importfits – Convert an image FITS file into a CASA image – import/export task

Description

Convert an image FITS file into a CASA image

Parameters

Title
Parameter	Default	Description
fitsimage	`''`	Name of input image FITS file
imagename	`''`	Name of output CASA image
whichrep	`int(0)`	If fits image has multiple coordinate reps, choose one.
whichhdu	`int(-1)`	If fits file contains multiple images, choose one (0 = first HDU, -1 = first valid image).
zeroblanks	`True`	Set blanked pixels to zero (not NaN)
overwrite	`False`	Overwrite output file if it exists?
defaultaxes	`False`	Add the default 4D coordinate axes where they are missing; value True requires setting defaultaxesvalues
defaultaxesvalues	`[ ]`	List of values to assign to added degenerate axes when defaultaxes==True (ra,dec,freq,stokes)
beam	`[ ]`	List of values to be used to define the synthesized beam [BMAJ,BMIN,BPA] (as in the FITS keywords)

Parameter Explanations

fitsimage

''

Name of input image FITS file: Default: none

Example: fitsimage=’3C273XC1.fits’

imagename

''

Name of output CASA image: Default: none

Example: fitsimage=’3C273XC1.image’

whichrep

int(0)

If fits image has multiple coordinate reps, choose one.: Default: 0 (means first)

Example: whichrep=1

whichhdu

int(-1)

If fits file contains multiple images, choose one

Default: -1 (use the first valid one)

NOTE: 0 = first HDU, -1 = first valid image

Example: whichhdu=1

zeroblanks

True

Set blanked pixels to zero (not NaN): Default: True Options: True|False

overwrite

False

Overwrite output file if it exists?: Default: False Options: False|True

defaultaxes

False

Add the default 4D coordinate axes where they are missing

Default: False Options: False|True

IMPORTANT: value True requires setting defaultaxesvalues

defaultaxesvalues

[ ]

List of values to assign to added degenerate axes when defaultaxes==True (ra,dec,freq,stokes)

Default: []

For existing axes, empty strings can be given as values. For the directions and spectral values, any valid angle/frequency expressions can be given.

Example: defaultaxesvalues=[‘19h30m00’, ‘-02d30m00’, ‘88.5GHz’, ‘Q’]

beam

[ ]

List of values to be used to define the synthesized beam [BMAJ,BMIN,BPA] (as in the FITS keywords)

Default: [] (i.e.take from FITS file)

Example: beam=[‘0.35arcsec’, ‘0.24arcsec’, ‘25deg’]