http://www.nature.nps.gov/air/edu/lessons/figure3.cfmIsopleths are another form of contour maps, such as the Isopach and Isohyets also mentioned in this blog. The Isopleth is used if the specific variable being displayed can not be pinpointed. This map shows the distribution of rain fall across the US in 1996. In this map, similar to the other contour maps, each contour represents a different level of rainfall.
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