# Method Geography.Position()->set_ellipsoid()

Method set_ellipsoid

  ``bool` set_ellipsoid(`string` `name`)`
  ``bool` set_ellipsoid(`float` `equatorial_radius`, `float` `polar_radius`)`

Description

  Sets the equatorial and polar radius to the provided values. A name can also be provided, in which case the radius will be looked up in the ellipsoid mapping. The function returns 1 upon success, 0 on failure.

  ``"Airy 1830"``
  ``"ATS77"``
  ``"Australian National"``
  ``"Bessel 1841"``
  ``"Bessel 1841 Namibia"``
  ``"Clarke 1866"``
  ``"Clarke 1880"``
  ``"Everest"``
  ``"Everest 1830"``
  ``"Everest 1848"``
  ``"Everest 1856"``
  ``"Everest 1869"``
  ``"Everest Pakistan"``
  ``"Fisher 1960"``
  ``"Fisher 1968"``
  ``"G R S 1967"``
  ``"G R S 1975"``
  ``"G R S 1980"``
  ``"Helmert 1906"``
  ``"Hough 1956"``
  ``"Indonesian 1974"``
  ``"Krassovsky 1940"``
  ``"Mercury"``
  ``"Modified Airy"``
  ``"Modified Fisher 1960"``
  ``"New International 1967"``
  ``"SGS 85"``
  ``"South American 1969"``
  ``"Sphere"``
  ``"WGS 60"``
  ``"WGS 66"``
  ``"WGS 72"``
  ``"WGS 84"``

Note

  The longitude and lattitude are not converted to the new ellipsoid.