This form of measurement is called hypsometry from the Greek hypsos, "height" and metria.    From Wordnik.com.  [Telegraph.co.uk - Telegraph online, Daily Telegraph and Sunday Telegraph] Reference

I do not know that accurate levels have been taken in the valley of the Jordan above the Lake of Tiberias, and our information is very vague as to the hypsometry of the northern part of the Wadi-el-Araba.    From Wordnik.com.  [The Earth as Modified by Human Action] Reference

Oh, wisdom of man and the apparatus of the sciences, the little columns of mercury that sling up and down, the vacuum boxes that expand and contract, the hammer that chips the highest rocks, the compass that takes the bearings of glacier and ridge -- all the equipage of hypsometry and geology and geodesy -- how pitifully feeble and childish it seems to cope with the majesty of the mountains!.    From Wordnik.com.  [The Ascent of Denali (Mount McKinley) A Narrative of the First Complete Ascent of the Highest Peak in North America] Reference

In the next part of this series I shall continue the theme of hypsometry with a discussion of how the heights and depths of geographic features affect climate, both locally and globally. http://geology. rutgers.edu/103web/Pangeabreakup/breakupframe. html.    From Wordnik.com.  [Scientific Blogging] Reference