A classed choropleth map uses different shades of color to determine different measure of a value. The classed choropleth map below shows amount in tons of 1992 beef cattle emissions in North Carolina.
http://1.bp.blogspot.com/-0ALDD7RZI8s/T294UVyXWcI/AAAAAAAAAEs/AawErJvgfIA/s1600/beefmethaneJMK.gif
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