|
xcc_v_convert
This routine rotates a 3D coordinate vector from one astronomical coordinate
system to another.
Location in HEALPix directory tree:
src/f90/mod/coord_v_convert.f90
FORMAT call xcc_v_convert(
ivector, iepoch, oepoch, isys, osys, ovector
)
ARGUMENTS
| name & dimensionality |
kind |
in/out |
description |
|---|
| |
|
|
|
|
ivector(1:3) |
DP |
IN |
3D coordinate vector of one astronomical object,
in the input coordinate system. |
| iepoch |
DP |
IN |
epoch of the input astronomical coordinate system. |
| oepoch |
DP |
IN |
epoch of the output astronomical coordinate system. |
| isys(len=*) |
CHR |
IN |
input coordinate system, should be one of 'E'=Ecliptic, 'G'=Galactic, 'C'/'Q'=Celestial/eQuatorial. |
| osys(len=*) |
CHR |
IN |
output coordinate system, same choice as above. |
| ovector(1:3) |
DP |
IN |
3D coordinate vector of the same object,
in the output coordinate system. |
EXAMPLE:
use healpix_types
use coord_v_convert, only: xcc_v_convert
real(dp) :: vecin(1:3), vecout(1:3)
vecin = (/ 0_dp, 0_dp, 1_dp /)
call xcc_v_convert(vecin, 2000.0_dp, 2000.0_dp, 'g', 'c', vecout)
Will produce in vecout the location in Celestial coordinates (2000 epoch) of
the North Galactic Pole (defined in vecin)
RELATED ROUTINESThis section lists the routines related to xcc_v_convert
-
coordsys2euler_zyz
- produces the
Euler angles
 in (Z,Y,Z) convention for rotation between standard astronomical coordinate systems.
-
ang2vec, vec2ang
- Routine to convert spherical coordinates
(co-latitude and longitude) into 3D vector coordinates and vice-versa.
Eric Hivon
2010-06-18
|
|
