#include "sofa.h" int iauGc2gd ( int n, double xyz[3], double *elong, double *phi, double *height ) /* ** - - - - - - - - - ** i a u G c 2 g d ** - - - - - - - - - ** ** Transform geocentric coordinates to geodetic using the specified ** reference ellipsoid. ** ** This function is part of the International Astronomical Union's ** SOFA (Standards of Fundamental Astronomy) software collection. ** ** Status: canonical transformation. ** ** 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 WGS84 ** 2 GRS80 ** 3 WGS72 ** ** The n value has no significance outside the SOFA software. For ** convenience, symbols WGS84 etc. are defined in sofam.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 iauGd2gc. ** ** Called: ** iauEform Earth reference ellipsoids ** iauGc2gde geocentric to geodetic transformation, general ** ** This revision: 2013 September 1 ** ** SOFA release 2013-12-02 ** ** Copyright (C) 2013 IAU SOFA Board. See notes at end. */ { int j; double a, f; /* Obtain reference ellipsoid parameters. */ j = iauEform ( n, &a, &f ); /* If OK, transform x,y,z to longitude, geodetic latitude, height. */ if ( j == 0 ) { j = iauGc2gde ( 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 ** Standards Of Fundamental Astronomy Board ** of the International Astronomical Union. ** ** ===================== ** SOFA Software License ** ===================== ** ** NOTICE TO USER: ** ** BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND ** CONDITIONS WHICH APPLY TO ITS USE. ** ** 1. The Software is owned by the IAU SOFA Board ("SOFA"). ** ** 2. Permission is granted to anyone to use the SOFA software for any ** purpose, including commercial applications, free of charge and ** without payment of royalties, subject to the conditions and ** restrictions listed below. ** ** 3. You (the user) may copy and distribute SOFA source code to others, ** and use and adapt its code and algorithms in your own software, ** on a world-wide, royalty-free basis. That portion of your ** distribution that does not consist of intact and unchanged copies ** of SOFA source code files is a "derived work" that must comply ** with the following requirements: ** ** a) Your work shall be marked or carry a statement that it ** (i) uses routines and computations derived by you from ** software provided by SOFA under license to you; and ** (ii) does not itself constitute software provided by and/or ** endorsed by SOFA. ** ** b) The source code of your derived work must contain descriptions ** of how the derived work is based upon, contains and/or differs ** from the original SOFA software. ** ** c) The names of all routines in your derived work shall not ** include the prefix "iau" or "sofa" or trivial modifications ** thereof such as changes of case. ** ** d) The origin of the SOFA components of your derived work must ** not be misrepresented; you must not claim that you wrote the ** original software, nor file a patent application for SOFA ** software or algorithms embedded in the SOFA software. ** ** e) These requirements must be reproduced intact in any source ** distribution and shall apply to anyone to whom you have ** granted a further right to modify the source code of your ** derived work. ** ** Note that, as originally distributed, the SOFA software is ** intended to be a definitive implementation of the IAU standards, ** and consequently third-party modifications are discouraged. All ** variations, no matter how minor, must be explicitly marked as ** such, as explained above. ** ** 4. You shall not cause the SOFA software to be brought into ** disrepute, either by misuse, or use for inappropriate tasks, or ** by inappropriate modification. ** ** 5. The SOFA software is provided "as is" and SOFA makes no warranty ** as to its use or performance. SOFA does not and cannot warrant ** the performance or results which the user may obtain by using the ** SOFA software. SOFA makes no warranties, express or implied, as ** to non-infringement of third party rights, merchantability, or ** fitness for any particular purpose. In no event will SOFA be ** liable to the user for any consequential, incidental, or special ** damages, including any lost profits or lost savings, even if a ** SOFA representative has been advised of such damages, or for any ** claim by any third party. ** ** 6. The provision of any version of the SOFA software under the terms ** and conditions specified herein does not imply that future ** versions will also be made available under the same terms and ** conditions. * ** In any published work or commercial product which uses the SOFA ** software directly, acknowledgement (see www.iausofa.org) is ** appreciated. ** ** Correspondence concerning SOFA software should be addressed as ** follows: ** ** By email: sofa@ukho.gov.uk ** By post: IAU SOFA Center ** HM Nautical Almanac Office ** UK Hydrographic Office ** Admiralty Way, Taunton ** Somerset, TA1 2DN ** United Kingdom ** **--------------------------------------------------------------------*/ }