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Functions
int	crossp_ (float v1, float v2, float *v3)

void	sunangs_ (int year, int day, float gmt, float lon, float lat, float sunz, float *suna)

void	get_zenaz (float pos, float lon, float lat, float zenith, float *azimuth)

void	compute_alpha (float lon[], float lat[], float senz[], float sena[], double mnorm[3], int npix, float alpha[])

void	l_sun_ (int iyr, int idoy, double sec, float sunr[3], float rs)

void	ocorient_ (float pos, float vel, float att, float()[3], float *coef)

double	esdist_ (int year, int day, int *msec)

void	cdata_ ()

void	nav_get_vel (float ilat, float mlat, float ilon, float mlon, float *vel)

void	nav_get_pos (float lat, float lon, float alt, float *p)

void	nav_gd_orient (float pos, float vel, float att, float smat[], float *coef)

void	nav_get_geonav (float sunr, float pos, float pview, float coef, float smat[], float xlon, float xlat, float solz, float sola, float senz, float *sena)

double	angular_distance (double lat1, double lon1, double lat2, double lon2)

double	deg2rad (double deg)

double	rad2deg (double rad)

Function Documentation

◆ angular_distance()

double angular_distance	(	double	lat1,
		double	lon1,
		double	lat2,
		double	lon2
	)

Definition at line 537 of file read_prism.c.

◆ cdata_()

void cdata_ ( )

◆ compute_alpha()

void compute_alpha	(	float	lon[],
		float	lat[],
		float	senz[],
		float	sena[],
		double	mnorm[3],
		int	npix,
		float	alpha[]
	)

Definition at line 8 of file compute_alpha.c.

◆ crossp_()

int crossp_	(	float *	v1,
		float *	v2,
		float *	v3
	)

computes cross product v3 = v1 x v2

Parameters

v1	first vector
v2	second vector
v3	result

Returns

Definition at line 13 of file crossp.c.

◆ deg2rad()

double deg2rad ( double deg )

Definition at line 550 of file read_prism.c.

◆ esdist_()

double esdist_	(	int *	iyr,
		int *	iday,
		int *	msec
	)

c This subroutine computes the earth-sun distance in AU. It uses the model c referenced in The Astronomical Almanac for 1984, Section S (Supplement).

c Subprograms referenced: c c JD Computes Julian day from calendar date c c Coded by: Frederick S. Patt, GSC, November 2, 1992 c Adapted from sun2000 to esdist by B. Franz, Oct 2003.

Parameters

year
day
msec

Returns

c Compute floating point days since Jan 1.5, 2000 c Note that the Julian day starts at noon on the specified date

Definition at line 21 of file esdist.c.

◆ get_zenaz()

void get_zenaz	(	float *	pos,
		float	lon,
		float	lat,
		float *	zenith,
		float *	azimuth
	)

Definition at line 28 of file get_zenaz.c.

◆ l_sun_()

void l_sun_	(	int *	iyr,
		int *	iday,
		double *	sec,
		float	sunr[3],
		float *	rs
	)

c Computes unit Sun vector in geocentric rotating coodinates, using c subprograms to compute inertial Sun vector and Greenwich hour angle c Subprograms referenced: c c SUN2000 Computes inertial Sun vector c GHA2000 Computes Greenwich sidereal angle c c Coded by: Frederick S. Patt, GSC, September 29, 1992 c c Modification History: c c Modifified to use new Sun and hour angle routines c Frederick S. Patt, November 3, 1992 c c Removed internal jd() function, since it is available as an c independent module. B. A. Franz, GSC, November 14, 1997.

Parameters

iyr	input Year, four digits (i.e, 1993)
idoy	input Day of year (1-366)
sec	input Seconds of day
sunr	output Unit Sun vector in geocentric rotating coordinates
rs	Earth-to-Sun distance (AU)

Definition at line 28 of file l_sun.c.

◆ nav_gd_orient()

void nav_gd_orient	(	float *	pos,
		float *	vel,
		float *	att,
		float *	smat[],
		float *	coef
	)

Definition at line 160 of file get_zenaz.c.

◆ nav_get_geonav()

void nav_get_geonav	(	float *	sunr,
		float *	pos,
		float *	pview,
		float *	coef,
		float *	smat[],
		float *	xlon,
		float *	xlat,
		float *	solz,
		float *	sola,
		float *	senz,
		float *	sena
	)

Definition at line 310 of file get_zenaz.c.

◆ nav_get_pos()

void nav_get_pos	(	float	lat,
		float	lon,
		float	alt,
		float *	p
	)

Definition at line 134 of file get_zenaz.c.

◆ nav_get_vel()

void nav_get_vel	(	float	ilat,
		float	mlat,
		float	ilon,
		float	mlon,
		float *	vel
	)

Definition at line 105 of file get_zenaz.c.

◆ ocorient_()

void ocorient_	(	float *	pos,
		float *	vel,
		float *	att,
		float(*)	[3],
		float *	coef
	)

◆ rad2deg()

double rad2deg ( double rad )

Definition at line 32 of file compute_dist.c.

◆ sunangs_()

void sunangs_	(	int *	iyr,
		int *	iday,
		float *	gmt,
		float *	xlon,
		float *	ylat,
		float *	sunz,
		float *	suna
	)

$brief c Given year, day of year, time in hours (GMT) and latitude and c longitude, returns an accurate solar zenith and azimuth angle. c Based on IAU 1976 Earth ellipsoid. Method for computing solar c vector and local vertical from Patt and Gregg, 1993, Int. J. c Remote Sensing.c c Subroutines required: sun2000 c gha2000 c jd c

Parameters

year
day
gmt
lon
lat
sunz
suna

Definition at line 25 of file sunangs.c.

Functions

Function Documentation

◆ angular_distance()

◆ cdata_()

◆ compute_alpha()

◆ crossp_()

◆ deg2rad()

◆ esdist_()

◆ get_zenaz()

◆ l_sun_()

◆ nav_gd_orient()

◆ nav_get_geonav()

◆ nav_get_pos()

◆ nav_get_vel()

◆ ocorient_()

◆ rad2deg()

◆ sunangs_()