How Th­ese Maps Were Made

Bloomberg Businessweek (Asia) - - FOCUS/SMALL BUSINESS -

Ama­zon pro­vides a web­site for users to find out if Prime Free Same-Day De­liv­ery is avail­able to them. Bloomberg ran ev­ery U.S. ZIP code through the tool to pro­duce a com­plete na­tional cov­er­age map of the ser­vice, which was then over­laid on pop­u­la­tion data from the U.S. Cen­sus Bureau’s 2014 Amer­i­can Com­mu­nity Sur­vey. That data is mapped at the block level, and on the maps, pop­u­la­tion dots are shown evenly dis­trib­uted across each block. Pop­u­la­tion in a block group that over­laps mul­ti­ple ZIP codes is pro­por­tion­ally dis­trib­uted based on the area of over­lap. For more, go to graph­ics/2016-ama­zon-same-day/

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