Reference Ellipsoid

In geodesy, a reference ellipsoid is a mathematically-defined surface that approximates the geoid, the truer figure of the Earth, or other planetary body. Because of their relative simplicity, reference ellipsoids are used as a preferred surface on which geodetic network computations are performed and point coordinates such as latitude, longitude, and elevation are defined.

Read more about Reference Ellipsoid:  Ellipsoid Parameters, Coordinates, Historical Earth Ellipsoids, Ellipsoids For Other Planetary Bodies

Famous quotes containing the word reference:

    If we define a sign as an exact reference, it must include symbol because a symbol is an exact reference too. The difference seems to be that a sign is an exact reference to something definite and a symbol an exact reference to something indefinite.
    William York Tindall (1903–1981)