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
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Mapping sex offender activity spaces relative to crime using time-geographic methods
TL;DR: Time-geographic density estimation (TGDE) is used to estimate individual activity spaces using potential path areas that have associated probability densities and areas of a city that are more frequented by offenders and, accordingly, expected to support higher crime rates are mapped.
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The suburbanization of poverty and changes in access to public transportation in the Triangle Region, NC
Chang Liu,Eleni Bardaka +1 more
TL;DR: This article investigated the relationship between poverty and transit access at the neighborhood level and how it varies spatially and temporally, while accounting for unobserved heterogeneity and spatial autocorrelation.
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Aging in activity spaces: how does individual accessibility compare across age cohorts?
Brittany S. Wood,Mark W. Horner +1 more
TL;DR: This study uses travel diary data on automobile trips to construct activity spaces to explore whether or not travel patterns across age groups result in differential access to particular goods and services in the Orlando Metropolitan Statistical Area (MSA).
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Modeling Transport Accessibility with Open Data: Case Study of St. Petersburg
TL;DR: The aim of the study is to find the critical deficiencies in transport infrastructure and predict transport accessibility under changes of infrastructure and city growth, and to be the basis for optimization of public transport routes, schedules and periods of repairs.
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Using Potential Path Trees to Map Sex Offender Access to Schools
TL;DR: In this paper, the authors explored the spatial accessibility of sex offenders to public schools in a city with enforced residence restrictions, St. Louis, Missouri, and found that, while few registered sex offenders in the city live near schools, nearly all are expected to come in close proximity to them either near the work place or during the expected journey to work.
References
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BookDOI
Density estimation for statistics and data analysis
TL;DR: The Kernel Method for Multivariate Data: Three Important Methods and Density Estimation in Action.
Journal ArticleDOI
How Accessibility Shapes Land Use
TL;DR: In this article, an empirical analysis of the residential development patterns illustrates that accessibility and the availability of vacant developable land can be used as the basis of a residential land use model.
Journal ArticleDOI
Measuring accessibility: an exploration of issues and alternatives
Susan L Handy,Debbie A. Niemeier +1 more
TL;DR: In this article, the authors provide a framework for the development of accessibility measures and two case studies suggestive of the range of possible approaches are presented, as well as issues that planners must address in developing an accessibility measure.
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