def to2ab(self): # PYCHOK no cover
'''DEPRECATED, use property C{Nvector.philam}.
@return: A L{PhiLam2Tuple}C{(phi, lam)}.
'''
return n_xyz2philam(self.x, self.y, self.z)
def philam(self):
'''Get the (geodetic) lat-, longitude in C{radians} (L{PhiLam2Tuple}C{(phi, lam)}).
'''
if self._philam is None:
self._philam = n_xyz2philam(self.x, self.y, self.z)
return self._xnamed(self._philam)