Temporal sampling and service frequency harmonics in transit accessibility evaluation
In the context of public transit networks, repeated calculation of accessibility at multiple departure times provides a more robust representation of local accessibility. However, these calculations can require significant amounts of time and/or computing power. One way to reduce these requirements...
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| Format: | Article |
| Language: | English |
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University of Minnesota Libraries Publishing
2019-12-01
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| Series: | Journal of Transport and Land Use |
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| Online Access: | https://www.jtlu.org/index.php/jtlu/article/view/1379 |
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| author | Andrew Owen Brendan Murphy |
| author_facet | Andrew Owen Brendan Murphy |
| author_sort | Andrew Owen |
| collection | DOAJ |
| description | In the context of public transit networks, repeated calculation of accessibility at multiple departure times provides a more robust representation of local accessibility. However, these calculations can require significant amounts of time and/or computing power. One way to reduce these requirements is to calculate accessibility only for a sample of time points over a time window of interest, rather than every one. To date, many accessibility evaluation projects have employed temporal sampling strategies, but the effects of different strategies have not been investigated and their performance has not been compared. Using detailed block-level accessibility calculated at 1-minute intervals as a reference dataset, four different temporal sampling strategies are evaluated using aggregate sample error metrics as well as indicators of spatially clustered error. Systematic sampling at a regular interval performs well on average but is susceptible to spatially-clustered harmonic error effects which may bias aggregate accessibility results. A constrained random walk sampling strategy provides slightly worse average sample error, but eliminates the risk of harmonic error effects. |
| format | Article |
| id | doaj-art-1f97b980168443b696eb22a3a8a6cd90 |
| institution | OA Journals |
| issn | 1938-7849 |
| language | English |
| publishDate | 2019-12-01 |
| publisher | University of Minnesota Libraries Publishing |
| record_format | Article |
| series | Journal of Transport and Land Use |
| spelling | doaj-art-1f97b980168443b696eb22a3a8a6cd902025-08-20T02:04:14ZengUniversity of Minnesota Libraries PublishingJournal of Transport and Land Use1938-78492019-12-01121Temporal sampling and service frequency harmonics in transit accessibility evaluationAndrew Owen0Brendan Murphy1Accessibility Observatory University of Minnesota Center for Transportation StudiesAccessibility Observatory University of Minnesota Center for Transportation StudiesIn the context of public transit networks, repeated calculation of accessibility at multiple departure times provides a more robust representation of local accessibility. However, these calculations can require significant amounts of time and/or computing power. One way to reduce these requirements is to calculate accessibility only for a sample of time points over a time window of interest, rather than every one. To date, many accessibility evaluation projects have employed temporal sampling strategies, but the effects of different strategies have not been investigated and their performance has not been compared. Using detailed block-level accessibility calculated at 1-minute intervals as a reference dataset, four different temporal sampling strategies are evaluated using aggregate sample error metrics as well as indicators of spatially clustered error. Systematic sampling at a regular interval performs well on average but is susceptible to spatially-clustered harmonic error effects which may bias aggregate accessibility results. A constrained random walk sampling strategy provides slightly worse average sample error, but eliminates the risk of harmonic error effects.https://www.jtlu.org/index.php/jtlu/article/view/1379transit accessibilitytemporal samplingspatial analytics |
| spellingShingle | Andrew Owen Brendan Murphy Temporal sampling and service frequency harmonics in transit accessibility evaluation Journal of Transport and Land Use transit accessibility temporal sampling spatial analytics |
| title | Temporal sampling and service frequency harmonics in transit accessibility evaluation |
| title_full | Temporal sampling and service frequency harmonics in transit accessibility evaluation |
| title_fullStr | Temporal sampling and service frequency harmonics in transit accessibility evaluation |
| title_full_unstemmed | Temporal sampling and service frequency harmonics in transit accessibility evaluation |
| title_short | Temporal sampling and service frequency harmonics in transit accessibility evaluation |
| title_sort | temporal sampling and service frequency harmonics in transit accessibility evaluation |
| topic | transit accessibility temporal sampling spatial analytics |
| url | https://www.jtlu.org/index.php/jtlu/article/view/1379 |
| work_keys_str_mv | AT andrewowen temporalsamplingandservicefrequencyharmonicsintransitaccessibilityevaluation AT brendanmurphy temporalsamplingandservicefrequencyharmonicsintransitaccessibilityevaluation |