- A bivariate map displays two variables on a single map by combining two different sets of graphic symbols or colors. It is a variation of simple choropleth map that portrays two separate phenomena simultaneously.- This map uses cartographic animation, so the map shows the rates between the rate in the individual states to a map that also shows the divorce rate by individual counties within each state.
- http://www.pop.psu.edu/images/gia/maps/changeanim.gif
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