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## Copyright (C) 2018-2022 Philip Nienhuis
##
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSEll. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} wgs84Ellipsoid (@var{unit})
##
## Returns the parameters of the wgs84 ellipsoid. Argument @var{unit} is
## optional and if given, should be one of the units recognized by function
## validateLengthUnit().
##
## Example:
## @example
## >> E = wgs84Ellipsoid
## E =
##
## scalar structure containing the fields:
##
## Code = 7030
## Name = World Geodetic System 1984
## LengthUnit = meter
## SemimajorAxis = 6378137
## SemiminorAxis = 6.3568e+06
## InverseFlattening = 298.26
## Eccentricity = 0.081819
## Flattening = 0.0033528
## ThirdFlattening = 0.0016792
## MeanRadius = 6.3710e+06
## SurfaceArea = 5.1007e+14
## Volume = 1.0832e+21
## @end example
##
## A unit argument is also accepted:
## @example
## >> E = wgs84Ellipsoid ("km")
## E =
##
## scalar structure containing the fields:
##
## Code = 7030
## Name = World Geodetic System 1984
## LengthUnit = km
## SemimajorAxis = 6378.1
## SemiminorAxis = 6356.8
## InverseFlattening = 298.26
## Eccentricity = 0.081819
## Flattening = 0.0033528
## ThirdFlattening = 0.0016792
## MeanRadius = 6371.0
## SurfaceArea = 5.1007e+08
## Volume = 1.0832e+12
## @end example
## @seealso{referenceEllipsoid, validateLengthUnit}
## @end deftypefn
## Function supplied by anonymous contributor, see:
## https://savannah.gnu.org/patch/index.php?9634
function Ell = wgs84Ellipsoid (unit)
if ! nargin
unit = "meter";
end
Ell = referenceEllipsoid ("wgs84", unit);
endfunction
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