http://www.envisci.ucr.edu/ensc176/es176_2003/ENSC_176_Summer_2003.html
Isopleths connect points which have the same numerical value of a certain variable. For example, this isopleth map shows the percentage of CO2 concentrations in the soil in 1999. The green lines represent tree kill boundaries. As you can see, the highest concentrations of carbon dioxide area found in the middle of the tree-kill area.
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