pyinterp.core.geodetic.Spheroid.authalic_radius¶ Spheroid.authalic_radius(self: pyinterp.core.geodetic._Spheroid) → float¶ Gets the authalic radius. Returns: \(R_2=\sqrt{\frac{a^2+\frac{ab^2}{E}ln(\frac{a + E}{b})}{2}}\)