The Challenge of Obtaining Ground Truth for GPS Processing

Peter Stopher · Li Shen · Asif Ahmed

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Human Mobility and Location-Based Analysis Transportation Planning and Optimization Survey Methodology and Nonresponse

Abstract

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.

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2013Transportation mode recognition using GPS and accelerometer data 2011Can we use digital life-log images to investigate active and sedentary travel behaviour? Results from a pilot study 2010Semiautomatic Imputation of Activity Travel Diaries 2011Global Positioning System–Assisted Prompted Recall Household Travel Survey to Support Development of Advanced Travel Model in Jerusalem, Israel 2011In-Depth Comparison of Global Positioning System and Diary Records 2001Prompted Recall in Global Positioning System Survey: Proof-of-Concept Study

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