The Collaborative International Dictionary of English v.0.48:

Altimetry \Al*tim"e*try\, n. [Cf. F. altim['e]trie.]
   The art of measuring altitudes, or heights.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "altimetry":
   altimeter, bathymetry, biometrics, biometry, cadastration,
   cartography, chorography, craniometry, geodesy, geodetics,
   goniometry, hypsography, hypsometer, hypsometry, mensuration,
   metrology, oceanography, planimetry, psychometrics, psychometry,
   stereometry, surveying, topography