An isoline map is a map with continuous lines joining points of the same value. Examples would be equal altitude (contour lines), temperature (isotherms), barometric pressure (isobars), wind speed (isotachs), wind direction (isogon), wind shear (isoshear), etc. Isoline mapping is used to interpret the information on some thematic maps. This isolines can also be used to describe any other type of data. For example, this population map uses isolines to represent the distribution of human beings around the Earth. Another common use of isolines is to show areas that are of the same elevation.
Source:http://www.kidsgeo.com/geography-for-kids/0034-isolines.php
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