File Coverage

erfasrc/src/gd2gce.c

Criterion	Covered	Total	%
statement	14	14	100.0
branch	1	2	50.0
condition			n/a
subroutine			n/a
pod			n/a
total	15	16	93.7

line	stmt	bran	code
1			#include "erfa.h"
2
3	11		int eraGd2gce ( double a, double f, double elong, double phi,
4			double height, double xyz[3] )
5			/*
6			** - - - - - - - - - -
7			** e r a G d 2 g c e
8			** - - - - - - - - - -
9			**
10			** Transform geodetic coordinates to geocentric for a reference
11			** ellipsoid of specified form.
12			**
13			** Given:
14			** a double equatorial radius (Notes 1,4)
15			** f double flattening (Notes 2,4)
16			** elong double longitude (radians, east +ve)
17			** phi double latitude (geodetic, radians, Note 4)
18			** height double height above ellipsoid (geodetic, Notes 3,4)
19			**
20			** Returned:
21			** xyz double[3] geocentric vector (Note 3)
22			**
23			** Returned (function value):
24			** int status: 0 = OK
25			** -1 = illegal case (Note 4)
26			** Notes:
27			**
28			** 1) The equatorial radius, a, can be in any units, but meters is
29			** the conventional choice.
30			**
31			** 2) The flattening, f, is (for the Earth) a value around 0.00335,
32			** i.e. around 1/298.
33			**
34			** 3) The equatorial radius, a, and the height, height, must be
35			** given in the same units, and determine the units of the
36			** returned geocentric vector, xyz.
37			**
38			** 4) No validation is performed on individual arguments. The error
39			** status -1 protects against (unrealistic) cases that would lead
40			** to arithmetic exceptions. If an error occurs, xyz is unchanged.
41			**
42			** 5) The inverse transformation is performed in the function
43			** eraGc2gde.
44			**
45			** 6) The transformation for a standard ellipsoid (such as ERFA_WGS84) can
46			** more conveniently be performed by calling eraGd2gc, which uses a
47			** numerical code to identify the required a and f values.
48			**
49			** References:
50			**
51			** Green, R.M., Spherical Astronomy, Cambridge University Press,
52			** (1985) Section 4.5, p96.
53			**
54			** Explanatory Supplement to the Astronomical Almanac,
55			** P. Kenneth Seidelmann (ed), University Science Books (1992),
56			** Section 4.22, p202.
57			**
58			** Copyright (C) 2013-2020, NumFOCUS Foundation.
59			** Derived, with permission, from the SOFA library. See notes at end of file.
60			*/
61			{
62			double sp, cp, w, d, ac, as, r;
63
64
65			/* Functions of geodetic latitude. */
66	11		sp = sin(phi);
67	11		cp = cos(phi);
68	11		w = 1.0 - f;
69	11		w = w * w;
70	11		d = cpcp + wsp*sp;
71	11	50	if ( d <= 0.0 ) return -1;
72	11		ac = a / sqrt(d);
73	11		as = w * ac;
74
75			/* Geocentric vector. */
76	11		r = (ac + height) * cp;
77	11		xyz[0] = r * cos(elong);
78	11		xyz[1] = r * sin(elong);
79	11		xyz[2] = (as + height) * sp;
80
81			/* Success. */
82	11		return 0;
83
84			}
85			/*----------------------------------------------------------------------
86			**
87			**
88			** Copyright (C) 2013-2020, NumFOCUS Foundation.
89			** All rights reserved.
90			**
91			** This library is derived, with permission, from the International
92			** Astronomical Union's "Standards of Fundamental Astronomy" library,
93			** available from http://www.iausofa.org.
94			**
95			** The ERFA version is intended to retain identical functionality to
96			** the SOFA library, but made distinct through different function and
97			** file names, as set out in the SOFA license conditions. The SOFA
98			** original has a role as a reference standard for the IAU and IERS,
99			** and consequently redistribution is permitted only in its unaltered
100			** state. The ERFA version is not subject to this restriction and
101			** therefore can be included in distributions which do not support the
102			** concept of "read only" software.
103			**
104			** Although the intent is to replicate the SOFA API (other than
105			** replacement of prefix names) and results (with the exception of
106			** bugs; any that are discovered will be fixed), SOFA is not
107			** responsible for any errors found in this version of the library.
108			**
109			** If you wish to acknowledge the SOFA heritage, please acknowledge
110			** that you are using a library derived from SOFA, rather than SOFA
111			** itself.
112			**
113			**
114			** TERMS AND CONDITIONS
115			**
116			** Redistribution and use in source and binary forms, with or without
117			** modification, are permitted provided that the following conditions
118			** are met:
119			**
120			** 1 Redistributions of source code must retain the above copyright
121			** notice, this list of conditions and the following disclaimer.
122			**
123			** 2 Redistributions in binary form must reproduce the above copyright
124			** notice, this list of conditions and the following disclaimer in
125			** the documentation and/or other materials provided with the
126			** distribution.
127			**
128			** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
129			** the International Astronomical Union nor the names of its
130			** contributors may be used to endorse or promote products derived
131			** from this software without specific prior written permission.
132			**
133			** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
134			** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
135			** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
136			** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
137			** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
138			** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
139			** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
140			** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
141			** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
142			** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
143			** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
144			** POSSIBILITY OF SUCH DAMAGE.
145			**
146			*/