Equipotential surface

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The starting point A of a route is located at the reference surface of levelling (for example on the geoid), which is an equipotential surface [W.
Geodesy takes several reference surfaces of representation of the Earth's shape, a physical shape known as geoid and a geometrical-mathematical shape known as ellipsoid; the geoid is the equipotential surface most similar to the sea level mean at rest and it is represented by W = [W.
The dowsing rods align themselves perpendicular to the equipotential surface.