AIPS HELP file for UVHOL in 31DEC24
As of Wed Apr 24 4:34:18 2024
UVHOL: Prints/writes holography data with calibration
INPUTS
INNAME Input UV file name (name)
INCLASS Input UV file name (class)
INSEQ 0.0 9999.0 Input UV file name (seq. #)
INDISK Input UV file disk unit #
SOURCES Sources to print, ' '=>all.
QUAL -10.0 Qualifier -1=>all
CALCODE Calibrator code ' '=>all
STOKES 'FULL' in HOLG for 4 output
files, 'IQUV', 'IV' also
SELBAND Bandwidth to select (kHz)
SELFREQ Frequency to select (MHz)
FREQID Freq. ID to select.
TIMERANG Time range to select
ANTENNAS Reference antennas
BASELINE Moving antennas
SUBARRAY 0.0 1000.0 Subarray, 0 => 1
ICHANSEL 0.0 4096.0 Spectral channels to average
BIF IF number to print
DOCALIB -1.0 101.0 > 0 calibrate data & weights
> 99 do NOT calibrate weights
GAINUSE CAL (CL or SN) table to apply
DOPOL -1.0 10.0 If >0 correct polarization.
PDVER PD table to apply (DOPOL>0)
BLVER BL table to apply.
FLAGVER Flag table version
DOBAND -1.0 10.0 If >0 apply bandpass cal.
Method used depends on value
of DOBAND (see HELP file).
BPVER Bandpass table version
SMOOTH Smoothing function. See
HELP SMOOTH for details.
NCOUNT 0.0 30000.0 # of sample. 0 => 1 page.
WTUV 0.0 1000.0 Scale UV (actually LM) by
WTUV, 0 => 1 in HOLG, else
0 => 1000
OPTYPE Choice of format type:
'HOLG' write holography file
'PLOT' plot holography data
new
else print holography data
NPOINTS 0.0 1000.0 Number of samples to keep
at the end of each pointing
Used if APARM(1) = 0
0 => 100
OTFMODE > 0 => data taken in OTF not
stepping mode
APARM (1) 0 => NPOINTS used
1 => APARM(2,3) used
(2) number of samples dropped
at the beginning of
each pointing
(3) number of samples dropped
at the end of
each pointing
(4) > 0 write elevation and
azimuth at beg/end of scan
(5) > 0 => average data over
reference antennas
(6) > 0 => average each
pointing over time
(7) > 0 => display real/imag
in 'HOLG' and 'PLOT'
(8) > 0 => average data over
moving antennas
(9) > 0 => scalar amplitudes
in time & antenna average
(10) > 0 -> apply parallactic
angle correction on DOPOL
BDROP 0.0 1000.0 Minimum number of samples to
keep the pointing at all
DPARM 1 : <0 => Range of (U,V,W),
amplitude and weight is
determined automatically;
>= 0 => Ranges are fixed
minimize the run time.
2 : Maximum weight; 0 => 99.0
3 : Minimum weight; 0 => 0.11
4 : Maximum amplitude; 0=>9.9
5 : Maximum of ABS(U),ABS(V),
ABS(W) in klambda;
0 => 10000
6 : > 0 -> PLOT data as power
in db (20*log10)
> 1.5 if 2 moving ants
in db (10*log10)
7 : > 0 plot phase or imag
8 : > 0 solve sidelobes
10 : > 0 scale by flux in SU
DOCRT -3.0 132.0 > 0 -> use the terminal,
else use the line printer
> 72 => terminal width
OUTPRINT
Printer disk file to save
HOLG: area to write outputs
PIXRANGE (2) > (1) -> fix plot scale
FACTOR -1000.0 1000.0 Scale dots by FACTOR
< 0 => connect dots too
SYMBOL 0.0 24.0 Plot symbol number: 1 - 24
DO3COLOR -1.0 1.0 > 0 use color to separate
polarizations
LTYPE -410.0 410.0 Type of labeling: 1 border,
2 no ticks, 3 - 6 standard,
7 - 10 only tick labels
<0 -> no date/time
DOTV -10.0 10.0 > 0 Do plot on the TV, else
make a plot file
GRCHAN 0.0 8.0 Graphics channel 0 => 1.
XYRATIO 0.0 X/Y ratio 0 -> fit TV or 1 PL
BADDISK Disk to avoid for scratch.
HELP SECTION
UVHOL
Type: Task
Use: Prints holography data from a u,v data base, optionally making
retained text files. UVHOL is similar to UVPRT, but does only
the special holography modes which used to be a part of UVPRT.
These include printing for display purposes and the ability to
write files for input to HOLOG (which replaced HOLGR). It also
has the option to plot holography data rather than print.
Adverbs:
INNAME.....Input UV file name (name) Standard defaults.
INCLASS....Input UV file name (class) Standard defaults.
INSEQ......Input UV file name (seq. #) 0 => highest.
INDISK.....Disk drive # of input UV file. 0 => any.
SOURCES....List of sources to be printed. ' '=> all; if any
starts with a '-' then all except ANY source named.
QUAL.......Qualifier of source to be printed. -1 => all.
CALCODE....Calibrator code of sources to print. ' '=> all.
STOKES.....The usual Stokes parameter. In HOLG mode, FULL means to
write all 4 polarizations to disk files, IQUV means to
write all 4 Stokes polarizations, IV means to write the
two parallel hand Stokes, otherwise RR and LL only are
written. When simply printing, STOKES beginning with I
means 'IQUV', otherwise FULL is used. When plotting
STOKES values of 'HALF', 'IV', and 'IQUV' are used.
If fewer than 4 Stokes are available, the task takes
appropriate action in the STOKES adverb.
SELBAND....Bandwidth of data to be selected. If more than one IF is
present SELBAND is the width of the first IF required.
Units = kHz. For data which contain multiple
bandwidths/frequencies the task will insist that some form
of selection be made by frequency or bandwidth.
SELFREQ....Frequency of data to be selected. If more than one IF is
present SELFREQ is the frequency of the first IF required.
Units = MHz.
FREQID.....Frequency identifier to select (you may determine which is
applicable from the OPTYPE='SCAN' listing produced by
LISTR). If either SELBAND or SELFREQ are set, their values
overide that of FREQID. However, setting SELBAND and
SELFREQ may result in an ambiguity. In that case, the task
will request that you use FREQID. If all SELBAND, SELFREQ
and FREQID are not specified (.le. 0) then all FQ ids will
be selected.
TIMERANG...Time range of the data to be printed. In order: Start day,
hour, min. sec, end day, hour, min. sec. Days relative to
reference date.
ANTENNAS...A list of the reference antennas to print. At least one
must be given. The first is used to name the output file
in HOLG mode.
BASELINE...A list of the moving antennas. At least one must be
given.
SUBARRAY...Subarray number to print. 0 => 1.
ICHANSEL.. Array of start, stop, and increment channel numbers plus
an IF used for channel selection in the averaging to
compute data displayed. Up to 20 sets of channels/IF may
be entered. The first having ICHANSEL(2,i) <= 0
terminates the list. ICHANSEL(4,i) is the IF number,
with <= 0 meaning all IFs. If an IF has no ICHANSEL set
for it, then the inner 75 percent of that IF is used. Note
that only the values for IF # = BIF are actually used.
BIF........IF number to print. 0 => 1
DOCALIB....If true (>0), calibrate the data using information in the
specified Cal (CL) table for multi-source or SN table for
single-source data. Also calibrate the weights unless
DOCALIB > 99 (use this for old non-physical weights).
GAINUSE....Version number of the Cal. table to apply to the data if
DOCALIB=1. Refers to a CL table for multi-source data or
an SN table for single source. 0 => highest.
DOPOL......If > 0 then correct data for instrumental polarization as
represented in the AN or PD table. This correction is
only useful if PCAL has been run or feed polarization
parameters have been otherwise obtained. See HELP DOPOL
for available correction modes: 1 is normal, 2 and 3 are
for VLBI. 1-3 use a PD table if available; 6, 7, 8 are
the same but use the AN (continuum solution) even if a PD
table is present.
PDVER......PD table to apply if PCAL was run with SPECTRAL true and
0 < DOPOL < 6. <= 0 => highest.
BLVER......Version number of the baseline based calibration (BL) table
to apply. <0 => apply no BL table, 0 => highest.
FLAGVER....Specifies the version of the flagging table to be applied.
0 => highest numbered table. <0 => no flagging to be
applied.
DOBAND.....(multisource) If true (>0) then correct the data for the
shape of the antenna bandpasses using the BP table
specified by BPVER. The correction has five modes:
(a) if DOBAND=1 all entries for an antenna in the table
are averaged together before correcting the data.
(b) if DOBAND=2 the entry nearest in time (including
solution weights) is used to correct the data.
(c) if DOBAND=3 the table entries are interpolated in
time (using solution weights) and the data are then
corrected.
(d) if DOBAND=4 the entry nearest in time (ignoring
solution weights) is used to correct the data.
(e) if DOBAND=5 the table entries are interpolated in
time (ignoring solution weights) and the data are then
corrected.
BPVER......(multi-source) specifies the version of the BP table to be
applied. 0 => highest numbered table.
SMOOTH.....Specifies the type of spectral smoothing to be applied to
a uv database . The default is not to apply any smoothing.
The elements of SMOOTH are as follows:
SMOOTH(1) = type of smoothing to apply: 0 => no smoothing
To smooth before applying bandpass calibration
1 => Hanning, 2 => Gaussian, 3 => Boxcar, 4 => Sinc
To smooth after applying bandpass calibration
5 => Hanning, 6 => Gaussian, 7 => Boxcar, 8 => Sinc
SMOOTH(2) = the "diameter" of the function, i.e. width
between first nulls of Hanning triangle and sinc
function, FWHM of Gaussian, width of Boxcar. Defaults
(if < 0.1) are 4, 2, 2 and 3 channels for SMOOTH(1) =
1 - 4 and 5 - 8, resp.
SMOOTH(3) = the diameter over which the convolving
function has value - in channels. Defaults: 1,3,1,4
times SMOOTH(2) used when input SMOOTH(3) < net
SMOOTH(2).
NCOUNT.....List NCOUNT data points (after all data selection has been
applied). 0 => 1 page listed.
UVHOL will list up to 30000 visibilities. This limit does
not apply to HOLG.
Be aware that UVHOL now goes through the data to be printed
twice, once to determine the u-v-w, data, and weight ranges
and the second time to print things. Using NCOUNT to
reduce the time required by the first pass helps when DOCRT
is true.
WTUV.......Scale the "U" and "V" (actually sin^(-1)(theta) - the
offset angle) values. For HOLO, 0 => 1000.
For HOLG, < 0.1 and > 10.0 are changed to 1.0.
********************************************************
NOTE: this scaling may be required for HOLG to undo
scaling done when selecting an IF in AIPS tasks such as
UVCOP. All such tasks must scale u,v,w by the ratio of
the old reference frequency to the new reference
frequency. This is correct for the calibration scans in
the holography data set, but not for the actual
holography scans. Use WTUV to undo this scaling.
********************************************************
OPTYPE.....OPeration code to change details of the format:
'HOLG' => write holography data from one or more antenna
pairs to 2 or 4 files per pair for use in HOLOG
(No normal printing is done.)
Each line has 6 numbers: u, v, real, imag,
uncertainty in real, and in imag
or u, v, amplitude, phase, uncerainty in amp
and in phase
uncertainties are those in the mean numbers
(i.e. divided by sqrt(N-1))
'PLOT' => make one or more plots of the holography data,
APARM(7), DPARM(6), DPARM(7) control what is
plotted while adverbs PIXRANGE through XYRATIO
convey normal plot controls.
otherwise => print only holography data from one or more
antenna pairs.
NPOINTS....Retain the last NPOINTS samples from each pointing. Note
that pointings are indicated by the W term in the U,V,W
triplet. For holography, W = 40000+X where X is a counter
referring to the pointing or dwell currently selected. The
first samples for each dwell are suspect since not all
antennas have settled down. This option allows you to
select only the last NPOINTS samples. 0 -> 100 (the upper
limit).
OTFMODE....> 0 => data are taken in OTF mode with the moving antennas
moving continuously. In that case, NPOINTS is set to 1 and
every sample is taken. In non-OTF mode (<= 0), the moving
antennas shift positions occasionally but then stop for a
number of samples before moving to the next position. Some
samples at the beginning and end of each position are
retained for output (print, plot, input to HOLGR).
APARM......(1) 0 => option determined by NPOINTS is used
1 => option determined by APARM(2,3) is used
(2) number of samples dropped at the beginning of
each pointing
(3) number of samples dropped at the end of
each pointing
(4) >0 write elevation and azimuth at begining and
end of scans (only for OPTYPE = 'HOLG')
(5) > 0 => average each baseline between a moving antenna
reference antenna over all reference antennas
(6) > 0 => average all retained samples for each
pointing
(7) > 0 => display real and imaginary, otherwise
amplitude and phase (HOLG and PLOT only, amp and
phase printed on other OPTYPEs)
(8) > 0 => average each baseline with reference
antenna(s) of all moving antennas.
(9) > 0 => vector average data over spectral channels but
then display scalar average amplitudes when averaging
over time, reference antennas, and/or moving
antennas.
(10) For antenna-based display one does not want to apply
the parallactic angle correction when applying the
polarization D terms. To apply them, set APARM(10)>0
for displays in source coordinates.
BDROP......If a pointing has fewer than BDROP samples, then drop it
entirely. No default - 0 and 1 mean keep all. Note
that this is the total number of samples, not those after
application of APARM(2) and APARM(3) (or NPOINTS).
DPARM......Range of (U,V,W), amplitude and weight:
(1) : < 0 => Range of (U,V,W), amplitude and weight is
determined automatically; If the data are large, the
time for required additional pass of the data to provide
the scaling can be rather large. To eliminate this extra
pass use DPARM(1)=0.
>= 0 => The ranges are fixed to the following values:
(2) : Maximum weight; 0 => 99.0
(3) : Minimum weight; 0 => 0.11
(4) : Maximum amplitude; 0=>9.9
(5) : Maximum of ABS(U),ABS(V),ABS(W) in lambda times WTUV
(normally klambda); 0 => 10000
(6) : > 1.5 -> Plot 10 * LOG10 (amp) rather than amplitude
This is appropriate when both antennas are
moving
> 0 but <= 1.5 -> Plot 20 * LOG10 (amp) rather than
amplitude only applied to amplitude, not real,
imaginary, or phase, appropriate when only one
antenna is moving
(7) : > 0 -> Plot phase or imaginary, else amplitude or real
(8) > 0 => try to find opposite sidelobes and their ratio
in db computed based on DPARM(6) with 20*LOG10(amp)
when DPARM(6) < 1.5 and 10*LOG10(amp) otherwise.
DOCRT......False (<= 0) use the line printer if OUTPRINT = ' '
else write named OUTPRINT file only.
When OUTPRINT is not blank, DOCRT=-2 suppresses the
page-feed character on page headers and DOCRT=-3
suppresses page headers and most other header
information (non-HOLG mode). When OUTPRINT is
blank, the line printer will be used. UVHOL now
counts the lines to be printed before printing any
and asks for permission to continue if the count >
500.
True (> 0) use the terminal interactively. The task will
use the actual terminal width as a display limit
unless 72 < DOCRT < width. In that case, the display
limit will be DOCRT characters. 132 width is best.
OUTPRINT...Disk file name in which to save the line printer output.
' ' => use scratch and print immediately for interactive
jobs - batch jobs use OUTPRINT = 'PRTFIL:BATCHjjj.nnn'
(jjj= job #, nnn = user #). When OUTPRINT is not blank,
multiple outputs are concatenated, and the file is not
actually printed.
For HOLG mode only, OUTPRINT may give the name of a
logical area plus optional file name to which to write
the HOLOG data files (e.g. OUTPR = 'MYAREA' or OUTPR =
'MYAREA:xxx', where xxx can be anything and MYAREA is a
logical area defined before starting AIPS in the usual
way). If OUTPRINT gives only a logical name, then the
name HOLOnn-mmppii is used where nn is the reference
antenna (BASELINE(j)), mm is the antenna (or 0 if
multiple), pp are 2 letters giving the polarization, and
ii is the IF. If xxx is not blank, then the output name
is xxx (any number of letters) with ppii concatenated.
If OUTPRINT is blank, then the disk area where you were
when you started AIPS is used. If OUTPRINT = 'xxx', xxx
will be taken to be a disk area environment name.
Adverbs for PLOT mode:
PIXRANGE...If PIXR(1) < PIXR(2), all plots will be from PIXR(1) to
PIXR(2). Otherwise each plot will be self-scaling.
FACTOR.....Scale plot symbols by FACTOR 0 -> 1.
If FACTOR < 0, draw lines between the points and use
abs(FACTOR) to scale the points plotted.
SYMBOL.....Choices are
1: Plus sign 13: Star of David
2: Cross (X) 14: Seven-pointed star
3: Circle 15: Eight-pointed star
4: Box 16: Nine-pointed star
5: Triangle 17: Ten-pointed star
6: Diamond 18: 11-pointed star
7: Pentagon 19: 12-pointed star
8: Hexagon 20: 13-pointed star
9: Septagon 21: 14-pointed star
10: Octagon 22: Plus (+) with gap
11: Nine-gon 23: Cross (X) with gap
12: Five pointed star 24: Vertical line
DO3COLOR...<= 0 use line type 4 for all points plotted
> 0 use up to 4 line types for polarizations with yellow
for I, RR, VV, green for Q. LL, HH, pink for U, RL,
VH, and cyan for V, LR, VH. The colors will be
different if you have changed the standard graphics
colors. The Stokes string for each color will
appear in the upper left of the plot.
NOTE: GRCHAN must be 0 for this to work.
LTYPE......Labelling type, see HELP LTYPE for details:
1 = border, 2 = no ticks, 3 or 7 = standard, 4 or 8 =
relative to ref. pixel, 5 or 9 = relative to subimage
(BLC, TRC) center, 6 or 10 = pixels. 7-10 all labels
other than tick numbers and axis type are omitted.
Less than 0 is the same except that the plot file
version number and create time are omitted.
Add n * 100 to alter the metric scaling.
DOTV.......> 0 => plot directly on the TV device, otherwise make a
plot file for later display on one or more devices
(including the TV if desired). Leave 0 if DO3COLOR > 0.
GRCHAN.....Graphics channel (1 - 7) to use for line drawing.
A value of 0 causes more than one graphics channel to be
used.
XYRATIO....Scale the X axis longer than the Y by XYRATIO.
If DOTV > 0, 0 -> fit to the TV window
If DOTV <= 0, 0 -> 1.
BADDISK....Disk numbers to avoid for scratch files. Scratch files may
be created by the sorting routines if calibration or
flagging is applied.
EXPLAIN SECTION
Special notes on holography data HOLG modes FOR THE OLD VLA.
EVLA does not use the 40000 offset but forces the source name
to HOLORASTER.
(1) Any included data that does not have a W > 40000 is assumed to be
calibrator data and is ignored. The source qualifier of
holography data must be at least 40000, that of calibrators must
be less than 40000.
(2) The W term is expected to be 40000 + 256*subqualifier + mode,
where mode is supposed to be > 0. When mode is 0, the data are
assumed to be taken during an antenna turn-around phase and are
discarded.
(3) When printing in these modes, the 40000 and n*256 parts of W are
dropped.