Nominal area choropleth map

http://mapmaker.rutgers.edu/355/africa_political.gif

Nominal area choropleth map displays nominal data.

Unstandardized choropleth map

http://www.sfu.ca/unigis/images/price10.jpg

Unstandardized choropleth map uses raw numbers and the datd is not average on display.

Standardized choropleth map

http://www.statcan.gc.ca/pub/92f0138m/2008003/figures/figure3.1-en.jpg

Standardized compares distribution in different locations and also only shows one specific set of data.

Univariate choropleth map

http://www.princeton.edu/~rvdb/JAVA/election2004/purple_america_2004_small.gif

Univariate choropleth map displays a single data set using different colors and shades.

Bivariate choropleth map

http://www.pop.psu.edu/images/gia/maps/changeanim.gif

Bivariate choropleth map display two different variables displayed on a map using different colors.

unclassed choropleth map

http://www.nass.usda.gov/research/atlas02/Crops/Vegetables%20and%20Melons%20Harvested/Vegetables,%20Acres%20Harvested%20for%20Sale-choropleth%20map.gif

Unclassed choropleth map dos not use range grade data.

classed choropleth map

http://www.ilstu.edu/~jrcarter/Geo204/Choro/map-AmFact-6eqint-orange-80pct.jpg

classed choropleth map is uses color and shading to determine the value mapped.