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author | William Joye <wjoye@cfa.harvard.edu> | 2017-12-08 18:59:21 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2017-12-08 18:59:21 (GMT) |
commit | 4432c8d7e1ccb371db03e13cdb5378fceaa5ad04 (patch) | |
tree | 52449d211eba99b24d2e4f6e66193f9511c60b59 /ast/erfa/gd2gc.c | |
parent | d8a2dbd825159e4a57ec0c6f4465f62be9e05111 (diff) | |
download | blt-4432c8d7e1ccb371db03e13cdb5378fceaa5ad04.zip blt-4432c8d7e1ccb371db03e13cdb5378fceaa5ad04.tar.gz blt-4432c8d7e1ccb371db03e13cdb5378fceaa5ad04.tar.bz2 |
upgrade AST
Diffstat (limited to 'ast/erfa/gd2gc.c')
-rw-r--r-- | ast/erfa/gd2gc.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/ast/erfa/gd2gc.c b/ast/erfa/gd2gc.c new file mode 100644 index 0000000..383c928 --- /dev/null +++ b/ast/erfa/gd2gc.c @@ -0,0 +1,142 @@ +#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. +** +*/ |