[daip] DBCON problem
Amy Mioduszewski
amiodusz at nrao.edu
Thu Jul 26 18:21:51 EDT 2007
Hi Lauren,
Sorry it took me so long to get back to you. What was your "sum of the gridding
weights" for your two data sets? Also look you DBCONed data with UVPLT (or some
such), does it look sensible. I have had experience in the past when DBCON
seemed to introduce high amplitudes (but I could never get it to repeat). Also
could you send me you DBCON output?
Thanks!
Amy
Lauren E. Davis wrote:
> I am trying to combine two data sets, CD observvations from 1998, and B
> array from 2001. When I combine them using DBCON, I actually obtain a
> _higher_ flux integral. All I can guess is that I don't understand the
> reweight parameter -- from the help file I thought that I would be able
> to set it to zero for these data. Could you suggest anything? The data
> headers and the DBCON parameters are attached below. Thanks very much
> for any help,
>
> Lauren Davis
>
>
> Image=NGC157 (UV) Filename=N157CD .UVSRT . 2
> AIPS 2: Telescope=VLA Receiver=VLA
> AIPS 2: Observer=AR326 User #= 27
> AIPS 2: Observ. date=27-OCT-1994 Map date=26-AUG-2004
> AIPS 2: # visibilities 57345 Sort order TB
> AIPS 2: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN BASELINE TIME1
> AIPS 2: WEIGHT SCALE
> AIPS 2: ----------------------------------------------------------------
> AIPS 2: Type Pixels Coord value at Pixel Coord incr Rotat
> AIPS 2: COMPLEX 1 1.0000000E+00 1.00 1.0000000E+00 0.00
> AIPS 2: STOKES 4 1.0000000E+00 1.00 1.0000000E+00 0.00
> AIPS 2: FREQ 63 1.4128414E+09 32.00 2.4414061E+04 0.00
> AIPS 2: IF 2 1.0000000E+00 1.00 1.0000000E+00 0.00
> AIPS 2: RA 1 00 34 46.500 1.00 3600.000 0.00
> AIPS 2: DEC 1 -08 23 48.000 1.00 3600.000 0.00
> AIPS 2: ----------------------------------------------------------------
> AIPS 2: Coordinate equinox 2000.00
> AIPS 2: Rest freq 1420.406 Vel type: OPTICAL wrt SUN
> AIPS 2: Alt ref. value 1.59054E+06 wrt pixel 32.00
> AIPS 2: Maximum version number of extension files of type HI is 1
> AIPS 2: Maximum version number of extension files of type AN is 2
> AIPS 2: Maximum version number of extension files of type FQ is 1
> AIPS 2: Keyword = 'MAXBLINE' value = 1.592897E+04
>
>
>
> AIPS 2: Image=MULTI (UV) Filename=NGC157 .LINE . 3
> AIPS 2: Telescope=VLA Receiver=VLA
> AIPS 2: Observer=AB992 User #= 27
> AIPS 2: Observ. date=28-APR-2001 Map date=24-APR-2003
> AIPS 2: # visibilities 1238147 Sort order TB
> AIPS 2: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN BASELINE TIME1
> AIPS 2: SOURCE FREQSEL WEIGHT SCALE
> AIPS 2: ----------------------------------------------------------------
> AIPS 2: Type Pixels Coord value at Pixel Coord incr Rotat
> AIPS 2: COMPLEX 1 1.0000000E+00 1.00 1.0000000E+00 0.00
> AIPS 2: FREQ 63 1.4129849E+09 32.00 2.4414062E+04 0.00
> AIPS 2: STOKES 2 -1.0000000E+00 1.00 -1.0000000E+00 0.00
> AIPS 2: IF 2 1.0000000E+00 1.00 1.0000000E+00 0.00
> AIPS 2: RA 1 00 00 00.000 1.00 3600.000 0.00
> AIPS 2: DEC 1 00 00 00.000 1.00 3600.000 0.00
> AIPS 2: ----------------------------------------------------------------
> AIPS 2: Coordinate equinox 2000.00
> AIPS 2: Rest freq 1420.406 Vel type: OPTICAL wrt SUN
> AIPS 2: Alt ref. value 1.56625E+06 wrt pixel 32.00
> AIPS 2: Maximum version number of extension files of type HI is 1
> AIPS 2: Maximum version number of extension files of type AN is 1
> AIPS 2: Maximum version number of extension files of type NX is 1
> AIPS 2: Maximum version number of extension files of type SU is 1
> AIPS 2: Maximum version number of extension files of type FQ is 1
> AIPS 2: Maximum version number of extension files of type CL is 2
> AIPS 2: Maximum version number of extension files of type TY is 1
> AIPS 2: Maximum version number of extension files of type BP is 1
> AIPS 2: Maximum version number of extension files of type FG is 5
> AIPS 2: Maximum version number of extension files of type PL is 4
> AIPS 2: Keyword = 'OBSCHANS' value = 64
> AIPS 2: Keyword = 'CORRMODE' value = '4 '
> AIPS 2: Keyword = 'SELCHANS' value = 63
> AIPS 2: Keyword = 'VLAIFS ' value = 'ABCD '
>
>
>
> AIPS 2: DBCON Task which concatenates two uv data bases .
> AIPS 2: Adverbs Values Comments
> AIPS 2: ----------------------------------------------------------------
> AIPS 2: INNAME 'N157CD ' Input UV file name (name)
> AIPS 2: INCLASS 'UVSRT ' Input UV file name (class)
> AIPS 2: INSEQ 2 Input UV file name (seq. #)
> AIPS 2: INDISK 1 Input UV file disk unit #
> AIPS 2: IN2NAME 'NGC157 ' 2nd input file name.
> AIPS 2: IN2CLASS 'SPLIT ' 2nd input file class.
> AIPS 2: IN2SEQ 2 2nd input file seq. #
> AIPS 2: IN2DISK 2 2nd input file disk number
> AIPS 2: REWEIGHT 0 0 Weight factors.
> AIPS 2: OUTNAME '157BCD14 ' Output UV file name (name)
> AIPS 2: OUTCLASS ' ' Output UV file name (class)
> AIPS 2: OUTSEQ 0 Output UV file name (seq. #)
> AIPS 2: OUTDISK 5 Output UV file disk unit #.
> AIPS 2: DOPOS 1 1 If (1,1) true (+1) check pos.
> AIPS 2: 1 1 will shift second if nec.
> AIPS 2: 1 1 If (2,1) true check freq.
> AIPS 2: 1 1
> AIPS 2: DOARRAY -1 If true (+1) output data will
> AIPS 2: be the same subarray as input
>
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