Geodetic Datum - Defining and Derived Parameters

Defining and Derived Parameters

Parameter Symbol
Semi-major axis a
Reciprocal of flattening 1/f

From a and f it is possible to derive the semi-minor axis b, first eccentricity e and second eccentricity e′ of the ellipsoid

Parameter Value
semi-minor axis b = a(1 − f)
First eccentricity squared e2 = 1 − b2/a2 = 2ff2
Second eccentricity squared e′2 = a2/b2 − 1 = f(2 − f)/(1 − f)2

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