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US Voting Data

In this video tutorial we take a look at using US election data and producing a value by alpha map (like a choropleth map but with a smoother colour scheme). It's a nice effect and a good addition to your cartoolkit (cartography toolkit... )

This recipe is taken from the awesome book, QGIS Map Design by Anita Graser and Gretchen Peterson. You can pick up a hard copy of the book here:

The e-book version is available from Locate Press.


If you'd like to test yourself why not try expanding this beyond Minnesota to all US counties? It might also be interesting to use a colour ramp instead of value by alpha. Could you use only colour channels to indicate if the result was close for each county?

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