An isopleth map is a map that uses contour lines to show a distribution of equal values. There are many types of isopleth maps such as isobar, isoplat, isohyet, and many others. The above image is from the univesity of Michigan at http://www.globalchange.umich.edu/globalchange1/current/lectures/kling/water_nitro/USAacid_rain2.gif
and shows the levels of acidity in the United States.
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