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How to create a multi-color choropleth map.


Published: 13 Feb 2015
Last Modified Date: 06 Mar 2017

Question

How does one create a filled map that is colored by a measure and a dimension?

Environment

Tableau Desktop

Answer

In dual axis maps, each of the two axis' marks can be set separately.  This allows for a variety of layering of information.  The most effective of which seems to be a choropleth, or filled, map that is colored by some region dimension.

 

Using the Sample - World Bank Indicators data source.

 

Step 1: Create Our Region Map

 

  1. Ctrl + Click on Country / Region and Region.
  1. Use Show me to create a filled map.
  2. Drag Region from the row shelf to the color portion of the marks card.

 

Step 2: Shade our map by some measure

 

  1. Hold down ctrl and drag Latitude (generated) from the row shelf onto the row shelf.

 

Note: the marks card now has more options for each of our two maps.

Dual Axis Marks Card.

 

  1. Click on the bottom Latitude (generated) on the marks card.
  2. Drag your measure of choice onto the color tab of the bottom Latitude (generated) marks card. In this example: G: Legal rights (0 = weak)
  3. Click on the color part of the bottom Latitude (generated) marks card, and click Edit Colors...
  1. Select Gray from the Palette dropdown.
  1. Click Ok.

 

Step 2: Combine the two maps

 

  1. Right click on the second Latitude (generated) pill on the row shelf.
  1. Select Dual Axis.
  1. Click on the color part of the bottom Latitude (generated) marks card.
  2. Play with transparency to get the right balance of color and shading.

 

Step 3: Enjoy!

 

  1. Bask in shaded colorfulness!

 

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