Isoline Map

http://images.google.com/imgres?imgurl=http://personal.uncc.edu/lagaro/2101/2101_ProjectsF99/isolines.gif&imgrefurl=http://personal.uncc.edu/lagaro/2101/2101_ProjectsF99/jswing.html&h=548&w=725&sz=16&hl=en&start=14&tbnid=IU9cF0iZMxAH0M:&tbnh=106&tbnw=140&prev=/images%3Fq%3DIsoline%2BMap%26gbv%3D2%26hl%3Den

The above photo is an isoline map of the high temperatures in North Carolina on the date listed on the map (January 31, 1981). An isoline map (also known as countour map) is a map with continuous lines that joins at points of the same value such as equal altitude, temperature, wind speed, wind direction, etc.