Nominal area chrorpleth map

http://my.ilstu.edu/~jrcarter/Geo204/Choro/Tom/

Nominal area choropleth map is a choropleth map that is used to dispaly nominal data.

http://dianesmapcatalog.blogspot.com/2008/08/unstandardized-choropleth-map.html


Unstandardized choropleth maps utilize numbers when displayed. 

This map shows Forage-Land use for all Hay and all Haylage, Grass Silage and Greenchop Harvested Acres, in 2002.

Standardized choropleth maps

http://www.geovista.psu.edu/grants/nci-esda/research.html
This is a standardized map in cervical cancer showing the variations of it.

univariate chrorpleth maps

www.cdc.gov/pcd/issues/2007/oct/07_0091.htm
Univariate chrorpleth maps displays a single data set.

This map shows the percentage of individual in US.

Bivariate chrorpleth maps

http://proceedings.esri.com/library/userconf/proc99/proceed/papers/pap171/p171.htm


Bivariate mapping is an important mapping technique in cartography. Given a set of geographic features, it maps two variables on a single map by combining two different sets of graphic symbols.

Unclassed chrorpleth maps

http://www.esds.ac.uk/international/support/user_guides/gisoverview.asp

 These maps shows difference between two different categories.

Showing different relations between two categories.

classified choropleth maps

http://curriculum.qcda.gov.uk/key-stages-3-and-4/assessment/nc-in-action/items/geography/9/1447.aspx

classifed choropleth map that uses graded differences in shading or color or the placing of symbols inside defined areas on the map in order to indicate the average values of some property or quantity in those areas