http://www.earthexplorer.com/2009-03/Subsurface_Geology_Challenges_Goiania_Metro.asp This hypsometric topographical map uses color and shape to indicate variations in height, thereby detailing three-dimensional information in a manner beyond mere contour lines (which are included) and raised relief. The key to this map is exceptionally informative, showing direction, scale, and a clear gradient for interpreting elevation by color.
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