Classed Choropleth Maps

Although earlier I presented just plain choropleth maps, we are now taking a look at a specific type of choropleth map, the classed choropleth maps.  Classed choropleth maps are of course choropleth maps, these maps display data through a color visualization method.  Each color on a classes choropleth map represents a range of data rather than a specific number.  As seen in the classed choropleth map above, you can easily see the states with the greatest population over 65 years of age in 1990 as collected by the Censes Bureau.  As you can see from the map and the key, each color represents a percent range.

The map URL is: http://my.ilstu.edu/~jrcarter/Geo204/Choro/CIESIN-2003/