Hypsometric Map

http://my.ilstu.edu/~jrcarter/LDEO/Geo201maps.htm

This is an example of a hypsometric map, which is a surface map (2-D map) with relief shown (3-D features). The feature being represented in this map is that of elevation. It shows both elevation above and below sea level of the entire world via color shading. The darker red the shading the higher the elevation above sea level, while the darker blue the shading is than the deeper the ocean stretches.