This is John Snow’s 1854 map of the Broad Street (now Broadwick Street) cholera outbreak. Widely cited as the one of the first (and arguably best) examples of using spatial analysis in epidemiological studies, Snow’s map holds a special place in the hearts of those using spatial analysis to improve people’s lives. #Medicine #NotGoT #Map #Skills
John Snow's "Death Map". From the 1854 cholera breakout in London. Dr. John Snow plotted occurrences of cholera on a map of Soho in London during an outbreak in 1854. A particularly high concentration of deaths, marked by dots, around a pump on Broad Street led him to propose it as the source of the outbreak. The pump was disabled and the epidemic subsided. This confirmed his hypothesis that cholera was water-borne. John Snow, On the mode of communication of cholera. London, 1855.