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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.]
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]