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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]
References in periodicals archive ?
In the 1946-47 southern summer, Martin Mariner seaplanes and other aircraft operating from aircraft carriers, took some 65,000 aerial photographs with trimetrogon cameras, covering nearly half of the Antarctic coastline (Rose & Conger 1980, 249-250).
A pesquisa, segundo Valverde, tem como objetivos caracterizar e representar cartograficamente os sistemas de utilizacao da terra e os regimes de propriedade em vigor no leste da Paraiba, apresentar sugestoes para um planejamento rural na regiao estudada, alem de realizar uma experimentacao de metodo, qual seja o da interpretacao de fotografias aereas no sistema trimetrogon, para cartografar a utilizacao da terra.
Photogrammetric rectification of oblique Trimetrogon imagery.
Another eight maps illustrate the expedition routes, territorial claims, and Operation Highjump's trimetrogon photogrammetric mapping of one and a half million square miles of Antarctica.
This oblique (trimetrogon) coverage was completed by the Royal Canadian Air Force in the early 1950s, and the coverage of vertical photography was completed in the late 1950s.