Royal Belgian Institute for Aeronomy¶

coord_trans_vec1 - Transforms coordinates between systems¶

subroutine coord_trans_vec1(ntime, sysaxesin, sysaxesout, year, doy, ut, xin, xout)¶

Parameters:

ntime [integer4,in] :: number of locations to transform
sysaxesin [integer4,in] :: starting coordinate system index [0-11]
sysaxesout [integer4,in] :: final coordinate system index [0-11]
year (ntime_max) [integer4,in] :: year of coordinate points
doy (ntime_max) [integer4,in] :: day of year of coordinate points [1-366]
ut (ntime_max) [real8,in] :: universal time in seconds
xinv (3, ntime_max) [real8,in] :: positions to transform
xout (3, ntime_max) [real8,out] :: positions in sysaxesout coordinates.

Description¶

The coordinates specified by year, doy, ut, and xin are transformed from the sysaxesin coordinate system to the sysaxesout coordinate system and returned in the xout argument.

SYSAXES indices¶

sysaxes	acronym	type	description	units	implemented
0	GDZ	Geodetic	altitude, latitude, East longitude	km, °, °	Y
1	GEO	cartesian	Geographic	Earth radii	Y
2	GSM	cartesian	Geocentric Solar Magnetic	Earth radii	Y
3	GSE	cartesian	Geocentric Solar Ecliptic	Earth radii	Y
4	SM	cartesian	Solar Magnetic	Earth radii	Y
5	GEI	cartesian	Geocentric Equatorial Inertial	Earth radii	Y
6	MAG	cartesian	Geomagnetic	Earth radii	Y
7	SPH	spherical	GEO in spherical radial distance, latitude, East longitude	Earth radii, °,°	Y
8	RLL	spherical	GEI in spherical radial distance, latitude, East longitude	Earth radii, °,°	Y
9	HEE	cartesian	Heliocentric Earth Ecliptic, aka HSE	AU	N
10	HAE	cartesian	Heliocentric Aries Ecliptic, aka HSA	AU	N
11	HEEQ	cartesian	Heliocentric Earth Equatorial, aka HS	AU	N
12	TOD	cartesian	True of Date, same as GEI using true equator of date and equinox of date	Earth radii	N
13	J2000	cartesian	GEI, but with epoch of equinox and equator set to 01/01/2000 00:00UT	Earth radii	N
14	TEME	cartesian	True Equator Mean Equinox	Earth radii	N

see IRBEM Common Arguments section on SYSAXES

see also Coordinate Systems

Note

The Earth radius used within the IRBEM library is 6371.2 km.

IRBEM subroutine documentation

IRBEM Common argument definitions

UNILIB/tags/v3.02