const Ellipsoid GRS80Ellipsoid = {  // WGS84, ITRS, ETRS89
  .semiMajorAxis = L(6378137.0),
  .semiMinorAxis = L(6356752.3141)
};

const Ellipsoid Airy1830Ellipsoid = {  // OSGB36, National Grid
  .semiMajorAxis = L(6377563.396),
  .semiMinorAxis = L(6356256.909)
};

const Ellipsoid Airy1830ModifiedEllipsoid = {  // Ireland 65, Irish National Grid
  .semiMajorAxis = L(6377340.189),
  .semiMinorAxis = L(6356034.447)
};

const MapProjection NationalGridProj = {
  .centralMeridianScale = L( 0.9996012717),
  .trueOriginLatLon.lat = L(49.0),
  .trueOriginLatLon.lon = L(-2.0),
  .trueOriginEastingNorthing = {
    .e = L( 400000.0),
    .n = L(-100000.0) 
  }
};

const MapProjection IrishNationalGridProj = {
  .centralMeridianScale = L(1.000035),
  .trueOriginLatLon.lat = L(53.5),
  .trueOriginLatLon.lon = L(-8.0),
  .trueOriginEastingNorthing = {
    .e = L(200000.0),
    .n = L(250000.0) 
  }
};