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| Choropleth Map |
A choropleth map uses varying colors to visually display statistical differences across a region, looking at things such as population density or, as seen above, voter turnout as a percentage of voting age population.
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| Dot Density Map |
Dot density maps use dots to visually display the concentration of a particular phenomena in an area. Dots are typically used to represent a larger statistic in that particular area.
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| Proportional Symbol Map |
Proportional symbol maps use symbols of varying sizes to represent a particular statistic in an area. Typically, the larger the symbol, the larger the statistic of whatever is being represented.
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| Isopleth Map |
Isopleth maps use curved lines to stand for a particular number. Typically, the statistic is lower below the line, higher above the line, and somewhere in the middle between two lines. In the map above, the the average level of precipitation in inches in Georgia, from the Florida state line to that first large contour line, would be between 55 and 50.
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