SCUMAKEWT - Create weights array for dual beam deconvolution

Description:

Construct an NDF holding the weights array for a particular chop throw and the Fourier Transform (FT) of the chop function (a sine wave).

Usage:

scumakewt chop pa pixsize size ftchop wtchop

Parameters:

CHOP = REAL (Read)

Chop throw in arcseconds. There is no default

FTCHOP = NDF (Write)

Output NDF containing fourier transform of the chop function. The size of the output array matches the dimensions supplied by parameter SIZE

LIKE = NDF (Read)

This parameter may be used to supply an NDF which is to be used as a template. If such a template is supplied, then its origin (its lower pixel-index bounds) and extent will be read used for the output NDFs. By default no template will be used and the size information will be read from the SIZE parameter. Additionally, the PA, PIXSIZE and CHOP parameters are searched for in the FITS extension if one is present (using keywords of CHOP_PA, SCUPIXSZ and CHOP_THR respectively). These parameters values are requested if not found in the FITS extension.

MSG_FILTER = CHAR (Read)

Message filter level. Default is NORM.

OUTCHOP = REAL (Write)

Chop throw angle actually used.

OUTPA = REAL (Write)

Position angle actually used.

OUTPIXSZ = REAL (Write)

Actual pixel size used (arcsec)

PA = REAL (Read)

Position angle of chop throw. Positive is anti-clockwise starting from North. The angle should be specified in degrees.

PIXSIZE = REAL (Read)

Pixel size to be used for output images. Should be in arcseconds (ie same units as used for the CHOP parameter)

SIZE( 2 ) = INTEGER (Read)

Array parameter containing the number of pixels (X, Y) in the output images.

WTCHOP = NDF (Write)

Output NDF containing the weights contributed by this chop configuration. This is FTCHOP squared. The size of the output array matches the dimensions supplied by parameter SIZE

Examples:

scumakewt 20 90 3 '[256,256]' ft wt

Generate the FT and weight of a 20 arcsec RA chop using 3 arcsec pixels and a 256 square output image. The weight is written to wt.sdf and the FT to ft.sdf.

scumakewt chop=20 size=[256,512] ftchop=fft wtchop=weights

Generate the weight and ft of a chop of size 20 arcseconds on a 256 x 512 image. The pixel scale will be requested.

Related Applications

SURF: remdbm