Surveying
The negative sign is assigned to

Correction for slope
Reduction to mean sea level
All listed here
Correction for horizontal alignment

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Surveying
Theodolite is an instrument used for

measurement of vertical angles only
tightening the capstan-headed nuts of level tube
measurement of both horizontal and vertical angles
measurement of horizontal angles only

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Surveying
Homologous points are

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

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