Bivariate Choropleth Map
A bivariate choropleth map displays two variables on a single map by combining two different sets of graphic symbols or colors simultaneously. The main objective of a bivariate choropleth map is to find a simple method for accurately and graphically illustrating the relationship between two spatially distributed variables. Bivariate choropleth maps have potential to reveal relationships between variables more effectively than a side-by-side comparison of the univariate maps. Bivariate mapping is a recent graphical method which is intended to convey the spatial distribution of two variables and the geographical concentration of their relationship. The image shown above is an example of a bivariate choropleth map that combines to show what percentage of the population is under eighteen as well as those that live in rural areas in Poland.
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