Chloropleth Map
A chloropleth map is a map that uses colors or shading across an area in order to show a value.
Proportional Symbol Map
A proportional symbol map is a map in which a symbol is used over an area with varying sizes in order to show a value.
Dot Density
A dot density map is a map that uses dots to show the presence of a phenomenon. In areas where the dots are dense, the phenomenon is more concentrated.
Isarithmic Map
An isarithmic map is a map that uses lines to bind in an area in order to depict a phenomenon like elevation or weather phenomenon.
Isarthimic maps are often used to show elevation, as I did in this map of the San Gabriel Mountain Range in Southern California:
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