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Figure 1 | International Journal of Health Geographics

Figure 1

From: Examining the spatial congruence between data obtained with a novel activity location questionnaire, continuous GPS tracking, and prompted recall surveys

Figure 1

Comparison of convex hull sizes and description of overlaps: questionnaire and GPS track convex hulls in data collected in Montreal, Canada in 2011. The questionnaire convex hull (in yellow) and GPS track convex hull (in blue) overlap so that the overlapping area is 100% the size of the questionnaire convex hull, and 12% the size of the GPS track convex hull.

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