Isopleths are countering lines that connect values of the same kind. These maps are useful when trying to display trends of a given factor. In the example above, one is able to see where the different pH levels are found around the United States.
http://dwb4.unl.edu/chem/chem869v/chem869vlinks/weather.about.com/newsissues/weather/library/weekly/aa071600a.htm
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