1 files changed, 143 insertions, 0 deletions
diff --git a/ast/erfa/gc2gd.c b/ast/erfa/gc2gd.c
new file mode 100644
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+++ b/ast/erfa/gc2gd.c
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+#include "erfa.h"
+
+int eraGc2gd ( int n, double xyz[3],
+               double *elong, double *phi, double *height )
+/*
+**  - - - - - - - - -
+**   e r a G c 2 g d
+**  - - - - - - - - -
+**
+**  Transform geocentric coordinates to geodetic using the specified
+**  reference ellipsoid.
+**
+**  Given:
+**     n       int        ellipsoid identifier (Note 1)
+**     xyz     double[3]  geocentric vector (Note 2)
+**
+**  Returned:
+**     elong   double     longitude (radians, east +ve, Note 3)
+**     phi     double     latitude (geodetic, radians, Note 3)
+**     height  double     height above ellipsoid (geodetic, Notes 2,3)
+**
+**  Returned (function value):
+**            int         status:  0 = OK
+**                                -1 = illegal identifier (Note 3)
+**                                -2 = internal error (Note 3)
+**
+**  Notes:
+**
+**  1) The identifier n is a number that specifies the choice of
+**     reference ellipsoid.  The following are supported:
+**
+**        n    ellipsoid
+**
+**        1     ERFA_WGS84
+**        2     ERFA_GRS80
+**        3     ERFA_WGS72
+**
+**     The n value has no significance outside the ERFA software.  For
+**     convenience, symbols ERFA_WGS84 etc. are defined in erfam.h.
+**
+**  2) The geocentric vector (xyz, given) and height (height, returned)
+**     are in meters.
+**
+**  3) An error status -1 means that the identifier n is illegal.  An
+**     error status -2 is theoretically impossible.  In all error cases,
+**     all three results are set to -1e9.
+**
+**  4) The inverse transformation is performed in the function eraGd2gc.
+**
+**  Called:
+**     eraEform     Earth reference ellipsoids
+**     eraGc2gde    geocentric to geodetic transformation, general
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+   int j;
+   double a, f;
+
+
+/* Obtain reference ellipsoid parameters. */
+   j = eraEform ( n, &a, &f );
+
+/* If OK, transform x,y,z to longitude, geodetic latitude, height. */
+   if ( j == 0 ) {
+      j = eraGc2gde ( a, f, xyz, elong, phi, height );
+      if ( j < 0 ) j = -2;
+   }
+
+/* Deal with any errors. */
+   if ( j < 0 ) {
+      *elong = -1e9;
+      *phi = -1e9;
+      *height = -1e9;
+   }
+
+/* Return the status. */
+   return j;
+
+}
+/*----------------------------------------------------------------------
+**  
+**  
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  All rights reserved.
+**  
+**  This library is derived, with permission, from the International
+**  Astronomical Union's "Standards of Fundamental Astronomy" library,
+**  available from http://www.iausofa.org.
+**  
+**  The ERFA version is intended to retain identical functionality to
+**  the SOFA library, but made distinct through different function and
+**  file names, as set out in the SOFA license conditions.  The SOFA
+**  original has a role as a reference standard for the IAU and IERS,
+**  and consequently redistribution is permitted only in its unaltered
+**  state.  The ERFA version is not subject to this restriction and
+**  therefore can be included in distributions which do not support the
+**  concept of "read only" software.
+**  
+**  Although the intent is to replicate the SOFA API (other than
+**  replacement of prefix names) and results (with the exception of
+**  bugs;  any that are discovered will be fixed), SOFA is not
+**  responsible for any errors found in this version of the library.
+**  
+**  If you wish to acknowledge the SOFA heritage, please acknowledge
+**  that you are using a library derived from SOFA, rather than SOFA
+**  itself.
+**  
+**  
+**  TERMS AND CONDITIONS
+**  
+**  Redistribution and use in source and binary forms, with or without
+**  modification, are permitted provided that the following conditions
+**  are met:
+**  
+**  1 Redistributions of source code must retain the above copyright
+**    notice, this list of conditions and the following disclaimer.
+**  
+**  2 Redistributions in binary form must reproduce the above copyright
+**    notice, this list of conditions and the following disclaimer in
+**    the documentation and/or other materials provided with the
+**    distribution.
+**  
+**  3 Neither the name of the Standards Of Fundamental Astronomy Board,
+**    the International Astronomical Union nor the names of its
+**    contributors may be used to endorse or promote products derived
+**    from this software without specific prior written permission.
+**  
+**  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+**  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+**  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+**  FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+**  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+**  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+**  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+**  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+**  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+**  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+**  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+**  POSSIBILITY OF SUCH DAMAGE.
+**  
+*/