Surveying - Quick Revision Sheet

Quick revision

Formulas

• Angle of vision = 90° - clinometer reading
• tan(angle) = x / distance
• x = tan(angle) × distance
• h = x + (eye-height)

Book example

Key facts

• Surveying: science of measuring and recording distances, angles, heights and sizes of the earth's surface.
• Map: the most essential equipment of geographer, engineer and architect.
• Clinometer: measures the height of a tall object.
• Prismatic compass: measures horizontal angle from the magnetic north line.
• Aluminium ring: graduated to 30 minutes.
• Horse hair: in reality a fine silk thread or metal wire.
• Brake pin or knob: stops the oscillating ring.
• Ball and socket: levelling.