Surveying
Pick up the incorrect statement from the following. High oblique photographs

May include the image of the horizon
May not include the image of the horizon
None of these
May have tilt up to 30°

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

taking both face observations and taking the mean of the two
double sighting
taking mean of several readings distributed over different portions of the graduated circle
reading both verniers and taking the mean of the two

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