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Diffstat (limited to 'ast/erfa/gc2gd.c')
-rw-r--r-- | ast/erfa/gc2gd.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/ast/erfa/gc2gd.c b/ast/erfa/gc2gd.c new file mode 100644 index 0000000..385e7d5 --- /dev/null +++ b/ast/erfa/gc2gd.c @@ -0,0 +1,143 @@ +#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. +** +*/ |