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Trivariate Choropleth

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#1
bZ27

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I am in the process of constructing an un-classed, trivariate choropleth map of Africa. By utilizing the RGB spectrum, variable “A” receives a Red value (0-255 in Illustrator), “B” a Blue value, and “C” a Green value. The resulting values give each country a unique color. Everything was going smoothly until I tried to build a legend.

I understand a single un-classed variable is represented by a line,

An un-classed bivariate is represented by a square,

But if I’m not interested in going interactive, how can I show an un-classed trivariate legend on paper?

#2
Hans van der Maarel

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But if I’m not interested in going interactive, how can I show an un-classed trivariate legend on paper?


Equilateral Triangle, map one of your variables along each of its sides. I think I have a textbook showing a sample around here somewhere.
Hans van der Maarel - Cartotalk Editor
Red Geographics
Email: hans@redgeographics.com / Twitter: @redgeographics

#3
frax

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I'd be curious to see what this map looks like - I can't help to be quite sceptical to the communication/interpretation of such a map, but it sounds interesting!
Hugo Ahlenius
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