swing [PHOTOGRAMMETRY]¹ The rotation of a photograph in its own plane around the photograph perpendicular. ² The angle at the principal point of a photograph measured clockwise from the positive y-axis to the principal line at the nadir point. ³ The swing of certain stereoscopic plotting instruments swing represented by ҡ; the angle of rotation of a photograph about its own plane measured relative to the axis of flight.

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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