static _getEllipsoid(imageryLayer) {
    const ellipsoid =
      imageryLayer.imageryProvider.tilingScheme.projection.ellipsoid;
    return ellipsoid;
  }
Returns the ellipsoid of the given imagery layer.

This only exists to hide a train wreck

@param {ImageryLayer} imageryLayer The imagery layer
@returns {Ellipsoid} The ellipsoid
@private