This type of map is similar to the Range Graded Proportional Circle maps in that the shadings used are standardized. This is also done for statistical purposes, and, like said example, can be easily manipulated.The map above is of the Beef Cattle emissions in North Carolina during 1992.
Where example was found: http://personal.uncc.edu/lagaro/2101/2101_ProjectsS2001/beefmethaneJMK.gif
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