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Quick and Dirty Thematic Mapmaking for Everyone

A thematic map (wiki link) is a map that illustrates a particular theme.  Most of the "informative" maps we see are thematic maps: weather maps, maps of political results, maps of bicycle paths, etc.

example of a choroplethIn this article, we'll take a step-by-step look at how to make a thematic map  - a choropleth - using free source graphics and free software.