John Snow's Cholera Map, London 1854

This map (published by Simon Liu from Esri UK) is based on John Snow's map of deaths caused by cholera during the summer of 1854 in Soho, London, showing that most deaths occurred near a contaminated water pump on Broad Street (now Broadwick Street). Death locations are represented by points, which are colour-coded based on which pump is the nearest. John Snow's original map is now in the public domain. Digitised location data was also used from the following source: http://www.ncgia.ucsb.edu/pubs/snow/snow.html



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