30 - Continuously variable proportional circle map

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.

31 - Range Graded Proportional Circle Map

This range graded proportional circle map was found at: http://gsc.nrcan.gc.ca/mindep/synth_dep/sedex/images/fig17.jpg. It depicts proportional circles whose sizes represent a range of data.

32 - Classed Choropleth Maps

This classed choropleth map was found at: https://www.e-education.psu.edu/files/geog860/image/citationexample.jpg. A classed choropleth map is a thematic map that uses shading used to represent some class attribute value.

33 - Unclassed Choropleth Map

An unclassed Choropleth map does not have any classes identified. A map example that depicts this is located at: http://www.math.yorku.ca/SCS/Gallery/milestone/sec5.html.

34 - Bivariate Choropleth Maps

This bivariate Choropleth map was found at: https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKKODN2O_-3grLD7G94mkHOrFblHANPN-GqLkguSofk6vdYqbIdhb2CO4oMXtiPS87AedyqXwTMEjSXpXNgqm_md-_t8WhWa9EYBkTdK8hFzidzmJq6opELMI0VpcEhYqNPpsPx1sZzzc/s400/Income+Distribution+By+Race.gif Bivariate choropleth maps show data for two variables. For example, this could be the population by race, or gender in the U.S.

35 - Unvariate Choropleth Map

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.

36 - Standardized Choropleth Maps

This standardized choropleth map was found at: http://pubs.usgs.gov/tm/tm11c2/images/coverphoto.jpg. These maps show data that has been standardized showing not raw numbers but statistical averages or percentages.