SUBROUTINE iau_GD2GC ( N, ELONG, PHI, HEIGHT, XYZ, J ) *+ * - - - - - - - - - - * i a u _ G D 2 G C * - - - - - - - - - - * * Transform geodetic coordinates to geocentric 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) * ELONG d longitude (radians, east +ve) * PHI d latitude (geodetic, radians, Note 3) * HEIGHT d height above ellipsoid (geodetic, Notes 2,3) * * Returned: * XYZ d(3) geocentric vector (Note 2) * J i 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 WGS84 * 2 GRS80 * 3 WGS72 * * The number N has no significance outside the SOFA software. * * 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 J=-1 means that the identifier N is illegal. An * error status J=-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 routine iau_GC2GD. * * Called: * iau_EFORM Earth reference ellipsoids * iau_GD2GCE geodetic to geocentric transformation, general * iau_ZP zero p-vector * * This revision: 2010 January 18 * * SOFA release 2021-01-25 * * Copyright (C) 2021 IAU SOFA Board. See notes at end. * *----------------------------------------------------------------------- IMPLICIT NONE INTEGER N DOUBLE PRECISION ELONG, PHI, HEIGHT, XYZ(3) INTEGER J DOUBLE PRECISION A, F * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * Obtain reference ellipsoid parameters. CALL iau_EFORM ( N, A, F, J ) * If OK, transform longitude, geodetic latitude, height to x,y,z. IF ( J.EQ.0 ) THEN CALL iau_GD2GCE ( A, F, ELONG, PHI, HEIGHT, XYZ, J ) IF ( J.NE.0 ) J=-2 END IF * Deal with any errors. IF ( J.NE.0 ) CALL iau_ZP ( XYZ ) * Finished. *+---------------------------------------------------------------------- * * Copyright (C) 2021 * 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