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Diffstat (limited to 'ast/erfa/gd2gce.c')
| -rw-r--r-- | ast/erfa/gd2gce.c | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/ast/erfa/gd2gce.c b/ast/erfa/gd2gce.c deleted file mode 100644 index 52b9f0e..0000000 --- a/ast/erfa/gd2gce.c +++ /dev/null @@ -1,146 +0,0 @@ -#include "erfa.h" - -int eraGd2gce ( double a, double f, double elong, double phi, - double height, double xyz[3] ) -/* -** - - - - - - - - - - -** e r a G d 2 g c e -** - - - - - - - - - - -** -** Transform geodetic coordinates to geocentric for a reference -** ellipsoid of specified form. -** -** Given: -** a double equatorial radius (Notes 1,4) -** f double flattening (Notes 2,4) -** elong double longitude (radians, east +ve) -** phi double latitude (geodetic, radians, Note 4) -** height double height above ellipsoid (geodetic, Notes 3,4) -** -** Returned: -** xyz double[3] geocentric vector (Note 3) -** -** Returned (function value): -** int status: 0 = OK -** -1 = illegal case (Note 4) -** Notes: -** -** 1) The equatorial radius, a, can be in any units, but meters is -** the conventional choice. -** -** 2) The flattening, f, is (for the Earth) a value around 0.00335, -** i.e. around 1/298. -** -** 3) The equatorial radius, a, and the height, height, must be -** given in the same units, and determine the units of the -** returned geocentric vector, xyz. -** -** 4) No validation is performed on individual arguments. The error -** status -1 protects against (unrealistic) cases that would lead -** to arithmetic exceptions. If an error occurs, xyz is unchanged. -** -** 5) The inverse transformation is performed in the function -** eraGc2gde. -** -** 6) The transformation for a standard ellipsoid (such as ERFA_WGS84) can -** more conveniently be performed by calling eraGd2gc, which uses a -** numerical code to identify the required a and f values. -** -** References: -** -** Green, R.M., Spherical Astronomy, Cambridge University Press, -** (1985) Section 4.5, p96. -** -** Explanatory Supplement to the Astronomical Almanac, -** P. Kenneth Seidelmann (ed), University Science Books (1992), -** Section 4.22, p202. -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double sp, cp, w, d, ac, as, r; - - -/* Functions of geodetic latitude. */ - sp = sin(phi); - cp = cos(phi); - w = 1.0 - f; - w = w * w; - d = cp*cp + w*sp*sp; - if ( d <= 0.0 ) return -1; - ac = a / sqrt(d); - as = w * ac; - -/* Geocentric vector. */ - r = (ac + height) * cp; - xyz[0] = r * cos(elong); - xyz[1] = r * sin(elong); - xyz[2] = (as + height) * sp; - -/* Success. */ - return 0; - -} -/*---------------------------------------------------------------------- -** -** -** 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. -** -*/ |