This is a map surface map that depicts relief. Three-dimensional information is communicated by this type of map in a number of forms color and shaping, raised relief or contour lines. In addition to relief or topography, other variables that describe a phenomena or process can be superimposed onto the maps surface. To show this type of variable superimposed onto a map I selected a map showing the depth to the water table in the state of Wisconsin. The map uses differing shades of blue to show depth, with lighter being closer to the surface then the darker blues.
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