Surveying
If the general ground level of any area is 10% of the flying height, the principal points may be used as the centers of radial directions for small scale mapping even in tilted photograph up to

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the eye-piece than to the objective lens
much closer to the objective lens than to the eye piece
midway between eye piece and objec-tive lens
anywhere between eye-piece and objective lens

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