John Snow's Map 1 (1854) Famous depiction of London cholera outbreak and possible cause.

John Snow's Map 1 (1854) Famous depiction of London cholera outbreak and possible cause.

John Snow's famous Cholera Map from 1854, updated to show off CartoDB's cloud based mapping tool.

John Snow's famous Cholera Map from 1854, updated to show off CartoDB's cloud based mapping tool.

John Snow’s Cholera Map using GIS Data - GIS Lounge

John Snow’s Cholera Map using GIS Data - GIS Lounge

The 200th anniversary of John Snow’s birth on 15th March 2013 provides an occasion to celebrate Snow’s achievements -  best known for his work on cholera, for a famous map, and for organizing the removal of a pump handle on Broad Street on 8th September 1854.

The 200th anniversary of John Snow’s birth on 15th March 2013 provides an occasion to celebrate Snow’s achievements - best known for his work on cholera, for a famous map, and for organizing the removal of a pump handle on Broad Street on 8th September 1854.

This was the overview map of John Snow's study on Cholera epidemic. He visited each households to test if the water has been contaminated with Cholera.

This was the overview map of John Snow's study on Cholera epidemic. He visited each households to test if the water has been contaminated with Cholera.

Robin painstakingly georeferenced every cholera death and pump location, so we could recreate the map on a modern layout of London. We wondered what would happen if we tried to recreate the map using a modern tool, opting to try CartoDB, using the the lovely Stamen 'toner' projection to at least keep the background in common with Snow's London.

Robin painstakingly georeferenced every cholera death and pump location, so we could recreate the map on a modern layout of London. We wondered what would happen if we tried to recreate the map using a modern tool, opting to try CartoDB, using the the lovely Stamen 'toner' projection to at least keep the background in common with Snow's London.

Original map made by John Snow in 1854. Cholera cases are highlighted in black.

Original map made by John Snow in 1854. Cholera cases are highlighted in black.

John Snow was one of the first epidemiologists in the 1800s. He mapped out the cases of the cholera outbreak in London to find the cause and recurrence by investigating the people infected.

John Snow was one of the first epidemiologists in the 1800s. He mapped out the cases of the cholera outbreak in London to find the cause and recurrence by investigating the people infected.

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