page 39) argues that contemporary networked cities arè`constituted by flows of people, vehicles, and information'', and yet data about these flows are increasingly difficult to collect and analyse using traditional social science research methods (Shoval, 2007, page 194). The underlying issue, identified by Batty (1990), is that the corporate… (More)
Do regional boundaries defined by governments respect the more natural ways that people interact across space? This paper proposes a novel, fine-grained approach to regional delineation, based on analyzing networks of billions of individual human transactions. Given a geographical area and some measure of the strength of links between its inhabitants, we… (More)
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M uch of our understanding of urban systems comes from traditional data collection methods such as surveys by person or phone. These approaches can provide detailed information about urban behaviors , but they're hard to update and might limit results to " snapshots in time. " In the past few years, some innovative approaches have sought to use mobile… (More)