Optimal match method for milepoint postprocessing of track condition data from subway track geometry cars

Peng Xu, Quanxin Sun, Rengkui Liu, Reginald R. Souleyrette

Research output: Contribution to journalArticlepeer-review

11 Citations (SciVal)


Precise milepoint measurement data are essential for better subway track management and maintenance practices within railroads and subways. For milepoint estimation, dead reckoning systems of some subway track geometry cars use as pesudolite markers having no unique identification information. In such cases, milepoint measurement data have to be postprocessed. However, the postprocessing is conducted in a manual fashion and is time consuming and labor intensive. This paper presents an optimal match method to automatically postprocess milepoint measurement data. The presented method consists of three submodels: (1) dynamic-programming-based distributionpattern match model for differentiating actual markers from false-positive ones, (2) correlation-analysis-based algorithm determining milepoints for recognized markers, and (3) a linear interpolation equation for milepoint revision. The method was applied to 124 inspection runs for 15 tracks of the Beijing subway system whose track geometry car is such a case. It is shown that the developed method outperforms the manual method in milepoint accuracy. It takes the developed method less than 3 min to complete milepoint revision for an inspection run of the longest track in Beijing subways.

Original languageEnglish
Pages (from-to)4016028
Number of pages1
JournalJournal of Transportation Engineering
Issue number8
StatePublished - Aug 1 2016

Bibliographical note

Publisher Copyright:
© 2016 American Society of Civil Engineers.


  • Cross-correlation
  • Distance-based distribution pattern match
  • Dynamic programming
  • Milepoint postprocessing
  • Subway
  • Track geometry car

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Transportation


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