A chloropleth map uses shading to show the quantity of the variable that is present in the area of interest. It can be used for political polls, population density, and crime rates. The map below depicts the population density in the United States.
2. Isarithmic Map:
Isarithmic maps are not defined by boundaries but are fluid in their transitions. Common isarithmic maps can visualize temperature levels and elevation heights. The map below shows the strength of party identification across the United States.
3. Dot Density Map
Dot density maps use dots to show the clusters or hubs of whatever variable or characteristic is being studied or measured. These are commonly used for population density and school distribution/quantity. The image below depicts the population of US states by dots, each representing 10,000 people.
4. Proportional Symbol Map
This type of map represents the size of a variable by a proportionally sized symbol. These can be used for human consumption of goods and various population proportions. This map uses an oil symbol to show the relative amount of natural gas consumed by each state.
The following map shows red elevation lines across Georgia beginning with the an elevation level of 200 feet and increasing to an elevation of 1200 feet. The yellow lines represent the path of a water drop if it were to be dropped from a certain elevation.
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