Integrating people and place: A density-based measure for assessing accessibility to opportunities
Mark W. Horner,Joni A. Downs +1 more
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The goal here is to understand the magnitude and nature of the opportunities a mobile object had access to, given known location points and a time budget for its movement.Abstract:
Mobile object analysis is a well-studied area of transportation and geographic information science (GIScience). Mobile objects may include people, animals, or vehicles. Time geography remains a key theoretical framework for understanding mobile objects' movement possibilities. Recent efforts have sought to develop probabilistic methods of time geography by exploring questions of data uncertainty, spatial representation, and other limitations of classical approaches. Along these lines, work has blended time geography and kernel density estimation in order to delineate the probable locations of mobile objects in both continuous and discrete network space. This suite of techniques is known as time geographic density estimation (TGDE). The present paper explores a new direction for TGDE, namely the creation of a density-based accessibility measure for assessing mobile objects' potential for interacting with opportunity locations. As accessibility measures have also garnered widespread attention in the literature, the goal here is to understand the magnitude and nature of the opportunities a mobile object had access to, given known location points and a time budget for its movement. New accessibility measures are formulated and demonstrated with synthetic trip diary data. The implications of the new measures are discussed in the context of people-based vs. placed-based accessibility analyses.read more
Citations
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Capturing individuals' food environments using flexible space-time accessibility measures
Mark W. Horner,Brittany S. Wood +1 more
TL;DR: Results show that individual and place-based differences in food accessibility may be delineated with the metrics, and possible ‘deserts’ or areas of inaccessibility may be identified through a bottom-up analysis of the travel and mobility experience of a representative sample of individuals.
Journal ArticleDOI
Do aging populations have differential accessibility to activities? Analyzing the spatial structure of social, professional, and business opportunities
TL;DR: In this paper, the authors investigated the accessibility of the older population to potential activities in a smaller metropolitan area in the state of Florida, using highly disaggregate spatial data containing the locations of populations and possible activities, and implemented accessibility models in a Geographic Information Systems (GIS) environment.
Journal ArticleDOI
Measuring the accessibility and spatial equity of urban services under competition using the cumulative opportunities measure
TL;DR: In this article, the authors highlight the impact of addressing competition for different urban services in the cumulative opportunities measure and show that considering competition changes the spatial patterns of accessibility and its equity.
Journal ArticleDOI
Job accessibility and employment outcomes: which income groups benefit the most?
TL;DR: In this paper, the authors examined six income groups in the Los Angeles metropolitan area and found that job accessibility affects the employment status of medium-to-low income groups (household income between US$25,000 and US$75,000).
Journal ArticleDOI
Measuring temporal variation of location-based accessibility using space-time utility perspective
Yafei Wang,Yafei Wang,Bi Yu Chen,Bi Yu Chen,Hui Yuan,Donggen Wang,William H. K. Lam,Qingquan Li +7 more
TL;DR: The results of the case study show that the proposed location-based space-time accessibility measures can well capture the temporal variation of accessibility, due to the dynamics both of traffic conditions and of individuals' intensities in performing activities at different times of day.
References
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Book ChapterDOI
Examining the Spatial and Social Variation in Employment Accessibility: A Case Study of Bus Transit in Austin, Texas
Mark W. Horner,Jessica N Mefford +1 more
TL;DR: In this article, the authors examined how an urban bus transit system provides accessibility to residents through a case study of bus service in Austin, Texas and developed several GIS-based measures of accessibility and uses them to explore the landscape of transit service provision.
Journal ArticleDOI
Route Choice Efficiency: An Investigation of Home-To-Work Trips Using GPS Data
Dominik Papinski,Darren M. Scott +1 more
TL;DR: A new way to study commuting efficiency based on the degree to which actual routes between places deviate from shortest paths is proposed, which indicates that many drivers pursue suboptimal routes.
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