[daip] [!10247]: AIPS - AIPS Unflagging question

[Robert Gray]

Robert Gray updated #10247
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AIPS Unflagging question
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           Ticket ID: 10247
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/10247
           Full Name: Robert Gray
               Email: roberthansengray at gmail.com
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 01 May 2017 03:28 PM
             Updated: 01 May 2017 03:28 PM
                 Due: 03 May 2017 03:28 PM (2d 0h 0m)
      Resolution Due: 09 May 2017 03:28 PM (8d 0h 0m)



Hi!

I'm getting FITS files from the Allen Telescope Array which have been initially flagged (mostly bad antennas, sometimes bad channels) and calibrated, and I import them to AIPS and flag more carefully before imaging and feature finding.  I would like to REMOVE the flagging on some channels, but don't see how to do that because there is no FG table--is there a way?  

The fellow I'm working with, Gerry Harp, thinks flagged antennas are not included in the FITS file by his Miriad software, but that flagged channels are retained and could be unflagged, although neither of us knows how to do that without a FG table.  I do see that AIPS knows something about what's been flagged:   "FITLD1: UVFDAT: found      22685 spectra samples already flagged".  I'm including the import messages below, with an IMH that shows the tables that AIPS finds.

Thanks for any advice on this!

Bob Gray

FITLD1: Task FITLD  (release of 31DEC16) begins
FITLD1: Found wowcente observed on 20-SEP-2016
FITLD1: WARNING! STOKES VALUES NOT CONVERTED TO NORMAL FORMS
FITLD1: Create 160920WOW-X .UVATA .   1 (UV)  on disk  1  cno    2
FITLD1: UVFDAT: counts for cross-correlations
FITLD1: UVFDAT: found      22685 spectra samples already flagged
FITLD1: UVFDAT: found     24.055 percent samples already flagged
FITLD1: UVFDAT: omitted      22685 totally flagged vis records
FITLD1: RNXINI: DATA NOT IN TIME ORDER => NO NX TABLE
FITLD1: NXCHCK: ERROR   1 ON INIT INDEX TABLE (RE)WRITE
FITLD1: Image=wowcente  (UV)         Filename=160920WOW-X .UVATA .   1
FITLD1: Telescope=ATA                Receiver=ATA
FITLD1: Observer=                    User #= 1111
FITLD1: Observ. date=20-SEP-2016     Map date=01-MAY-2017
FITLD1: # visibilities     71620     Sort order
FITLD1: Rand axes: UU-L  VV-L  WW-L  SUBARRAY  TIME1  ANTENNA1  ANTENNA2
FITLD1: ----------------------------------------------------------------
FITLD1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
FITLD1: COMPLEX      3   1.0000000E+00       1.00  1.0000000E+00    0.00
FITLD1: STOKES       1  -5.0000000E+00       1.00 -1.0000000E+00    0.00
FITLD1: FREQ      1024   1.4124464E+09       1.00  1.2800000E+04    0.00
FITLD1: RA           1    19 26 56.509       1.00       3600.000    0.00
FITLD1: DEC          1   -26 56 59.988       1.00       3600.000    0.00
FITLD1: ----------------------------------------------------------------
FITLD1: Coordinate equinox 2000.00
FITLD1: Rest freq   1419.000         Vel type: RADIO   wrt LSR
FITLD1: Alt ref. value  1.38458E+06  wrt pixel    1.00
FITLD1: Maximum version number of extension files of type HI is   1
FITLD1: Maximum version number of extension files of type AN is   1
FITLD1: Appears to have ended successfully
FITLD1: localhos 31DEC16 TST: Cpu=      3.7  Real=      4  IO=       842
AIPS 1: Resumes
>default UVSRT; getn 2; outname '160920WOW-X'; outclass 'UVATA';
AIPS 1: Got(1)   disk= 1  user=1111   type=UV   160920WOW-X.UVATA.1
>outseq 1; sort 'TB'; docrt 132; 
>inp
AIPS 1: UVSRT:  Task which sorts UV data
AIPS 1: Adverbs     Values                 Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: INNAME     '160920WOW-X'           Input UV file name (name)
AIPS 1: INCLASS    'UVATA'                 Input UV file name (class)
AIPS 1: INSEQ         1                    Input UV file name (seq. #)
AIPS 1: INDISK        1                    Disk unit # of input UV data
AIPS 1: OUTNAME    '160920WOW-X'           Sorted UV file name (name)
AIPS 1: OUTCLASS   'UVATA'                 Sorted UV file name (class)
AIPS 1: OUTSEQ        1                    Sorted UV file name (seq. #)
AIPS 1: OUTDISK       1                    Disk unit # of sorted UV data
AIPS 1:                                      0 => highest with space
AIPS 1:                                    If outfile spec. equals the
AIPS 1:                                    infile spec., output will
AIPS 1:                                    overwrite the input
AIPS 1: BADDISK    *all 0                  Disk drive #'s to avoid
AIPS 1: SORT       'TB'                    Two char. sort order, eg.'XY'
AIPS 1:                                    blank => 'XY'
AIPS 1: ROTATE        0                    Angle thru which to rotate.
AIPS 1:                                    positive rotates CCW
AIPS 1: DEFER         0                    Defer output file creation?
>go
UVSRT1: Task UVSRT  (release of 31DEC16) begins
UVSRT1: UVCREA: DUPLICATE NAME 160920WOW-X .UVATA .   1
UVSRT1: Appears to have ended successfully
UVSRT1: localhos 31DEC16 TST: Cpu=      3.7  Real=      4  IO=      6733
AIPS 1: Resumes

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