Statistical Map

This map was taken from http://seattlebubble.com/blog/2006/09/11/mapping-housing-market-health/

This is a good example of a statistical map.  These maps take some sort of statistical data and place them on a map to try to convey information.  This is an example of median household income loss.  So that there are not just numbers on the map, the legend offers colors split into categories.