Perspective Definitions for Land Surveyors

perspective center—The point of origin or termination of bundles of perspective rays. The two such points usually associated with a survey photograph are the interior perspective center and the exterior perspective center. In a perfect lens-camera system, perspective rays from the interior perspective center to the photographic images enclose the same angle as the corresponding rays from the exterior perspective center to the objects photographed. In a lens having distortion this is true only for a particular zone of the photograph. In a perfectly adjusted lens-camera system the exterior and interior perspective centers correspond, respectively, to the front and rear nodal points of the camera lens.

perspective grid—See grid, perspective [PHOTOGRAMMETRY].

perspective plane-See plane, perspective.

perspective projection-See projection, perspective.

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

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