photogrammetry measurement technique co-ordinates of points in 3d of object determined measurements made in 2 photographic images (or more) taken starting different positions, different passes of aerial photography flight. in technique, common points identified on each image. line of sight (or ray) can built camera location point on object. intersection of rays (triangulation) determines relative three-dimensional position of point. known control points can used give these relative positions absolute values. more sophisticated algorithms can exploit other information on scene known priori (for example, symmetries in cases allowing rebuilding of three-dimensional co-ordinates starting 1 position of camera).
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