CIVIL SNAPS - SURVEYING

CIVIL SNAPS – SURVEYING

Angles in compass survey

• True bearing/ azimuth:

Horizontal angle between true meridian and survey line, is constant for a line, found out by astronomical observations

• Magnetic bearing:

Horizontal angle between magnetic meridian and survey line, varies with time, found using compass

• Arbitrary bearing:

Horizontal angle between arbitrary meridian and survey line, used while surveying small areas

• Magnetic declination:

Horizontal angle between true meridian and magnetic meridian, varies with place and time

• Dip:

Angle made by a freely suspended magnetic needle with horizontal

• Local attraction:

Angle of deviation of a freely suspended magnetic needle in horizontal plane from normal position due to external attractive forces

CIVIL SNAPS – SURVEYING

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CIVIL SNAPS – SURVEYING