Surveying
The scale of a tilted photograph of focal length f, taken from an altitude H, along the plate parallel through plumb point, is

f/H sec θ
f sec θ/H
f/H cos ½θ
f/H

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Surveying
Refraction correction

adds to the curvature correction
partially eliminates curvature correction
has no effect on curvature correction
completely eliminates curvature correction

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Surveying
A ’level line’ is a

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

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