hypsometric map that uses contour lines to represent a third variable. Contours are lines that join equal values of the variable being mapped at a constant interval that describe the elevational change between contour lines.
In this example, the overall shape and distortion of the surface of the Mona Lisa, is illustrated, with the contour interval defined at the right-hand side of the image.
This image can be found at http://www.nrc-cnrc.gc.ca/aboutUs/nrc90/monalisa/contour_e.html
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