Isopleth

Isopleth maps take on two different meanings, depending on what they are being applied towards. In cartography, Isopleth lines represents equal data that must be calculated and not measured. In meteorology, Isopleths can be any kind of contour line. In the map below the geographical term is being demonstrated as a laboratory has to calculate hydrogen ion concentration as PH.





http://2.bp.blogspot.com/_f9wcd3zZdq0/STlvaYI5AbI/AAAAAAAAANM/PPqm6BqPWQw/s320/isopleth.gif