A choropleth map is a map where areas are shaded based on a statistical proportion. It is used to compare a variable in different areas, such as rates of child suicides in various Minnesota counties, as outlined in the chart above.
Dot Density -
A dot density map uses dots, scattered across an area to represent a phenomenon. It can be used to display a high number of people, objects, or anything else that may be measured, such as shown above, with each dot representing ten people. The specific location of each dot is not important, but rather the area it covers. And speaking of density...
Proportional Symbol -
A proportional symbol map shows aspects of a physical, social, economic, etc. nature, where each symbol is proportionately bigger or smaller to easily see the differences between the areas shown on the map, as seen above, comparing counties with larger and smaller populations of people older than 65 in Buffalo, NY.
Topographical -
A topographical map illustrates differences in sea level, indicating steepness using the proximity of the lines to one another. This map is excellent for producing a more accurate idea of the lay of the land of an area as it does account for how high above sea level some areas may be.
Hurricane Isaac -
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