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A system of aerial photography in which one vertical and two oblique photographs are simultaneously taken for use in topographic mapping.
[tri- + Metrogon, trademark for a kind of camera lens.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014