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/* |
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*+ |
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* Name: |
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* palGeoc |
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* Purpose: |
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* Convert geodetic position to geocentric |
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* Language: |
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* Starlink ANSI C |
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* Type of Module: |
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* Library routine |
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* Invocation: |
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* void palGeoc( double p, double h, double * r, double *z ); |
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* Arguments: |
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* p = double (Given) |
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* latitude (radians) |
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* h = double (Given) |
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* height above reference spheroid (geodetic, metres) |
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* r = double * (Returned) |
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* distance from Earth axis (AU) |
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* z = double * (Returned) |
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* distance from plane of Earth equator (AU) |
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* Description: |
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* Convert geodetic position to geocentric. |
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* Authors: |
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* PTW: Patrick T. Wallace |
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* TIMJ: Tim Jenness (JAC, Hawaii) |
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* {enter_new_authors_here} |
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36
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* Notes: |
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* - Geocentric latitude can be obtained by evaluating atan2(z,r) |
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38
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* - Uses WGS84 reference ellipsoid and calls eraGd2gc |
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* History: |
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* 2012-03-01 (TIMJ): |
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* Initial version moved from palOne2One |
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* Adapted with permission from the Fortran SLALIB library. |
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* {enter_further_changes_here} |
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* Copyright: |
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* Copyright (C) 2004 Patrick T. Wallace |
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* Copyright (C) 2012 Science and Technology Facilities Council. |
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* All Rights Reserved. |
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* Licence: |
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* This program is free software: you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation, either |
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* version 3 of the License, or (at your option) any later |
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* version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General |
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* License along with this program. If not, see |
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65
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* . |
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66
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67
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* Bugs: |
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68
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* {note_any_bugs_here} |
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*- |
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*/ |
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71
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72
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#include "pal.h" |
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73
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#include "pal1sofa.h" |
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74
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75
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0
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void palGeoc ( double p, double h, double *r, double *z ) { |
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76
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double xyz[3]; |
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77
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const double elong = 0.0; /* Use zero longitude */ |
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78
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const double AU = 1.49597870E11; |
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79
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/* WGS84 looks to be the closest match */ |
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80
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0
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eraGd2gc( ERFA_WGS84, elong, p, h, xyz ); |
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81
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0
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*r = xyz[0] / (AU * cos(elong) ); |
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82
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0
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*z = xyz[2] / AU; |
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0
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} |