A Bivariate choropleth map shows two variables on a single map by combining two different sets of graphic symbols or colors. This is an important feature and technique in cartography. These types of maps are variations of simple choropleth maps that portrays two separate entities. simultaneously. The purpose of these maps are to find a simple method for accurately illustrating the relationship between two spatially distributed variables. This map is showing the percentage under the age of 18 years old.
http://www.geo.unizh.ch/~annal/Choropleth%20maps.html
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