The earliest known choropleth map was created in 1826 by Baron Pierre Charles Dupin, depicting the availability of basic education in France by department. More "cartes teintées" … See more

Every choropleth map has a strategy for mapping values to colors. A classified choropleth map separates the range of values into classes, with all of the districts in each class being assigned the same color. An unclassed map (sometimes called n-class) … See more

It is possible to represent two (and sometimes three) variables simultaneously on a single choropleth map by representing each with a single-hue progression and … See more

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• Cartograms, which are often colored as choropleths.
• Chorochromatic map
• Dasymetric map
• Dot distribution map See more

A choropleth map brings together two datasets: spatial data representing a partition of geographic space into distinct districts, and … See more

The final element of a choropleth map is the set of colors used to represent the different values of the variable. There are a variety of different approaches to this task, but the primary principle is that any order in the variable (e.g., low to high quantitative values) … See more

A choropleth map uses ad hoc symbols to represent the mapped variable. While the general strategy may be intuitive if a color progression is … See more