Given a set of geographic features, it maps two variables on a single map by combining two different sets of graphic symbols. the term "bivariate maps" specifically refers to bivariate choropleth maps that display two variables using graduated color symbols. Here we see a bivariate map showing population stats from France. http://images.google.com/imgres?imgurl=http://go.owu.edu/~jbkrygie/krygier_html/geog_353/geog_353_lo/geog_353_lo08_gr/choro_1836.jpg&imgrefurl=http://mavance2000.blogspot.com/2008/07/bivariate-choropleth-map.html&h=472&w=360&sz=79&hl=en&start=11&tbnid=6TEgPKlY89GShM:&tbnh=129&tbnw=98&prev=/images%3Fq%3DUnclassed%2Bchoropleth%2Bmaps%26gbv%3D2%26ndsp%3D21%26hl%3Den%26sa%3DN
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