An isoplethic map uses contour lines to show some variable which cannot be measured at a point, but which instead must be calculated from data collected over an area. This specific map shows Hydrogen ion concentration as pH in the US for 1998.
Sunday, July 15, 2012
Isoplethic Map
An isoplethic map uses contour lines to show some variable which cannot be measured at a point, but which instead must be calculated from data collected over an area. This specific map shows Hydrogen ion concentration as pH in the US for 1998.
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