Trimetrogon
From Infogalactic: the planetary knowledge core
Trimetrogon is an aerial photographic survey method that involves the use of three cameras in a single assembly. One of the cameras is pointed directly downwards, and the other two are pointed to either side of the flight path at a depression angle from the horizontal of 30 degrees. The images overlap allowing the use of stereographic interpretation of topography.[1][2]
The name comes from the Metrogon cameras used in the original montages.[3]
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