Surveying
The zenith is the point on the celestial sphere

South of observer
West of observer
North of observer
East of observer

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Surveying
Contour interval is

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

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Surveying
The meridian of a place is

A semi-circle which passes through the place and is terminated at the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles
An arc of the great circle which passes through the place and is perpendicular to the equator

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