Isoline Map

http://mapmaker.rutgers.edu/355/links.html

Isoline maps are also known as contour mapping because of the contour lines that are essentially imaginary lines that represent equal amount of the variable being mapped. When the lines get closer together it means there is a drastic change in a small area; therefore, when the lines get further apart it means there is little to no change in a large area. In the map above, the variable being mapped was degrees Fahrenheit in Australia with each line representing a certain degree.