In a manner relating to or measured by altimetry; with respect to altitude measurement.
From 'altimetric' (the adjective form of altimetry) plus the adverbial suffix '-ally,' meaning 'in the manner of altitude measurement.'
This is one of those wonderfully precise technical adverbs that scientists use when they need to specify that they're talking about height measurements specifically—it might sound clunky, but it prevents crucial confusion in research!
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