from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of or relating to hypsography (measuring altitude or depth versus area)
from The Century Dictionary and Cyclopedia
- Of or pertaining to hypsography, or the science which deals with the altitudes of different portions of the earth's surface: as, a hypsographic map, one showing by contour-lines, or other symbols, the relative elevation of the different portions of the territory mapped. See hypsography.
Sorry, no etymologies found.
The depth of the coastal zone has been established through an interesting historical accident-essentially based on the shallowest isobath that was originally used in the early 20th century hypsographic analysis.