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