-1361, USA Tel.: 614-292-2704; Fax: 614-292-6213 (e-mails: kim.1038@osu.edu; Kwan.8@osu.edu), US |
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Abstract: | Space-time accessibility measures have received much attention in recent years due to their sensitivity to differences in
individual ability to participate in activities in space and time. Despite the conceptual attractiveness and robustness of
space-time measures, only few attempts have been made to operationalize them to date. Research that seeks to improve space-time
accessibility measures is still sorely needed. This study seeks to enhance space-time accessibility measures through developing
a new operational method and GIS-based algorithm that better represents the space-time characteristics of urban opportunities
(e.g. their geographical distribution and opening hours) and human activity-travel behavior (e.g. delay times, minimum activity
participation time, and maximum travel time threshold). The proposed method not only takes into account the number and size
of opportunities, but also the possible activity duration at each activity location given its opening hours and the effect
of transport network topology (e.g. one-way streets, turn restrictions and over-pass). Incorporating these elements into space-time
measures helps overcome several shortcomings of previous approaches to evaluating space-time accessibility.
Received: 15 September 2002 / Accepted: 10 February 2003
A version of this paper was presented at the 98th Annual Meeting of the Association of American Geographers, Los Angeles,
March 19-23, 2002. We thank Joe Weber for providing the digital transport network with travel speeds and a version of the
geocomputational algorithm he used in his study (Weber 2001), upon which our developmental effort has been based. We are also
grateful to the helpful comments and suggestions of the reviewers. |
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Keywords: | : Individual accessibility space-time accessibility measures space-time constraint space-time prism GIS |
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