Saturday, September 4, 2010

Bivariate choropleth maps


Bivariate choropleth mapping allows for two different variables to be shown in the same geographical location by giving each variable its own distinct representation.  The above image shows the population of a region in 1997 and the median house value in the same region.  The differing variables are contrasted by using pink spots for population and green spots for median house value, each spot larger with numeric increase.

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