Bivariate Choropleth Map

1.       

http://www.geog.le.ac.uk/russianheartland/DemographicMaps/Raions.html

These maps show two separate variables in response to one specific issue. Different colors are used to shade the difference between the variables. This bivariate choropleth maps shows Russia’s population density in 2002 versus 1989 and Russia’s central federal district.