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section-choropleths-in-depth.html
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section-choropleths-in-depth.html
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<!DOCTYPE html>
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<title>map school: Choropleths in Depth</title>
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<h1><a href='./'>map school: Choropleths in Depth</a></h1>
<p>a free introduction to geo.</p>
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<p>The selection of colors in a choropleth map is generally called the 'palette' or the 'color ramp', especially when the colors are sequential. <a href="http://colorbrewer2.org/">ColorBrewer</a> is a well-researched set of colors that are understandable and clear.</p>
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