The challenge of obtaining ground truth for GPS processing

Peter R. Stopher, Li Shen, Wen Liu, Asif Ahmed

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The increasing use of GPS as a source of travel survey data has brought with it an increasing need for a reliable source of ground truth. Recently, the main source that has been used for providing ground truth is the prompted recall survey. However, the prompted recall survey is subject to many of the same shortcomings as most self-administered surveys. In this paper, we review some of the common problems encountered in prompted recall surveys. Following this, we describe a recent experiment in using life-logging cameras to record a person's travel, together with GPS, thereby providing a new source of ground truth data.

Original languageEnglish (US)
Pages (from-to)206-217
Number of pages12
JournalTransportation Research Procedia
StatePublished - 2015
Externally publishedYes


  • GPS Processing
  • GPS Surveys
  • Ground Truth
  • Life-logging cameras
  • Prompted Recall Survey

ASJC Scopus subject areas

  • Transportation


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