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The Collaborative International Dictionary
Hypsometry

Hypsometry \Hyp*som"e*try\, n. That branch of the science of geodesy which has to do with the measurement of heights, either absolutely with reference to the sea level, or relatively.

Wiktionary
hypsometry

n. The measurement of elevation relative to sea level

WordNet
hypsometry

n. measurement of the elevation of land above sea level [syn: hypsography]

Wikipedia
Hypsometry

Hypsometry (from Greek ὕψος, hupsos, "height" and μέτρον, metron, "measure") is the measurement of land elevation relative to sea level. Bathymetry is the underwater equivalent. A hypsometer is an instrument used in hypsometry, which estimates the elevation by boiling water – water boils at different temperatures depending on the air pressure, and thus altitude.

On Earth, the elevations can take on either positive or negative (below sea level) values, and are bimodal due to the contrast between the continents and oceans. On other planets within this solar system, elevations are typically unimodal, owing to the lack of oceans on those bodies.