66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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*
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* geo-dist
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*
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* Copyright (C) 2006 Nils Faerber <nils.faerber@kernelconcepts.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef _GEO_DIST_H
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#define _GEO_DIST_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/*
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* Calculate distances on Earth surface given geographic locations
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*/
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typedef enum {
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WGS84,
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NAD27,
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International,
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Krasovsky,
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Bessel,
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WGS72,
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WGS66,
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FAIsphere
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} EllipsoidType;
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/* nautical in kilometer */
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#define NAUTICAL_MILE 1.852
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/*
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* glat1, glat2: geodetic latitude in radians, N positive
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* glon1, glon2: geodetic longitude in radians E positive
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* Coordinates in radians means
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* 50°50.32N ^= 50 degree, 50 minutes and 32 seconds
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* ^= 50 + (50 / 60) + (32 / 3600)
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* ^= 50.84222
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*
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* returns: distance in nm (nautical miles), factor of 1.852 gives km
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*/
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double dist_ell(double, double, double, double, EllipsoidType);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _GEO_DIST_H */
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