
This continuous variable proportional circle map was located at: http://geographyfieldwork.com/DataPresentationMappingTechniques.htm. This type of map shows the relative sizes of some for some variable.
This Unvariate Choropleth map was found at: http://www.mint.com/blog/wp-content/uploads/2009/04/mint-income-r3.png
Unvirate choropleth maps are useful in showing data for a single variable. This could be the percentage of population that are getting the swine flu, or that make more than $50K per year. It would not show multiple variables data.
The following topographic map was noticed on: http://geology.isu.edu/geostac/Field_Exercise/wildfire/topography.htm
This type of map shows geographic features of an area, and shows contour lines that indicate terain direction, the rise and fall of the terrain, how gradual or severe the slope is, and other features.