Surveying
If ‘δ’ is the declination of the Polaris and ‘λ’ is the latitude of the place, the azimuth of the Polaris, is

sin (90° - δ)/sin (90° - λ)
cos (90° - δ)/cos (90° - λ)
cos δ/cos λ
tan (90° + δ)/tan (90° + λ)

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Surveying
In triangulation surveys

The area is divided into triangular figures
All listed here
Control stations are located from which detailed surveys are carried out
Sides are not measured excepting the base line

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Surveying
Pick up the correct statement for horizontal photographs.

The two sides of a road meet at the vanishing point
All listed here
Parallel lines do not appear parallel in central projection
The lines parallel to the negative plane are projected as parallel lines

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Surveying
Refraction correction

completely eliminates curvature correction
has no effect on curvature correction
partially eliminates curvature correction
adds to the curvature correction

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