Choropleth maps are used to portray areal data. These are a large category of maps which are commonly used by many to portray various data. Areal divisions that are typically used in choropleth maps are variables such as , census tracts, counties and states. Numerical values within these choropleth maps are typically areally averaged, meaning it is not just a total value, but it is statdardized to a certain unit. This bhoropleth map seen above is illustrating the 2004 presidential votes to each states electoral votes. As you can see each different level of votes is labeled in a different shade of green. This is a good example of the main pattern of interest of a choropleth map, in that it is used to represent many different variations of data.
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