Which photogrammetry term refers to a photographic unit consisting of three wide-angle single-lens cameras?

• A. Terrestrial Photogrammetry
• B. Aerial Photogrammetry
• C. Trimetrogon Photograph
• D. Composite Photograph

Answer: (C)

In photogrammetry, a three-camera aerial setup is called a trimetrogon photograph. This unit usually includes one vertical camera aimed straight down and two wide-angle cameras angled to the sides, capturing oblique views in addition to the vertical view. The resulting trio of images provides overlapping perspectives from a single pass, enabling stereoscopic viewing and accurate 3D interpretation for mapping.

This name specifically describes that three-camera arrangement, which is why it’s the best fit. Other terms refer to different concepts: terrestrial photogrammetry is ground-based; general aerial photogrammetry covers aerial images without implying a fixed three-camera system; a composite photograph is a single image assembled from multiple sources, not a standardized three-camera unit.