93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/*
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*
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* NMEA library
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* URL: http://nmea.sourceforge.net
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* Author: Tim (xtimor@gmail.com)
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* Licence: http://www.gnu.org/licenses/lgpl.html
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* $Id: gmath.h 17 2008-03-11 11:56:11Z xtimor $
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*
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*/
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#ifndef __NMEA_GMATH_H__
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#define __NMEA_GMATH_H__
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#include "info.h"
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#define NMEA_PI (3.141592653589793) /**< PI value */
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#define NMEA_PI180 (NMEA_PI / 180) /**< PI division by 180 */
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#define NMEA_EARTHRADIUS_KM (6378) /**< Earth's mean radius in km */
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#define NMEA_EARTHRADIUS_M (NMEA_EARTHRADIUS_KM * 1000) /**< Earth's mean radius in m */
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#define NMEA_EARTH_SEMIMAJORAXIS_M (6378137.0) /**< Earth's semi-major axis in m according WGS84 */
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#define NMEA_EARTH_SEMIMAJORAXIS_KM (NMEA_EARTHMAJORAXIS_KM / 1000) /**< Earth's semi-major axis in km according WGS 84 */
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#define NMEA_EARTH_FLATTENING (1 / 298.257223563) /**< Earth's flattening according WGS 84 */
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#define NMEA_DOP_FACTOR (5) /**< Factor for translating DOP to meters */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* degree VS radian
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*/
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double nmea_degree2radian(double val);
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double nmea_radian2degree(double val);
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/*
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* NDEG (NMEA degree)
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*/
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double nmea_ndeg2degree(double val);
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double nmea_degree2ndeg(double val);
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double nmea_ndeg2radian(double val);
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double nmea_radian2ndeg(double val);
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/*
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* DOP
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*/
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double nmea_calc_pdop(double hdop, double vdop);
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double nmea_dop2meters(double dop);
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double nmea_meters2dop(double meters);
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/*
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* positions work
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*/
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void nmea_info2pos(const nmeaINFO *info, nmeaPOS *pos);
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void nmea_pos2info(const nmeaPOS *pos, nmeaINFO *info);
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double nmea_distance(
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const nmeaPOS *from_pos,
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const nmeaPOS *to_pos
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);
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double nmea_distance_ellipsoid(
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const nmeaPOS *from_pos,
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const nmeaPOS *to_pos,
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double *from_azimuth,
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double *to_azimuth
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);
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int nmea_move_horz(
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const nmeaPOS *start_pos,
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nmeaPOS *end_pos,
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double azimuth,
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double distance
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);
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int nmea_move_horz_ellipsoid(
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const nmeaPOS *start_pos,
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nmeaPOS *end_pos,
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double azimuth,
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double distance,
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double *end_azimuth
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);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __NMEA_GMATH_H__ */
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