Isoline Map

http://www2-pcmdi.llnl.gov/cdat/tutorials/cdatbasics/plotting-basics/modifying-isoline-plot

This is a map of the continents of the world and shows the isolines of either temperatre or barometric pressure. It is a isoline map because each of the lines that form an enclosed area show the point at which the measured quantity of temperature/pressure changes as you traverse the map.