of or pertaining to a system of aerial photography using three cameras, one pointed directly downward and the others at 60° to it.

1940–45; tri- + Greek métro(n) measure + -gon Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trimetrogon (traɪˈmɛtrəˌɡɒn)
a.  a method of aerial photography for rapid topographic mapping, in which one vertical and two oblique photographs are taken simultaneously
 b.  (as modifier): trimetrogon photography
[from tri- + metro-, from Greek metron measure + -gon]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Most of the aerial photography is vertical, but some trimetrogon and oblique prints are available.
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