Isopleths

Isopleths are contour lines used on meteorological charts in order to show connecting points for some equal value in variable. Isopachs, isohytes and isotachs are all types of isopleths. This example illustrates the equivalent values of the chloride ion wet deposition.

http://nadp.sws.uiuc.edu/isopleths/maps2003/cldep.gif