Direct link to map: http://amlcartography.sourceforge.net/CSaDImages/fig92a.png
A isopleth is a line on a map connecting places registering the same amount or ratio of some geographical or meteorological phenomenon. An isopleth is also called a isogram isoline. This illustration is a bivariate color symbolization. Color bivariate isolines can be created by changing the current line's color and drawing a second isoline coverage. Color, bivariate fishnets can be generated by hue shading a surface.
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