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 function of tilt
Is a good property

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Surveying
Spring tides are caused when

Solar tidal force and lunar tidal force both coincide
Sun and moon are in line with earth
Solar tidal force acts opposite to lunar tidal force
None of these

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Surveying
Contour interval is

Larger for accurate works
Larger if the time available is more
Inversely proportional to the scale of the map
Directly proportional to the flatness of ground

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