trimetrogon
/traɪˈmɛtrəɡɑn/
noun
- A type of aerial camera system that takes three photographs at the same time (one vertical and two oblique) to cover a wide area for mapping.
- The trimetrogon system captured overlapping images that helped cartographers draw accurate maps.
- Trimetrogon photography was widely used in the mid-20th century for creating topographic maps.
- The survey team used a trimetrogon camera to map the entire valley from the air.