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 = 2f − f2 |
| Second eccentricity squared | e′2 = a2/b2 − 1 = f(2 − f)/(1 − f)2 |
Read more about this topic: Geodetic Datum
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