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. 2009 Apr 24;9(4):3033–3055. doi: 10.3390/s90403033

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© 2009 by the authors; licensee MDPI, Basel, Switzerland

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 3. — Principle of deployment of GPS devices in the Spatial Metro case. Each trip contains the complete, walked pattern of that day for one participant and is delimited by leaving the car park (location A or B) and returning to it.