Trimetrogon

Trimetrogon is an aerial photographic survey involves the use of three cameras in one assembly. One camera is pointed directly downwards, and the other two are pointed to either side of the flight path at a 30° depression angle (60° from vertical). 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]

References
  1. "Antarctic Air Photography". Polar Geospatial Center. University of Minnesota. Retrieved 13 August 2015.
  2. "Trimetrogon Photography". CEARS – Historic Aerial Photo Blog. Wordpress.com. 21 May 2014. Retrieved 13 August 2015.
  3. "trimetrogon". American Heritage Dictionary of the English Language. Houghton Mifflin Harcourt. 2015. Retrieved 13 August 2015.

Further reading
  • Imhof, R.K.; Doolittle, R.C. (1966). Thompson, M.M. (ed.). Mapping from oblique photographs (3rd ed.). Falls Church, Virginia: American Society of Photogrammetry. pp. 875–917.
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