Surveying
In direct method of contouring, the process of locating or identifying points lying on a contour is called

centring
horizontal control
ranging
vertical control

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Surveying
The meridian of a place is

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
A semi-circle which passes through the place and is terminated at the poles

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