ek location history of two people, collected with Google Timeline." width="100%" />
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Figure 6.5: Four-week location history of two people, collected with Google Timeline.
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<p>Data-points are superposed, using transparent colors, to make a distinction between locations that were visited once (light areas) and places that were visited many times (darker areas). From the plot, we learn that these two people both lived and worked in the Amsterdam area (latitude and longitude are cl