Although we tend to think of maps as images fixed in time, modern cartography has sought to represent events that are dynamic and not in equilibrium. This map uses location information taken from more than 150,000 cell-phones to show population movement of individuals in West Africa to help predict possible routes for the spread of Ebola during the epidemic of 2014. It is a typical example of how modern cartography has expanded its boundaries to map not only geographic but also social phenomena.
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