[daip] FITLD problems

[李俊铎]

Dear sir or madam,

We got the data from WSRT in UVFIT format, but some of the files are unable to load in AIPS with FITLD correctly. 

Error messages are as follows (pictures get from screen), there are two kinds of errors.


In this condition, the data are actually there and has a header we can read, but we have no idea whether the data has been loaded correctly.



In this condition, the data are not loaded, we cannot find it with UCAT.

My OS is Fedora 13. AIPS version is 31DEC10. 

The parameter values that we have set is as follow:

AIPS 1: FITLD:  Task to store an image or UV data from a FITS tape
AIPS 1: Adverbs     Values                 Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: INTAPE        1                    Input tape drive # (0 => 1)
AIPS 1: NFILES        0                    # of files to advance on tape
AIPS 1: DATAIN     'FITS:11002869_S0_T0_FM Disk file name
AIPS 1:            0.UVF'
AIPS 1: OUTNAME    'X0'                    File name (name)
AIPS 1: OUTCLASS   ' '                     File name (class)
AIPS 1: OUTSEQ        0                    File name (seq. #)
AIPS 1:                                       0 => highest unique number
AIPS 1:                                         => matching (on VLBA)
AIPS 1:                                      -1 => FITS tape value
AIPS 1: OUTDISK       0                    Disk drive # (0 => any)
AIPS 1: OPTYPE     ' '                     Type of data to load,
AIPS 1:                                    '  ' => all types
AIPS 1:                                    'UV' => UV data
AIPS 1:                                    'IM' => images
AIPS 1: NCOUNT        0                    Number of files to load.
AIPS 1: DOTABLE       1                    True (1.0) means load tables
AIPS 1:                                    for images.
AIPS 1: DOUVCOMP      1                    >0 => compressed data (FITS)
AIPS 1: DOCONCAT     -1                    >0 -> if VLBA correlator data
AIPS 1:                                    append data to existing
AIPS 1:                                    files, or if no appropriate
AIPS 1:                                    files exist create a new file
AIPS 1:                                    and append all data to that
AIPS 1:                                    file.
AIPS 1:                                    *****************************
AIPS 1:                                    Following adverbs are useful
AIPS 1:                                    only when reading VLBA
AIPS 1:                                    distribution tapes.
AIPS 1:                                    *****************************
AIPS 1: CLINT         0                    CL entry interval (min)
AIPS 1:                                    0 => 1 minute.
AIPS 1: SOURCES    *all ' '                Source list to accept.
AIPS 1: QUAL         -1                    Source qualifier -1=>all
AIPS 1: TIMERANG   *all 0                  Timerange selected
AIPS 1: BCHAN         1                    Lowest spectral channel
AIPS 1:                                    number to select in each IF.
AIPS 1:                                    0=>1
AIPS 1: ECHAN         0                    Highest spectral channel
AIPS 1:                                    number to select in each IF.
AIPS 1:                                    0=>highest
AIPS 1: BIF           1                    Lowest IF number 0=>1
AIPS 1: EIF           1                    Highest IF number 0=>all
AIPS 1: DIGICOR       1                    Controls the application of
AIPS 1:                                    the VLBA correlator's digital
AIPS 1:                                    correction.
AIPS 1:                                    0 or 1 => perform corrections
AIPS 1:                                    2 => perform cross-power
AIPS 1:                                      corrections, do total-power
AIPS 1:                                      only if zero padding used.
AIPS 1:                                    -1 => do NOT perform
AIPS 1:                                      corrections.
AIPS 1:                                    SEE HELP for more details
AIPS 1: SELBAND      -1                    Bandwidth to select (kHz)
AIPS 1: SELFREQ      -1                    Frequency to select (MHz).
AIPS 1:                                    See HELP.
AIPS 1: FQTOL        -1                    Frequency tolerance assigned
AIPS 1:                                    to SELFREQ, FITLD will select
AIPS 1:                                    data with freq. of SELFREQ
AIPS 1:                                    +/- FQTOL.
AIPS 1:                                    The unit of FQTOL is kHz.
AIPS 1:                                    <=0 => 10 kHz
AIPS 1: WTTHRESH      0                    Flagging threshold based on
AIPS 1:                                    weights. See HELP.
AIPS 1:                                    0 => no flagging
AIPS 1:                                    1 => will flag ALL data
AIPS 1: OPCODE     ' '                     Specify if wish to keep VT
AIPS 1:                                    (VLBA Tape Statistics) table
AIPS 1:                                    and other tables.  See HELP.
AIPS 1:                                    '  ' => do not save tables
AIPS 1: NPIECE        0                    Maximum uv table piece to
AIPS 1:                                    load (ignored for tape unless
AIPS 1:                                    NCOUNT = 1)
AIPS 1: ERROR       2                    >= 2 -> do not use AIPS
AIPS 1:                                    history in the FITS file
AIPS 1: ANTNAME    *all ' '                List antenna station names in
AIPS 1:                                    desired order (IDI data only)


We do not understand what in the cause of an error. We try to read them in different versions of AIPS and try to load them with other task like UVLOD, but it does not make a different.

Could you help on this? Does it indicate that the files were corrupted?

Thanks in advance!

Best wishes,

Junduo Li
  
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