[daip] Difficulty with DBCON

[Eric Greisen]

Doug Gobeille wrote:
> Hey there,
> 
> I'm trying to concatenate two databases in DBCON and I'm encountering an 
> unexpected error. I looked through the previous DAIP logs and found two 
> similar cases, but neither fits mine.
> 
> The error I get is:
> 
> DBCON1: Task DBCON  (release of 31DEC11) begins
> DBCON1: RA does not match, will shift second
> DBCON1: IF       AXIS HAS UNEQUAL ATTRIBUTES
> DBCON1: Purports to die of UNNATURAL causes
> DBCON1: localhost    31DEC11 TST: Cpu=       0.0  Real=       0
> AIPS 1: Resumes
> 
> The image headers for the two files are:
> 
> FITLD1: Image=0846+100  (UV)         Filename=0846+100    .SPLIT .   1
> FITLD1: Telescope=VLA                Receiver=VLA
> FITLD1: Observer=GOWE                User #= 3666
> FITLD1: Observ. date=17-APR-1982     Map date=22-DEC-2012
> FITLD1: # visibilities     18096     Sort order  TB
> FITLD1: Rand axes: UU-L-SIN  VV-L-SIN  WW-L-SIN  BASELINE  TIME1
> 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       4  -1.0000000E+00       1.00 -1.0000000E+00    0.00
> FITLD1: FREQ         1   1.4649000E+09       1.00  5.0000000E+07    0.00
> FITLD1: IF           1   1.0000000E+00       1.00  1.0000000E+00    0.00
> FITLD1: RA           1    08 49 39.716       1.00       3600.000    0.00
> FITLD1: DEC          1    09 49 30.499       1.00       3600.000    0.00
> FITLD1: ----------------------------------------------------------------
> FITLD1: Coordinate equinox 2000.00
> FITLD1: Rest freq      0.000         Vel type: OPTICAL wrt YOU
> FITLD1: Alt ref. value  0.00000E+00  wrt pixel    1.00
> 
> 
> FITLD1: Image=0846+100  (UV)         Filename=0846+100    .SPLIT .   2
> FITLD1: Telescope=VLA                Receiver=VLA
> FITLD1: Observer=AE80                User #= 3666
> FITLD1: Observ. date=19-DEC-1991     Map date=22-DEC-2012
> FITLD1: # visibilities     24570     Sort order  TB
> FITLD1: Rand axes: UU-L-SIN  VV-L-SIN  WW-L-SIN  BASELINE  TIME1
> 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       4  -1.0000000E+00       1.00 -1.0000000E+00    0.00
> FITLD1: FREQ         1   1.4649000E+09       1.00  5.0000000E+07    0.00
> FITLD1: IF           2   1.0000000E+00       1.00  1.0000000E+00    0.00
> FITLD1: RA           1    08 49 39.716       1.00       3600.000    0.00
> FITLD1: DEC          1    09 49 30.499       1.00       3600.000    0.00
> FITLD1: ----------------------------------------------------------------
> FITLD1: Coordinate equinox 2000.00
> FITLD1: Rest freq      0.000         Vel type: OPTICAL wrt YOU
> FITLD1: Alt ref. value  0.00000E+00  wrt pixel    1.00

You will notice that the 2 data sets have different numbers of IFs and 
so the concatenation fails on the face of it.  The easiest thing to do 
would be to separate the 2nd data set with UVCOP into 2 files each with 
1 IF and then concatenate them.

ERic Greisen