Creating a Dual Axis Map in Tableau

I was given a challenge by a student recently. They wanted to color territories on their map by a region, but they wanted the intensity of the color to represent the amount of sales that occurred in an individual territory.

Essentially they wanted to create this:

17-1.png

The primary question was, how do you get there?

 

Overlaying Two Maps

We’ll start with a map that just has region on color:

17-2.png

From there, we’ll create a duplicate of “Latitude” and drop it next to Latitude on rows (Hint: use CTRL + drag to create a copy of a field that’s already being used in your worksheet).

17-3.png

Select the second label of “Latitude” in the Marks Card, drop “Sales” on color, and set the color scheme to sequential going from white to black.

17-4.png

Drop the opacity of the map down to around 50% so the black looks more like dark gray.

17-5.png

Right-click on the second “Latitude” on Rows and select “Dual Axis”.

17-6.png

At this point, you should have a beautiful map that is colored by both a dimension and a measure.

17-7.png

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