source: trunk/FACT++/erfa/src/gd2gc.c@ 18679

Last change on this file since 18679 was 18348, checked in by tbretz, 9 years ago
File size: 5.2 KB
Line 
1#include "erfa.h"
2
3int eraGd2gc ( int n, double elong, double phi, double height,
4 double xyz[3] )
5/*
6** - - - - - - - - -
7** e r a G d 2 g c
8** - - - - - - - - -
9**
10** Transform geodetic coordinates to geocentric using the specified
11** reference ellipsoid.
12**
13** Given:
14** n int ellipsoid identifier (Note 1)
15** elong double longitude (radians, east +ve)
16** phi double latitude (geodetic, radians, Note 3)
17** height double height above ellipsoid (geodetic, Notes 2,3)
18**
19** Returned:
20** xyz double[3] geocentric vector (Note 2)
21**
22** Returned (function value):
23** int status: 0 = OK
24** -1 = illegal identifier (Note 3)
25** -2 = illegal case (Note 3)
26**
27** Notes:
28**
29** 1) The identifier n is a number that specifies the choice of
30** reference ellipsoid. The following are supported:
31**
32** n ellipsoid
33**
34** 1 ERFA_WGS84
35** 2 ERFA_GRS80
36** 3 ERFA_WGS72
37**
38** The n value has no significance outside the ERFA software. For
39** convenience, symbols ERFA_WGS84 etc. are defined in erfam.h.
40**
41** 2) The height (height, given) and the geocentric vector (xyz,
42** returned) are in meters.
43**
44** 3) No validation is performed on the arguments elong, phi and
45** height. An error status -1 means that the identifier n is
46** illegal. An error status -2 protects against cases that would
47** lead to arithmetic exceptions. In all error cases, xyz is set
48** to zeros.
49**
50** 4) The inverse transformation is performed in the function eraGc2gd.
51**
52** Called:
53** eraEform Earth reference ellipsoids
54** eraGd2gce geodetic to geocentric transformation, general
55** eraZp zero p-vector
56**
57** Copyright (C) 2013-2015, NumFOCUS Foundation.
58** Derived, with permission, from the SOFA library. See notes at end of file.
59*/
60{
61 int j;
62 double a, f;
63
64/* Obtain reference ellipsoid parameters. */
65 j = eraEform ( n, &a, &f );
66
67/* If OK, transform longitude, geodetic latitude, height to x,y,z. */
68 if ( j == 0 ) {
69 j = eraGd2gce ( a, f, elong, phi, height, xyz );
70 if ( j != 0 ) j = -2;
71 }
72
73/* Deal with any errors. */
74 if ( j != 0 ) eraZp ( xyz );
75
76/* Return the status. */
77 return j;
78
79}
80/*----------------------------------------------------------------------
81**
82**
83** Copyright (C) 2013-2015, NumFOCUS Foundation.
84** All rights reserved.
85**
86** This library is derived, with permission, from the International
87** Astronomical Union's "Standards of Fundamental Astronomy" library,
88** available from http://www.iausofa.org.
89**
90** The ERFA version is intended to retain identical functionality to
91** the SOFA library, but made distinct through different function and
92** file names, as set out in the SOFA license conditions. The SOFA
93** original has a role as a reference standard for the IAU and IERS,
94** and consequently redistribution is permitted only in its unaltered
95** state. The ERFA version is not subject to this restriction and
96** therefore can be included in distributions which do not support the
97** concept of "read only" software.
98**
99** Although the intent is to replicate the SOFA API (other than
100** replacement of prefix names) and results (with the exception of
101** bugs; any that are discovered will be fixed), SOFA is not
102** responsible for any errors found in this version of the library.
103**
104** If you wish to acknowledge the SOFA heritage, please acknowledge
105** that you are using a library derived from SOFA, rather than SOFA
106** itself.
107**
108**
109** TERMS AND CONDITIONS
110**
111** Redistribution and use in source and binary forms, with or without
112** modification, are permitted provided that the following conditions
113** are met:
114**
115** 1 Redistributions of source code must retain the above copyright
116** notice, this list of conditions and the following disclaimer.
117**
118** 2 Redistributions in binary form must reproduce the above copyright
119** notice, this list of conditions and the following disclaimer in
120** the documentation and/or other materials provided with the
121** distribution.
122**
123** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
124** the International Astronomical Union nor the names of its
125** contributors may be used to endorse or promote products derived
126** from this software without specific prior written permission.
127**
128** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
129** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
130** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
131** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
132** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
133** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
134** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
135** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
136** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
137** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
138** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
139** POSSIBILITY OF SUCH DAMAGE.
140**
141*/
Note: See TracBrowser for help on using the repository browser.