AIPS HELP file for SMOTH in 31DEC24
As of Sat Apr 20 7:38:53 2024
SMOTH: Task to smooth a subimage from upto a 7-dim. image
INPUTS
INNAME Input name(name).
INCLASS Input name(class).
INSEQ 0.0 9999.0 Input name(seq. #). 0=>high
INDISK 0.0 9.0 Input disk drive #. 0=>any
OUTNAME Output name(name).
OUTCLASS Output name(class).
OUTSEQ -1.0 9999.0 Output name(seq. #).
0 => highest unique
OUTDISK 0.0 9.0 Output image disk drive #
BLC 0.0 2048.0 Bottom left corner of image
0=>entire image
TRC 0.0 2048.0 Top right corner of image
0=>entire image
XINC 1.0 10.0 Select every XINC col. 0=>1
YINC 1.0 10.0 Select every YINC rows. 0=>1
BMAJ 0.0 9999.0 Beam major axis FWHP of
input map in arcsec. 0=>use
catalog header value
BMIN 0.0 9999.0 Same, minor axis FWHP
BPA -180.0 180.0 Same, position angle in degr.
SCALR1 0.0 9999.0 Beam major axis FWHP of
output map in arcsec.
SCALR2 0.0 9999.0 Same, minor axis FWHP
SCALR3 -180.0 180.0 Same, position angle in degr.
HELP SECTION
SMOTH
Type: Task
Use: SMOTH will smooth (a subimage from) up to a 7-dim. image in the
map plane in the first two coordinates. These axes have to be
LL/MM or RA/Dec. The bottom left pixel in the output map (1,1)
will coincide in position with the point (BLC(1),BLC(2)) in the
input map; the point (2,2) with (BLC(1)+XINC,BLC(2)+YINC); and
so on. SCALR1-3 define the beam in the output map, NOT the
convolving kernel. If BMAJ=0.0 the CLEAN beam parameters from
the catalogue header are used for the input map. The size of
the kernel is tailored to the convolving function up to 25x25;
if that size is not adequate, an error condition (100) occurs;
ibid. if the kernel size is reduced to 1 in either coord (-100).
Other non-standard error codes:
11 : First two input map coordinates not RA-DEC or LL-MM.
12 : Output beam smaller than input beam.
13 : XINC and/or YINC > convolving kernel.
14 : Map smaller than convolving kernel.
At any point (along the edges) where the kernel extends beyond
the input map, the output intensity is set to indefinite. If
the position angle of the convolving function is either 0 or 90
degrees, the convolutions in X and Y direction are separated,
resulting in much (>5) faster execution.
Notes:
1) The image is rescaled to reflect correct Jy/beam for the
new beam. The noise in these units may actually be higher
than in the input image. It will be lower in Jy/pixel. The
S/N goes up in any units.
2) CONVL may be the better or faster convolution task. But
SMOTH now (August 2003) handles blanks in a desirable way,
while CONVL cannot handle blanked pixels.
Adverbs:
INNAME.....Input name (name); Standard defaults.
INCLASS....Input name (class); Standard defaults.
INSEQ......Input name (sequence number); 0: highest.
INDISK.....Input disk unit number; 0: any.
OUTNAME....Output name (name); Standard defaults.
OUTCLASS...Output name (class); Standard defaults.
OUTSEQ.....Output name (sequence number); 0: highest unique.
OUTDISK....Output disk unit number; 0: highest with room.
BLC........Bottom left corner of subimage; 0: entire image
TRC........Top right corner of subimage; 0: entire image
XINC.......Select every XINCth column; 0: 1
YINC.......Select every YINCth row; 0: 1
BMAJ.......Beam major axis FWHM of input map in arcsec; 0: use
catalog header value
BMIN.......Same, minor axis FWHM
BPA........Same, position angle in degrees
SCALR1.....Beam major axis FWHM of output map in arcsec
SCALR2.....Same, minor axis FWHM
SCALR3.....Same, position angle in degrees
EXPLAIN SECTION