Geodesy.cpp File Reference

Implements utility functions related to geodesic systems. More...

#include "../Include/FlyLegacy.h"
#include "../Include/Utility.h"
#include <plib/sg.h>

Go to the source code of this file.

Defines
#define	PI_2   (SGD_PI * 2)
#define	ARCSEC_360DEG   (360 * 3600)
#define	ARCSEC_TO_RAD   (PI_2 / ARCSEC_360DEG)
#define	ONE_ARCSEC   (ARCSEC_TO_RAD)
#define	EQUATORIAL_RADIUS_FEET   (3963.19 * 5280)
#define	EQUATORIAL_RADIUS_M   (EQUATORIAL_RADIUS_FEET * METRES_PER_FOOT)
#define	EQ_RAD_SQUARE_M   (EQUATORIAL_RADIUS_M * EQUATORIAL_RADIUS_M)
Functions
void	test_geodesy (void)
SPosition	GeocToGeod (SPosition pos)
SPosition	GeodToGeoc (SPosition pos)
SVector	GeocToCartesian (SPosition pos)
void	GeocToCartesianSgdVec3 (SPosition pos, sgdVec3 *v)
SPosition	CartesianToGeoc (SVector v)
SVector	GeodToCartesian (SPosition pos)
static double	M0 (double e2)
static int	geo_direct_wgs_84 (const double &alt, const double &lat1, const double &lon1, const double &az1, const double &s, double *lat2, double *lon2, double *az2)
SPosition	GreatCirclePosition (SPosition *from, SVector *polar)
static int	geo_inverse_wgs_84 (const double &alt, const double &lat1, const double &lon1, const double &lat2, const double &lon2, double *az1, double *az2, double *s)
SVector	GreatCirclePolar (SPosition *from, SPosition *to)
Variables
static const double	FP = 0.003352813178
static const double	E = 0.996647186
static const double	EPS = 0.081819221
static const double	INVG = 0.031080997

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Detailed Description

These routines transform geocentric coordinates to geodetic coordinates using the WGS84 coordinate system.

The code was taken from SimGear 0.3.3 module "sg_geodesy.cxx". Minor cosmetic changes made for Fly! Legacy project by Chris Wallace.

See end of file for original comments

Definition in file Geodesy.cpp.

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Define Documentation

#define ARCSEC_360DEG   (360 * 3600)

Definition at line 80 of file Geodesy.cpp.

#define ARCSEC_TO_RAD   (PI_2 / ARCSEC_360DEG)

Definition at line 81 of file Geodesy.cpp. Referenced by GeocToGeod(), and GeodToGeoc().

#define EQ_RAD_SQUARE_M   (EQUATORIAL_RADIUS_M * EQUATORIAL_RADIUS_M)

Definition at line 85 of file Geodesy.cpp. Referenced by GeocToGeod(), and GeodToGeoc().

#define EQUATORIAL_RADIUS_FEET   (3963.19 * 5280)

Definition at line 83 of file Geodesy.cpp.

#define EQUATORIAL_RADIUS_M   (EQUATORIAL_RADIUS_FEET * METRES_PER_FOOT)

Definition at line 84 of file Geodesy.cpp. Referenced by GeocToGeod().

#define ONE_ARCSEC   (ARCSEC_TO_RAD)

Definition at line 82 of file Geodesy.cpp. Referenced by GeocToGeod().

#define PI_2   (SGD_PI * 2)

Definition at line 79 of file Geodesy.cpp. Referenced by GeocToGeod().

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Function Documentation

SPosition CartesianToGeoc (  SVector  v  )

Definition at line 236 of file Geodesy.cpp. References SPosition::alt, SPosition::lat, SPosition::lon, PI, SVector::x, SVector::y, and SVector::z. Referenced by test_geodesy().

static int geo_direct_wgs_84 (  const double &  alt, const double &  lat1, const double &  lon1, const double &  az1, const double &  s, double *  lat2, double *  lon2, double *  az2 )  [static]

Definition at line 287 of file Geodesy.cpp. References first, and M0(). Referenced by GreatCirclePosition().

static int geo_inverse_wgs_84 (  const double &  alt, const double &  lat1, const double &  lon1, const double &  lat2, const double &  lon2, double *  az1, double *  az2, double *  s )  [static]

Definition at line 407 of file Geodesy.cpp. Referenced by GreatCirclePolar().

SVector GeocToCartesian (  SPosition  pos  )

Definition at line 209 of file Geodesy.cpp. References SPosition::alt, SPosition::lat, SPosition::lon, SVector::x, SVector::y, and SVector::z. Referenced by GeodToCartesian(), and test_geodesy().

void GeocToCartesianSgdVec3 (  SPosition  pos, sgdVec3 *  v )

Definition at line 223 of file Geodesy.cpp. References SPosition::alt, SPosition::lat, and SPosition::lon.

SPosition GeocToGeod (  SPosition  pos  )

Definition at line 104 of file Geodesy.cpp. References SPosition::alt, ARCSEC_TO_RAD, E, EPS, EQ_RAD_SQUARE_M, EQUATORIAL_RADIUS_M, FeetToMetres(), SPosition::lat, SPosition::lon, MetresToFeet(), ONE_ARCSEC, and PI_2. Referenced by test_geodesy().

SVector GeodToCartesian (  SPosition  pos  )

Definition at line 252 of file Geodesy.cpp. References GeocToCartesian(), and GeodToGeoc(). Referenced by CSkyManager::Update().

SPosition GeodToGeoc (  SPosition  pos  )

Definition at line 169 of file Geodesy.cpp. References SPosition::alt, ARCSEC_TO_RAD, E, EQ_RAD_SQUARE_M, FeetToMetres(), SPosition::lat, SPosition::lon, and MetresToFeet(). Referenced by GeodToCartesian(), and test_geodesy().

SVector GreatCirclePolar (  SPosition *  from, SPosition *  to )

Definition at line 524 of file Geodesy.cpp. References SPosition::alt, FeetToMetres(), geo_inverse_wgs_84(), SVector::h, SPosition::lat, SPosition::lon, MetresToFeet(), SVector::p, and SVector::r. Referenced by CNavRadio::TimeSlice(), and CBKKX155Radio::TimeSlice().

SPosition GreatCirclePosition (  SPosition *  from, SVector *  polar )

Definition at line 376 of file Geodesy.cpp. References SPosition::alt, FeetToMetres(), geo_direct_wgs_84(), SVector::h, SPosition::lat, SPosition::lon, and SVector::r.

static double M0 (  double  e2  )  [inline, static]

Definition at line 282 of file Geodesy.cpp. Referenced by geo_direct_wgs_84().

void test_geodesy (  void   )

Definition at line 44 of file Geodesy.cpp. References SPosition::alt, CartesianToGeoc(), FormatPosition(), GeocToCartesian(), GeocToGeod(), GeodToGeoc(), SPosition::lat, and SPosition::lon.

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Variable Documentation

const double E = 0.996647186 [static]

Definition at line 95 of file Geodesy.cpp. Referenced by CTerrainManager::Draw(), GeocToGeod(), GeodToGeoc(), CMoonImage::Reposition(), and CSkyManager::SetCamera().

const double EPS = 0.081819221 [static]

Definition at line 96 of file Geodesy.cpp. Referenced by GeocToGeod().

const double FP = 0.003352813178 [static]

Definition at line 94 of file Geodesy.cpp.

const double INVG = 0.031080997 [static]

Definition at line 97 of file Geodesy.cpp.

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