Surveying
The want of correspondence in stereo-photographs

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

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

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

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Surveying
The rise and fall method

is less accurate than height of instrument method
provides a check on the reduction of intermediate point levels
quicker and less tedious for large number of intermediate sights
is not suitable for levelling with tilting levels

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