| pe_n | |
Calculates the transverse radius of curvature at a point
double pe_n (double a, double e2, double phi);
| a, e2 | Semimajor axis and eccentricity squared of the spheroid |
| phi | Geographic latitude (measured in radians) of the point |
Transverse radius of curvature is the radius of curvature of the curve formed by a plane intersecting the spheroid at the point normal to the surface and also perpendicular to the meridian at the point.
Transverse radius of curvature at the point