Isoline Maps

Source: http://www.ux1.eiu.edu/~cfjps/1400/chapter3.html

Isoline maps utilize lines to show areas of equal value. Their lines connect, and can represent anything from the temperature, to the average rainfall. They are very similar to contour lines, which are used to describe elevation. Isolines are never allowed to intersect because that would mean a line is representing more than one value.  If the isolines are closer together, it is apparent that there are changes in numeric value taking place in a small area. For instance, this Isoline map is of the weather in the U.S. The lines are fairly spread out, but if they were closer we would know that the weather fluctuates in different states. I chose this map because I think it is an easy way to interpret what an Isoline map truly looks like. It is not very complicated which allows for a better understanding.