http://www.ij-healthgeographics.com/content/3/1/18/figure/F6
Standardized choropleth maps are those that have been areally averaged (as opposed to unstandardized choropleth maps, which have not been areally averaged). When the numbers have been averaged, the data is then compared (usually by seeing how it is distribution over a specific area). The data is standardized because it is represented as ratios, percentages, rates, decimals, etc.
This is a standardized choropleth map of Bayesian smoothed prevalences in Lower Saxony.
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