How many location photographs are required (at least) for photo- grammetry ?
2
2 option is correct.
Photogrammetry recovers three-dimensional geometry of a scene from photographic images by triangulating the same point as it appears in overlapping views. The minimum number of images required to reconstruct a 3D location is therefore two — a stereo pair — because a single photograph gives only a two-dimensional projection and depth cannot be inferred from one view alone.
Additional photographs (three, four or more) improve accuracy and cover occluded surfaces, but the theoretical and practical minimum stands at two. That is why crime-scene photogrammetry protocols mandate paired overlapping photographs from known camera stations before any measurement is attempted.
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