http://www.grossmont.edu/judd.curran/outline1.htm
An isoline is a line on a map that connects points of equal value. Using "isolines" is a common and very useful method of showing varying levels or concentrations of some phenomenon. Some examples would be equal altitude (contour lines), temperature (isotherms), barometric pressure (isobars),wind speed (isotachs), wind direction (isogon), wind shear (isoshear), and etc. Isoline mapping is used to interpret the information on some thematic maps.
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