Introducing spatial availability, a singly-constrained measure of competitive accessibility.
Accessibility indicators are widely used in transportation, urban and healthcare planning, among many other applications. These measures are weighted sums of reachable opportunities from a given origin, conditional on the cost of movement, and are estimates of the potential for spatial interaction....
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2023-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0278468 |
| _version_ | 1797942875084816384 |
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| author | Anastasia Soukhov Antonio Páez Christopher D Higgins Moataz Mohamed |
| author_facet | Anastasia Soukhov Antonio Páez Christopher D Higgins Moataz Mohamed |
| author_sort | Anastasia Soukhov |
| collection | DOAJ |
| description | Accessibility indicators are widely used in transportation, urban and healthcare planning, among many other applications. These measures are weighted sums of reachable opportunities from a given origin, conditional on the cost of movement, and are estimates of the potential for spatial interaction. Over time, various proposals have been forwarded to improve their interpretability: one of those methodological additions have been the introduction of competition. In this paper we focus on competition, but first demonstrate how a widely used measure of accessibility with congestion fails to properly match the opportunity-seeking population. We then propose an alternative formulation of accessibility with competition, a measure we call spatial availability. This measure relies on proportional allocation balancing factors (friction of distance and population competition) that are equivalent to imposing a single constraint on conventional gravity-based accessibility. In other words, the proportional allocation of opportunities results in a spatially available opportunities value which is assigned to each origin that, when all origin values are summed, equals the total number of opportunities in the region. We also demonstrate how Two-Stage Floating Catchment Area (2SFCA) methods are equivalent to spatial availability and can be reconceptualized as singly-constrained accessibility. To illustrate the application of spatial availability and compare it to other relevant measures, we use data from the 2016 Transportation Tomorrow Survey of the Greater Golden Horseshoe area in southern Ontario, Canada. Spatial availability is an important contribution since it clarifies the interpretation of accessibility with competition and paves the way for future applications in equity analysis (e.g., spatial mismatch, opportunity benchmarking, policy intervention scenario analysis). |
| first_indexed | 2024-04-10T20:15:32Z |
| format | Article |
| id | doaj.art-6104c8015db741fe95720be7bd49e8ec |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-10T20:15:32Z |
| publishDate | 2023-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-6104c8015db741fe95720be7bd49e8ec2023-01-26T05:32:14ZengPublic Library of Science (PLoS)PLoS ONE1932-62032023-01-01181e027846810.1371/journal.pone.0278468Introducing spatial availability, a singly-constrained measure of competitive accessibility.Anastasia SoukhovAntonio PáezChristopher D HigginsMoataz MohamedAccessibility indicators are widely used in transportation, urban and healthcare planning, among many other applications. These measures are weighted sums of reachable opportunities from a given origin, conditional on the cost of movement, and are estimates of the potential for spatial interaction. Over time, various proposals have been forwarded to improve their interpretability: one of those methodological additions have been the introduction of competition. In this paper we focus on competition, but first demonstrate how a widely used measure of accessibility with congestion fails to properly match the opportunity-seeking population. We then propose an alternative formulation of accessibility with competition, a measure we call spatial availability. This measure relies on proportional allocation balancing factors (friction of distance and population competition) that are equivalent to imposing a single constraint on conventional gravity-based accessibility. In other words, the proportional allocation of opportunities results in a spatially available opportunities value which is assigned to each origin that, when all origin values are summed, equals the total number of opportunities in the region. We also demonstrate how Two-Stage Floating Catchment Area (2SFCA) methods are equivalent to spatial availability and can be reconceptualized as singly-constrained accessibility. To illustrate the application of spatial availability and compare it to other relevant measures, we use data from the 2016 Transportation Tomorrow Survey of the Greater Golden Horseshoe area in southern Ontario, Canada. Spatial availability is an important contribution since it clarifies the interpretation of accessibility with competition and paves the way for future applications in equity analysis (e.g., spatial mismatch, opportunity benchmarking, policy intervention scenario analysis).https://doi.org/10.1371/journal.pone.0278468 |
| spellingShingle | Anastasia Soukhov Antonio Páez Christopher D Higgins Moataz Mohamed Introducing spatial availability, a singly-constrained measure of competitive accessibility. PLoS ONE |
| title | Introducing spatial availability, a singly-constrained measure of competitive accessibility. |
| title_full | Introducing spatial availability, a singly-constrained measure of competitive accessibility. |
| title_fullStr | Introducing spatial availability, a singly-constrained measure of competitive accessibility. |
| title_full_unstemmed | Introducing spatial availability, a singly-constrained measure of competitive accessibility. |
| title_short | Introducing spatial availability, a singly-constrained measure of competitive accessibility. |
| title_sort | introducing spatial availability a singly constrained measure of competitive accessibility |
| url | https://doi.org/10.1371/journal.pone.0278468 |
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