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TIME-BASED VS. DISTANCE-BASED SAMPLING IN PROBE VEHICLE DATA: IMPLICATIONS FOR TRAVEL TIME ESTIMATION
KTH, School of Architecture and the Built Environment (ABE), Centres, Centre for Transport Studies, CTS.ORCID iD: 0000-0002-4106-3126
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Transport Planning, Economics and Engineering.
2012 (English)In: TRANSPORTATION & LOGISTICS MANAGEMENT / [ed] Mak, HY Lo, HK, HONG KONG SOC TRANSPORTATION STUDIES LTD , 2012, p. 185-192Conference paper, Published paper (Refereed)
Abstract [en]

This paper analyses the role of the sampling protocol for travel time estimation with low frequency probe vehicle data by likelihood-based methods, such as maximum likelihood or Bayesian estimation. In the literature, there are reported cases where the vehicle positions are sampled at either certain time intervals, say, every minute, or at certain distance intervals, say, every 500 meters. We show that whether sampling is distance-based or time-based determines the proper formulation of the likelihood function. Furthermore, an incorrect likelihood formulation (for example, treating sampling as distance-based when it is time-based in actuality) often leads to biased parameter estimates. For the special case in which the path is partitioned into segments with constant, independent travel speeds we derive explicit formulas for the likelihood function for each of the two sampling principles. We also study the consistency and bias of the estimators in numerical experiments.

Place, publisher, year, edition, pages
HONG KONG SOC TRANSPORTATION STUDIES LTD , 2012. p. 185-192
Keywords [en]
travel time, estimation, sampling, GPS, probe
National Category
Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-245340ISI: 000367757500022Scopus ID: 2-s2.0-84896871412OAI: oai:DiVA.org:kth-245340DiVA, id: diva2:1294742
Conference
17th International Conference of Hong-Kong-Society-for-Transportation-Studies (HKSTS)
Note

QC 20190308

Available from: 2019-03-08 Created: 2019-03-08 Last updated: 2019-08-21Bibliographically approved

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Jenelius, ErikKoutsopoulos, Haris N.

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf