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Flow maps are another kind of way to visualize your data. Maybe the most famous flow map is this one from Charles Joseph Minard in 1869. Tufte always touts this one as being the "best statistical chart ever made".
A quick 🧵 on the Minard map.
A quick 🧵 on the Minard map.
The famous Minard map shows 6 data values in a single view:
1. Number of troops (line thickness)
2. Distance traveled (scale)
3. Temperature (line at bottom)
4. Time (line at bottom)
5. Direction of travel (color)
6. Geography (cities, etc.)
1. Number of troops (line thickness)
2. Distance traveled (scale)
3. Temperature (line at bottom)
4. Time (line at bottom)
5. Direction of travel (color)
6. Geography (cities, etc.)
But Tufte left out the fact that the Minard Napolean map was only one panel in a full spread. It also included the lesser-known map of Hannibal’s 218 BC march through the Alps to Rome. (This image from Ecole nationale des ponts et chaussées, which I include in my book.)
