(Received 18 March 1985; accepted 29 April 1985)
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The perspective grid technique commonly utilizes a square reference scale in the camera's field of view from which a grid pattern is graphically laid out in the photograph to measure distances lying in the same object plane as the scale. An improved technique described in this paper uses three circular scales as a basis for determining the X and Y coordinates of a point in the object plane from the x and y coordinate positions of its image in the photograph. This method offers the advantages of better accuracy and less tedious graphic methods of grid construction. A step-by-step procedure of constructing rectangular coordinate systems using either circular or square reference scales is presented.
Consulting engineer, W. G. Hyzer Associates, Janesville, WI
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