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#include "erfa.h"
int eraGd2gc ( int n, double elong, double phi, double height,
double xyz[3] )
/*
** - - - - - - - - -
** e r a G d 2 g c
** - - - - - - - - -
**
** Transform geodetic coordinates to geocentric using the specified
** reference ellipsoid.
**
** Given:
** n int ellipsoid identifier (Note 1)
** elong double longitude (radians, east +ve)
** phi double latitude (geodetic, radians, Note 3)
** height double height above ellipsoid (geodetic, Notes 2,3)
**
** Returned:
** xyz double[3] geocentric vector (Note 2)
**
** Returned (function value):
** int status: 0 = OK
** -1 = illegal identifier (Note 3)
** -2 = illegal case (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 height (height, given) and the geocentric vector (xyz,
** returned) are in meters.
**
** 3) No validation is performed on the arguments elong, phi and
** height. An error status -1 means that the identifier n is
** illegal. An error status -2 protects against cases that would
** lead to arithmetic exceptions. In all error cases, xyz is set
** to zeros.
**
** 4) The inverse transformation is performed in the function eraGc2gd.
**
** Called:
** eraEform Earth reference ellipsoids
** eraGd2gce geodetic to geocentric transformation, general
** eraZp zero p-vector
**
** 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 longitude, geodetic latitude, height to x,y,z. */
if ( j == 0 ) {
j = eraGd2gce ( a, f, elong, phi, height, xyz );
if ( j != 0 ) j = -2;
}
/* Deal with any errors. */
if ( j != 0 ) eraZp ( xyz );
/* 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.
**
*/
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