Isoline map

http://www.ssg-surfer.com/ssg/detailed_description.php?products_id=138

An isoline map shows a variable with a continuous line connecting points with the same value together. This map shows the predicted high temperatures for June 27. This is a isoline map. It uses contours to demonstrate the differences in temperature. A isoline map demonstrates a third variable, which in this case is the difference in the predicted temperatures. The change in contour lines represents the change in temperature, which is kept constant. The map also uses very omitted amount of detail such as labeling major cities and only shown the boundaries of the United States and all the states and omitting the ocean as wells as Canada and Mexico. Also Alaska is not shown here. A legend is provided to define what color corresponds to what color.