http://www.kidsgeo.com/geography-for-kids/0034-isolines.php
An isoline map is a map with continuous lines that serve to join points of the same value, it is often used by meteorologists in order to show weather phenomenon. Here is the winds forecast, this kind of phenomenon doesn't follow lines that we are familiar with or logical lines, for example the wind speed can be the same in Pennsylvania and in only half of Ohio (as shown on this map). Isoline maps are very useful to display this kind of situation.
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