Unstandardized Choropleth Map

http://images.google.com/imgres?imgurl=http://makingmaps.files.wordpress.com/2007/08/circle-choro1.jpg&imgrefurl=http://makingmaps.wordpress.com/2007/08/28/perceptual-scaling-of-map-symbols/&h=257&w=811&sz=64&hl=en&start=51&tbnid=Ef6qwzT4qmYkoM:&tbnh=46&tbnw=144&prev=/images%3Fq%3Dchoropleth%2Bmap%26start%3D40%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN

The above map is an unstandardized choropleth map showing geographic areas to their values. I believe this is unstandardized because it is using raw data (also incomplete and inaccurate), there isn't a table of contents attached to the map.

Standardized Choropleth Map

http://images.google.com/imgres?imgurl=http://content.answers.com/main/content/wp/en/thumb/2/28/180px-Choropleth.gif&imgrefurl=http://www.answers.com/topic/thematic-map-1&h=112&w=179&sz=12&hl=en&start=6&tbnid=ErFThf-AjewyWM:&tbnh=63&tbnw=101&prev=/images%3Fq%3DUnivariate%2Bchoropleth%2Bmap%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN

The above map is a standardized choropleth map of Canada showing the percentage of population 14 years old and under from 2006. A standardized choropleth map uses standardized data instead of raw numbers.

Univariate Choropleth Map

http://images.google.com/imgres?imgurl=http://content.answers.com/main/content/wp/en/thumb/2/28/180px-Choropleth.gif&imgrefurl=http://www.answers.com/topic/thematic-map-1&h=112&w=179&sz=12&hl=en&start=6&tbnid=ErFThf-AjewyWM:&tbnh=63&tbnw=101&prev=/images%3Fq%3DUnivariate%2Bchoropleth%2Bmap%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN

The above map is a univariate choroopleth map of the water use per day in the United States. A univariate map uses a single data (in this case it is water usage).

Bivariate Choropleth Map

http://images.google.com/imgres?imgurl=http://www.geocities.com/stevejford/Africa_Choropleth.jpg&imgrefurl=http://www.geocities.com/stevejford/new_page_2.htm&h=729&w=543&sz=51&hl=en&start=2&tbnid=auvyna5wjDy7OM:&tbnh=141&tbnw=105&prev=/images%3Fq%3DBivariate%2Bchoropleth%2Bmap%26gbv%3D2%26hl%3Den

The above map is a bivariate choropleth map showing land use, life expectancy and GNP per capita in Africa from 1989. A bivariate choropleth map displays two variable on a single map (in the top map it is showing two different variables - land use and GNP per capita). The main objective to this is to find a simple method for accurately and graphically issultrate the relationship between the two variables.

Unclassed Choropleth Map

http://images.google.com/imgres?imgurl=http://www.math.yorku.ca/SCS/Gallery/images/dupin2.gif&imgrefurl=http://www.math.yorku.ca/SCS/Gallery/milestone/sec5.html&h=1270&w=1223&sz=427&hl=en&start=1&tbnid=2E6yc4WZO3TV0M:&tbnh=150&tbnw=144&prev=/images%3Fq%3Dunclassed%2Bchoropleth%2Bmap%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN

The above map is an unclassed choropleth map of rates of illiteracy in France. An unclassed choropleth map is a map where color, gray scale, graduated colors indicate the level of the attributes displayed.

Classed Choropleth Map

http://images.google.com/imgres?imgurl=http://www.ilstu.edu/~jrcarter/Geo204/Choro/map-AmFact-4eqint-orange-80pct.jpg&imgrefurl=http://www.ilstu.edu/~jrcarter/Geo204/Choro/&h=312&w=520&sz=57&hl=en&start=20&tbnid=24j8JVFARwIw7M:&tbnh=79&tbnw=131&prev=/images%3Fq%3Dclassed%2Bchoropleth%2Bmap%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN

The above map is a classed choropleth map that shows the number of males per 100 females from the Census in the year 2000. A classed map groups data into classification intervals and then each interval is then assigned a graphic value that usually uses the principle of maximum contrast.

Range Graded Proportional Circle Map

http://images.google.com/imgres?imgurl=http://mapmaker.rutgers.edu/355/dotProporCircle.jpg&imgrefurl=http://mapmaker.rutgers.edu/355/links.html&h=645&w=918&sz=112&hl=en&start=7&tbnid=ajgqtcSGSSjMIM:&tbnh=103&tbnw=147&prev=/images%3Fq%3Dproportional%2Bcircle%2Bmap%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN

The above map is a range graded proportional circle map of an urban population taken from the U.S. Bureau of the Census in 1970. Range graded scaling is another scaling method term in which the circle is represented is grouped into classes and symbolized with a different size circles (in this case it would be population).