Surveying
The station where observations are not made, but the angles at the station are used in triangulation series, is known as

Main station
Pivot station
Subsidiary station
Satellite station

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Surveying
The rise and fall method

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

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Surveying
Homologous points are

Corresponding points on the ground and photograph
Nodal points of the camera lens
Plumb points of stereo pair of photographs
Opposite corners of a photograph

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