name & dim. |
kind |
in/out |
description |
|
|
|
|
nmaps (OPTIONAL) |
I4B |
OUT |
number of maps in the extension. |
ordering (OPTIONAL) |
I4B |
OUT |
pixel ordering, 0=unknown, 1=RING, 2=NESTED |
obs_npix (OPTIONAL) |
I4B |
OUT |
number of non blanck pixels. It is set to -1 if it can not be determined from header
information alone |
nside (OPTIONAL) |
I4B |
OUT |
Healpix resolution parameter Nside. Returns a negative value if not found. |
mlpol (OPTIONAL) |
I4B |
OUT |
maximum multipole used to generate the map
(for simulated map). Returns a negative value if not found. |
type (OPTIONAL) |
I4B |
OUT |
Healpix/FITS file type
0 : file not found, or not valid
0 : image only fits file, deprecated Healpix format
(var = 12 * nside * nside)
1 : ascii table, generally used for C(l) storage
2 : binary table : with implicit pixel indexing (full sky)
(var = 12 * nside * nside)
3 : binary table : with explicit pixel indexing (generally cut sky)
(var 12 * nside * nside)
999 : unable to determine the type |
polarisation (OPTIONAL) |
I4B |
OUT |
presence of polarisation data in the file
0 : can not find out
0 : no polarisation
1 : contains polarisation (Q,U or G,C) |
fwhm_arcmin (OPTIONAL) |
DP |
OUT |
returns the beam FWHM read from FITS header,
translated from Deg (hopefully) to arcmin.
Returns a negative value if not found. |
beam_leg(LEN=*) (OPTIONAL) |
CHR |
OUT |
filename of beam or
filtering window function applied to data
(FITS keyword BEAM_LEG). Returns a empty string if not found. |
coordsys(LEN=20) (OPTIONAL) |
CHR |
OUT |
string describing the pixelation
astrophysical coordinates.
'G' = Galactic, 'E' = ecliptic, 'C' = celestial = equatorial.
Returns a empty string if not found. |
polcconv (OPTIONAL) |
I4B |
OUT |
polarisation coordinate convention
(see Healpix primer for details) 0=unknown, 1=COSMO, 2=IAU, 3=neither COSMO nor IAU |
extno (OPTIONAL) |
I4B |
IN |
extension number (0 based) for which information
is provided. Default = 0 (first extension). |
npix= getsize_fits('map.fits', nmaps=nmaps, ordering=ordering, obs_npix=obs_npix, nside=nside, mlpol=mlpol, type=type, polarisation=polarisation)