MAPS WITH PIE CHARTS
Since maps use the horizontal and vertical position to encode geographic locations, you have fewer options to encode data values than with other chart types. However, there are ways to add more information to maps. One popular option is the pie chart map. This is a variant of the symbol map that allows you to show proportions of a nongeographic dimension.
These kinds of maps can quickly become overloaded with marks. If that happens, it can be worthwhile to try a filter to show only the most important marks. If you need to add another field to the view, you can also combine a pie chart map with a filled map via the Dual Axis feature.
Creating a Pie Chart Map
Start by creating a simple symbol map: double‐click City, State, and Country. Then double‐click the Sales measure to add it to Size.
In the mark type menu on the Marks card, change the type to Pie. Finally, move Category to Color. This breaks the pies into different‐sized wedges—see...
