Isoline map

Isoline maps are used when there is a need to represent a three dimensional model in 2 dimensions. These maps have continual lines which link points of equal value. An example of this would be contour lines which we see on topo maps. These lines join at points of equal elevation. Isolines are also used to show wind speed in which case they are called isotachs, or to disply temperature in the form of isotherms. This map below is an example of isotherms since the isolines are relating to temperature.

                                                                                    

Link: http://ert09.blogspot.com/2010/04/isoline-maps.html