Isoline Map

This map was taken from http://www.kidsgeo.com/geography-for-kids/0034-isolines.php

This is a good example of an Isoline Map.  An Isoline Map has continuous lines that connect joining points of the same value.  Isolines are placed on top of an existing spatial map to show things like precipitation, general weather, and wind speeds.  Here the isolines quickly show the distribution of wind speeds in the United States.