SUBROUTINE iau_GC2GD ( N, XYZ, ELONG, PHI, HEIGHT, J ) *+ * - - - - - - - - - - * i a u _ G C 2 G D * - - - - - - - - - - * * Transform geocentric coordinates to geodetic using the specified * reference ellipsoid. * * This routine is part of the International Astronomical Union's * SOFA (Standards of Fundamental Astronomy) software collection. * * Status: canonical transformation. * * Given: * N i ellipsoid identifier (Note 1) * XYZ d(3) geocentric vector (Note 2) * * Returned: * ELONG d longitude (radians, east +ve, Note 3) * PHI d latitude (geodetic, radians, Note 3) * HEIGHT d height above ellipsoid (geodetic, Notes 2,3) * J i 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 number N has no significance outside the SOFA software. * * 2) The geocentric vector (XYZ, given) and height (HEIGHT, returned) * are in meters. * * 3) An error status J=-1 means that the identifier N is illegal. An * error status J=-2 is theoretically impossible. In all error * cases, all three results are set to -1D9. * * 4) The inverse transformation is performed in the routine iau_GD2GC. * * Called: * iau_EFORM Earth reference ellipsoids * iau_GC2GDE geocentric to geodetic transformation, general * * This revision: 2013 September 1 * * SOFA release 2015-02-09 * * Copyright (C) 2015 IAU SOFA Board. See notes at end. * *----------------------------------------------------------------------- IMPLICIT NONE INTEGER N DOUBLE PRECISION XYZ(3), ELONG, PHI, HEIGHT INTEGER J DOUBLE PRECISION A, F * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * Obtain reference ellipsoid parameters. CALL iau_EFORM ( N, A, F, J ) * If OK, transform x,y,z to longitude, geodetic latitude, height. IF ( J.EQ.0 ) THEN CALL iau_GC2GDE ( A, F, XYZ, ELONG, PHI, HEIGHT, J ) IF ( J.LT.0 ) J=-2 END IF * Deal with any errors. IF ( J.LT.0 ) THEN ELONG = -1D9 PHI = -1D9 HEIGHT = -1D9 END IF * Finished. *+---------------------------------------------------------------------- * * Copyright (C) 2015 * 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 * *----------------------------------------------------------------------- END