AIPS HELP file for RMSD in 31DEC09
As of Sat Nov 21 20:27:44 2009
RMSD: Creates the image of RMS at each velocity plane.
INPUTS
INNAME Input image name (name)
INCLASS Input image name (class)
INSEQ 0.0 9999.0 Input image name (seq. #)
INDISK 0.0 9.0 Input image disk unit #
OUTNAME Output image name (name)
OUTCLASS Output image name (class)
OUTSEQ -1.0 9999.0 Output image name (seq. #)
OUTDISK 0.0 9.0 Output image disk unit #.
BLC Bottom left corner of input
TRC Top right corner of input
IMSIZE Size of the box used to
calculate rms, in pixels
IMSIZE(2)=-1 => the circle
of diameter=IMSIZE(1)is used
OPCODE 'RMS ', 'MEAN', or 'BLAN'
(see help), ' ' => 'RMS '
OPTYPE 'ROBS', 'HIST'
(see help), ' ' => 'ROBS'
SCALR1 DataSCALR2 >0 =>
ABS(DATA) < SCALR2*RMS
are replaced by blank
(OPCODE='BLAN')
<0 =>
ABS(DATA) > ABS(SCALR2)*RMS
are replaced by blank
(OPCODE='BLAN')
0 => no blanking
SCALR3 Number of RMS used at each
iteration calculating final
RMS. 0 => 3
FLUX Data with RMS>FLUX
are replaced by blank
(OPCODE='BLAN')
0 => no blanking
XINC Increment at X to calculate
RMS, in pixels
YINC Increment at Y to calculate
RMS, in pixels
The intermediate points are
calculated by interpolation
HELP SECTION
RMSD
Task: Creates the image of RMS at each velocity(frequency) plane.
The rms is calculated for each pixel based on the data at
the box surrounding the pixel. The size of the box is
controlled by the user (adverb IMSIZE).
RMS is calculated on the multi iteration (30) basis.
At the first iteration the RMS is calculated using all points
of the box. The points which differ of the mean more than
SCALR3*RMS are excluded from the consideration for the next
iteration.
The iteration process is terminated if none point is excluded.
Adverbs:
The input image should have the standard sequence of axes
the first is X
the second is Y
the third is velocity/frequency
INNAME.....Input image name (name). Standard defaults.
INCLASS....Input image name (class). Standard defaults.
INSEQ......Input image name (seq. #). 0 => highest.
INDISK.....Disk drive # of input image. 0 => any.
OUTNAME....Output image name (name). Standard defaults.
OUTCLASS...Output image name (class) Standard defaults.
OUTSEQ.....Output image name (seq. #). 0 => highest unique.
OUTDISK....Disk drive # of output image. 0 => highest
BLC........Bottom left corner in input image of desired
subimage. Default is entire image.
TRC........Top right corner in input image of desired
subimage. Default is entire image.
IMSIZE.....Size of the box used to calculate rms, in pixels
IMSIZE(2)=-1 =>
the circle of diameter=IMSIZE(1)is used, instead of
the box IMSIZE(1)xIMSIZE(2)
OPCODE.....'RMS ' =>
creates map of RMSes calculated for each pixel
using the data inside of the given box surrounded
the pixel.
'MEAN' =>
creates map of MEANes calculated for each pixel
using the data inside of the given box surrounded
the pixel.
'BLAN' =>
the image value is replaced by BLANK under control
of adverbs SCALR1 and SCALR2 and calculated RMS.
This option prepares the image cube to be ready for
other tasks (XMOM for example) that require
cutoff the 'bad' points on the basis of rms calculated
at the vicinity of each image point.
' ' => 'RMS '
OPTYPE.....Concept of RMS' calculation
'ROBS' => The far away points are rejected at the multi
iteration process
'HIST' => The histogram concept is used. Data for histogram
are at the range -+ 1.5sigma. The histogram is
calculated at 16 intervals with center at the
mean value
SCALR1.....Number of the rms used at the cutoff.
Data values below SCALR1*RMS are replaced by BLANK.
(OPCODE='BLAN')
SCALR2.....Number of the rms used at the cutoff.
When SCALR2 > 0.0,
data values less in absolute value
than RMS*SCALR2 are replaced by blank.
When SCALR2 < 0.0,
data values greater in absolute value
than ABS(SCALR2) are replaced by blank.
When SCALR2=0,
no replacement by blank
SCALR3.....Number of RMS used at each iteration calculating
final RMS. 0 => 3
FLUX.......Data with RMS>FLUX are replaced by blank (OPCODE='BLAN')
FLUX is in Jy/beam
0 => no replacement by blank
Replacement by blank is carried out (OPCODE='BLAN')
if 'SCALR1' .OR. 'SCALR2' .OR. 'FLUX'
XINC.......Increment at X to calculate RMS, in pixels
YINC.......Increment at Y to calculate RMS, in pixels
The task RMS requires a lot of computing time. XINC, YINC are invented
to weaken the computing time problem. The RMS is calculated every
XINC, YINC at the X,Y directions. The RMS of intermediate points are
estimated by interpolation. The computing time should be reduced
by the factor XINC*YINC
Programmer Leonia Kogan
EXPLAIN SECTION