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## Copyright (C) 2009, 2010, José Luis García Pallero, <jgpallero@gmail.com>
##
## This file is part of OctPROJ.
##
## OctPROJ 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File}{[@var{lon},@var{lat}] =}op_inv(@var{X},@var{Y},@var{params})
##
## This function unprojects cartesian projected coordinates (in a defined
## cartographic projection) into geodetic coordinates using the PROJ.4 function
## pj_inv().
##
## @var{X} contains the X projected coordinates.
## @var{Y} contains the Y projected coordinates.
## @var{params} is a text string containing the projection parameters in PROJ.4
## format.
##
## @var{X} or @var{Y} can be scalars, vectors or matrices with equal dimensions.
##
## @var{lon} is the geodetic longitude, in radians.
## @var{lat} is the geodetic latitude, in radians.
##
## If a projection error occurs, the resultant coordinates for the affected
## points have both Inf value and a warning message is emitted (one for each
## erroneous point).
## @seealso{op_fwd, op_transform}
## @end deftypefn
function [lon,lat] = op_inv(X,Y,params)
try
functionName = 'op_inv';
argumentNumber = 3;
%*******************************************************************************
%NUMBER OF INPUT ARGUMENTS CHECKING
%*******************************************************************************
%number of input arguments checking
if nargin~=argumentNumber
error(['Incorrect number of input arguments (%d)\n\t ',...
'Correct number of input arguments = %d'],...
nargin,argumentNumber);
end
%*******************************************************************************
%INPUT ARGUMENTS CHECKING
%*******************************************************************************
%checking input arguments
[X,Y,rowWork,colWork] = checkInputArguments(X,Y,params);
catch
%error message
error('\n\tIn function %s:\n\t -%s ',functionName,lasterr);
end
%*******************************************************************************
%COMPUTATION
%*******************************************************************************
try
%calling oct function
[lon,lat] = _op_inv(X,Y,params);
%convert output vectors in matrices of adequate size
lon = reshape(lon,rowWork,colWork);
lat = reshape(lat,rowWork,colWork);
catch
%error message
error('\n\tIn function %s:\n\tIn function %s ',functionName,lasterr);
end
%*******************************************************************************
%AUXILIARY FUNCTION
%*******************************************************************************
function [a,b,rowWork,colWork] = checkInputArguments(a,b,params)
%a must be matrix type
if ismatrix(a)
%a dimensions
[rowA,colA] = size(a);
else
error('The first input argument is not numeric');
end
%b must be matrix type
if ismatrix(b)
%b dimensions
[rowB,colB] = size(b);
else
error('The second input argument is not numeric');
end
%checking a and b dimensions
if (rowA~=rowB)||(colA~=colB)
error('The dimensions of input arguments are not the same');
else
%working dimensions
rowWork = rowA;
colWork = colA;
%convert a and b in column vectors
a = reshape(a,rowWork*colWork,1);
b = reshape(b,rowWork*colWork,1);
end
%params must be a text string
if ~ischar(params)
error('The third input argument is not a text string');
end
%*****END OF FUNCIONS*****
%*****FUNCTION TESTS*****
%!test
%! [lon,lat]=op_inv(255466.98,4765182.93,'+proj=utm +lon_0=3w +ellps=GRS80');
%! assert(lon*180/pi,-6,1e-7)
%! assert(lat*180/pi,43,1e-7)
%!error(op_inv)
%!error(op_inv(1,2,3,4))
%!error(op_inv('string',2,3))
%!error(op_inv(1,'string',3))
%!error(op_inv(1,2,3))
%!error(op_inv([1 1;2 2],2,'+proj=utm +lon_0=3w +ellps=GRS80'))
%!error(op_inv(1,[2 2;3 3],'+proj=utm +lon_0=3w +ellps=GRS80'))
%*****END OF TESTS*****

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