Chloropleth Map
This is a map in which areas are shaded to show the measurement of a statistical variable. An example of this are maps used during presidential elections to show which states are controlled by which candidates.
Dot Density Map
This type of map uses dots or another unifrom symbols to portray the geographic distribution of different factors of an area such as population.
Proportional Symbol Map
This map uses a uniform symbol at different sizes to represent different amounts of a factor in an area.
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