definition of the second parameter that defines the shape of a biaxial ellipsoid, or the third parameter that defines a triaxial ellipsoid<br/>Note: A biaxial ellipsoid requires two defining parameters: a semi-major axis and inverse flattening or a semi-major axis and a semi-minor axis. When the reference body is a sphere rather than an ellipsoid, only a single defining parameter is required, namely the radius of the sphere; in that case, the semi-major axis “degenerates” into the radius of the sphere.<br/>