John Snow’s Famous Cholera Map

Sep 12, 2007

John Snow Cholera MapIf you’ve read any books on visualization, without a doubt, you’ve seen John Snow’s now famous cholera map. In 1854, people were dying in large numbers and high frequency, but nobody knew what was going on. John Snow solved the mystery with his map.

It’s crazy to imagine a time when people didn’t think to map data, especially now as mapping data has become second nature for some. Steven Johnson, author of Ghost Map, goes into depth on the Cholera outbreak in London in his book and TED talk earlier this year.

I’d embed it, but I can’t find the link anywhere on the TED page. They probably had to make it less obvious after Hans Rosling’s talk spread at the speed of Cholera in London in 1854. London hasn’t had another outbreak since Snow’s simple (for this day and age) but effective visualization.

UPDATE: Here’s Steven Johnson’s TED talk

3 Comments

Favorites

Reviving the Statistical Atlas of the United States with New Data

Due to budget cuts, there is no plan for an updated atlas. So I recreated the original 1870 Atlas using today’s publicly available data.

The Changing American Diet

See what we ate on an average day, for the past several decades.

Divorce and Occupation

Some jobs tend towards higher divorce rates. Some towards lower. Salary also probably plays a role.

10 Best Data Visualization Projects of 2015

These are my picks for the best of 2015. As usual, they could easily appear in a different order on a different day, and there are projects not on the list that were also excellent.