| pe_phi_to_eta | |
Calculates the reduced latitude from the geodetic latitude
double pe_phi_to_eta (double e2, double phi);
| e2 | Eccentricity squared of the spheroid |
| phi | Geodetic latitude (measured in radians) of the point |
The reduced or parametric latitude is a latitude on a sphere of radius a (where a is the semimajor axis of a spheroid). The reduced latitude is the angle formed between the equatorial plane and a line from the center of the sphere to a point on the sphere that is at the same distance from the polar axis as the geodetic latitude.
Reduced latitude (measured in radians) of the point