Discussion
How many location photographs are required (at least) for photogrammetry ?
Answer: B
At least 2 photographs are needed.
Photogrammetry recovers three-dimensional measurements from photographs. A single photograph fixes only the direction from the camera to each point, not its distance. Two photographs of the same scene taken from different positions give two lines of sight to each point, and their intersection fixes the point in space, the same principle as stereoscopic vision.
With 1 photograph, measurements are possible only with extra information such as a known reference scale in the same plane. More than two photographs (3 or 4) improve accuracy and coverage, but they are not the minimum.
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