geoid

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English[edit]

A map showing how the geoid (based on the EGM96 gravity model) compares with a theoretical perfect ellipsoid (the WGS84 reference ellipsoid) of the Earth. The red areas are higher and the blue areas lower than the idealized ellipsoid.

Etymology[edit]

geo- +‎ -oid, from German Geoid(geoid).

Pronunciation[edit]

Noun[edit]

geoid ‎(plural geoids)

  1. (geography (geodesy)) The shape that the surface of the oceans of the Earth would take under the influence of the Earth's gravity and rotation alone, disregarding other factors such as winds and tides; that is, a surface of constant gravitational potential at zero elevation.

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