Surveying
The want of correspondence in stereo-photographs

Is minimum when θ is 3°
Is not affected by the change of flying height between photographs
Is a good property
Is a function of tilt

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Surveying
A ’level line’ is a

line passing through the objective lens and the eye-piece of a dumpy or tilting level
horizontal line
line parallel to the mean spheriodal surface of earth
line passing through the center of cross hairs and the center of eye piece

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