tilt [PHOTOGRAMMETRY]—The angle at the perspective center between the photograph perpendicular and the plumbline (or other exterior reference direction); also, the dihedral angle between the plane of the photograph and the horizontal plane. The direction of tilt is expressed by swing (when referred to the axes of a photograph) or azimuth (when referred to the exterior coordinate system). In aerial photography, tilt may be separated into its component angles referred to the fiducial axes, with the x axis being the one more nearly in the direction of flight. In aerial-camera orientation, a positive x tilt results from the left wing of the aircraft being lowered, displacing the nadir point in the positive y direction. Similarly, a positive y tilt results from the nose of the aircraft being lowered, displacing the nadir point in the positive x direction.

tilt, relative-1 The tilt of a photograph with reference to an arbitrary plane, not necessarily a horizontal plane, such as that of the preceding or subsequent photograph in a strip. 2 The angle between the photograph perpendicular and a reference direction, such as the photograph perpendicular of the preceding or subsequent photograph in a strip.

tilt displacement—See displacement, tilt.

tilted photograph—An aerial photograph made with the camera axis slightly tilted away from the vertical.

tilting level—See level, tilting.

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

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