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## Copyright (C) 2020 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 PURPOSE. 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. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{x}, @var{y}, @var{z} =} enu2ecef (@var{n}, @var{e}, @var{d}, @var{lat}, @var{lon}, @var{alt})
## @deftypefnx {Function File} {@var{x}, @var{y}, @var{z} =} enu2ecef (@var{n}, @var{e}, @var{d}, @var{lat}, @var{lon}, @var{alt}, @var{spheroid})
## @deftypefnx {Function File} {@var{x}, @var{y}, @var{z} =} enu2ecef (@var{n}, @var{e}, @var{d}, @var{lat}, @var{lon}, @var{alt}, @var{spheroid}, @var{angleUnit})
## Convert local cartesian North, East, Down (NED) coordinates to Earth Centered
## Earth Fixed (ECEF) coordinates.
##
## Inputs:
## @itemize
## @item
## @var{n}, @var{e}, @var{d}: look angles and distance to target point
## (angle, angle, length). Length unit of @var{u} (height) is that of the
## used reference ellipsoid (see below). Can be scalars but vector or
## nD-array values are accepted if they have equal dimensions.
##
## @item
## @var{lat}, @var{lon}, @var{alt}: ellipsoid geodetic coordinates of
## observer location (angle, angle, length). Length unit of @var{alt}
## (height) is that of the used reference ellipsoid (see below). In case of
## multiple observer locations their numbers and dimensions should match those
## of the target points (i.e., one observer location for each target point).
##
## @item
## @var{spheroid}: referenceEllipsoid parameter struct, name or EPSG number;
## default is wgs84. Can be an empty string or empty numeric array ('[]') to
## indicate default value.
##
## @item
## @var{angleUnit}: string for angular units ('degrees' or 'radians',
## case-insensitive, just the first character will do). Default is 'degrees'.
## @end itemize
##
## Outputs:
## @itemize
## @item
## @var{x}, @var{y}, @var{z}: Earth Centered Earth Fixed (ECEF) coordinates.
## Length units are those of the used reference ellipsoid.
## @end itemize
##
## Examples
## @example
## [x, y, z] = ned2ecef (286.84, 186.28, -939.69, 42, -82, 200)
## x = 6.6093e+05
## y = -4.7014e+06
## z = 4.2466e+06
## @end example
##
## With radians
## @example
## [x, y, z] = ned2ecef (286.84, 186.28, -939.69, pi/4, -pi/2, 200, ...
## "wgs84", "radians")
## x = 186.28
## y = -4.5182e+06
## z = 4.4884e+06
## @end example
##
## @seealso{ecef2ned, ned2aer, ned2ecefv, ned2geodetic, referenceEllipsoid}
## @end deftypefn
## Function contributed by anonymous contributor, see:
## https://savannah.gnu.org/patch/index.php?9923
function [x, y, z] = ned2ecef (varargin)
spheroid = "";
angleUnit = "degrees";
if (nargin < 6 || nargin > 8)
print_usage();
elseif (nargin == 6)
## Assume lat, lon, alt, lat0, lon0, alt0 given
elseif (nargin == 7)
if (isnumeric (varargin{7}))
## EPSG spheroid code
spheroid = varargin{7};
elseif (ischar (varargin{7}))
if (! isempty (varargin{7}) && ismember (varargin{7}(1), {"r", "d"}))
angleUnit = varargin{7};
else
spheroid = varargin{7};
endif
elseif (isstruct (varargin{7}))
spheroid = varargin{7};
else
error ("ned2ecef: spheroid or angleUnit expected for arg. #7");
endif
elseif (nargin == 8)
spheroid = varargin{7};
angleUnit = varargin{8};
endif
n = varargin{1};
e = varargin{2};
u = varargin{3}; # Note multiplying by -1 makes it numeric so just use
# -u for the function
lat = varargin{4};
lon = varargin{5};
alt = varargin{6};
if (! isnumeric (e) || ! isreal (e) || ...
! isnumeric (n) || ! isreal (n) || ...
! isnumeric (u) || ! isreal (u) ||...
! isnumeric (lat) || ! isreal (lat) || ...
! isnumeric (lon) || ! isreal (lon) || ...
! isnumeric (alt) || ! isreal (alt))
error ("ned2ecef: numeric values expected for first 6 inputs.");
endif
if (! all (size (e) == size (n)) || ...
! all (size (n) == size (u))) ...
error ("ned2ecef: non-matching dimensions of inputs.");
endif
if (! (isscalar (lat) && isscalar (lon) && isscalar (alt)))
## Check if for each test point a matching observer point is given
if (! all (size (lat) == size (e)) || ...
! all (size (lon) == size (n)) || ...
! all (size (alt) == size (u)))
error ("ned2ecef: non-matching dimensions of observer points and \
target points");
endif
endif
if (isempty (spheroid))
E = wgs84Ellipsoid;
elseif (isstruct (spheroid))
E = spheroid;
elseif (ischar (spheroid))
E = referenceEllipsoid (spheroid);
endif
[x, y, z] = enu2ecef (e, n, -u, lat, lon, alt, E, angleUnit);
endfunction
%!test
%! [x, y, z] = ned2ecef (286.84, 186.28, -939.69, 42, -82, 200);
%! assert ([x, y, z], [6.6093019515e5, -4.70142422216e6, 4.24657960122e6], 10e-6)
%!test
%! [x3, y3, z3] = ned2ecef (286.84, 186.28, -939.69, 0.733038285837618, -1.43116998663535, 200, "", "rad");
%! assert ([x3, y3, z3], [660.93019e3, -4701.42422e3, 4246.5796e3],10e-3)
%!test
%! [a, b, c] = ned2ecef (-923083.2, 355601.3, -1041016.4, 45.9132, 36.7484, 1877753.2);
%! assert ([a, b, c], [5507528.8891, 4556224.1399, 6012820.7522], 1e-4)
%!test
%! [x,y,z] = ned2ecef( 1334.3, -2544.4, 360.0, 44.532, -72.782, 1699);
%! assert ([x, y, z], [1345659.962, -4350890.986, 4452313.969], 1e-3);
%!error <numeric> ned2ecef("s", 25, 1e3, 0, 0, 0)
%!error <numeric> ned2ecef(3i, 25, 1e3, 0, 0, 0)
%!error <numeric> ned2ecef(33, "s", 1e3, 0, 0, 0)
%!error <numeric> ned2ecef(33, 3i, 1e3, 0, 0, 0)
%!error <numeric> ned2ecef(33, 25, "s", 0, 0, 0)
%!error <numeric> ned2ecef(33, 25, 3i, 0, 0, 0)
%!error <numeric> ned2ecef(33, 25, 1e3, "s", 0, 0)
%!error <numeric> ned2ecef(33, 25, 1e3, 3i, 0, 0)
%!error <numeric> ned2ecef(33, 25, 1e3, 0, "s", 0)
%!error <numeric> ned2ecef(33, 25, 1e3, 0, 3i, 0)
%!error <numeric> ned2ecef(33, 25, 1e3, 0, 0, "s")
%!error <numeric> ned2ecef(33, 25, 1e3, 0, 0, 3i)
%!error <non-matching> ned2ecef ([1 1], [2 2]', [3 3], 4, 5, 6)
%!error <non-matching> ned2ecef ([1 1], [2 2], [33], 4, 5, 6)
%!error <non-matching> ned2ecef ([1 1], [2 2], [3 3], [4 4], 5, 6)
%!error <non-matching> ned2ecef ([1 1], [2 2], [3 3], 4, [5 5], 6)
%!error <non-matching> ned2ecef ([1 1], [2 2], [3 3], 4, 5, [6 6])
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