An isoline map is one with continuous lines that join points of the same value together. The most common type of isoline map is one that shows lines that indicate equal elevation (a contour map). Other isoline maps feature different variables: temperature (called isotherms); barometric pressure (isobars); wind speed (isotachs); and wind direction (isogons), etc.
The isoline map shown above shows annual rainfall for the state of Washington in 1996.
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