Oblate spheroid equation(c<a)
A spheroid, or ellipsoid of revolution is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters.An oblate spheroid is a rotationally symmetric ellipsoid having a polar axis shorter than the diameter of the equatorial circle whose plane bisects it (like a lentil).
|x||X-coordinate of the point (dimensionless)|
|a||Semi-major axis ( the equatorial radius of the spheroid) (dimensionless)|
|y||Y-Coordinate of the point (ordinate) (dimensionless)|
|b||Semi-minor axis (dimensionless)|
|z||Z-coordinate of the point (dimensionless)|
|c||Distance from centre to pole along the symmetry axis (c<a) (dimensionless)|