[daip] [!6487]: aips - Problems with DBCON - 31DEC15
Gabriela Castelletti
do-not-reply at nrao.edu
Mon Apr 20 15:05:36 EDT 2015
Gabriela Castelletti updated #6487
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Problems with DBCON - 31DEC15
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Ticket ID: 6487
URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/6487
Full Name: Gabriela Castelletti
Email: gcastell at iafe.uba.ar
Creator: User
Department: AIPS Data Processing
Staff (Owner): -- Unassigned --
Type: Issue
Status: Open
Priority: Default
SLA: NRAO E2E
Template Group: Default
Created: 20 April 2015 07:05 PM
Updated: 20 April 2015 07:05 PM
Due: 22 April 2015 07:05 PM (2d 0h 0m)
Resolution Due: 28 April 2015 07:05 PM (8d 0h 0m)
To whom it may concern,
I am working on two GMRT data sets obtained on February 15 and 17 (in fact, I also have a third data set observed on 18Feb, please see below).
I am having difficulty combining the first two data sets using DBCON in 31DEC15 AIPS version.
The inputs that I used are the following:
AIPS 1: INNAME 'J1731feb15' dataset obtained Feb15
AIPS 1: INCLASS 'SPLIT'
AIPS 1: INSEQ 1
AIPS 1: INDISK 1
AIPS 1: IN2NAME 'J1731feb17' datase obtained Feb17
AIPS 1: IN2CLASS 'SPLIT'
AIPS 1: IN2SEQ 1
AIPS 1: IN2DISK 1
AIPS 1: REWEIGHT 0 0
AIPS 1: OUTNAME 'J1731feb1517'
AIPS 1: OUTCLASS ' '
AIPS 1: OUTSEQ 0
AIPS 1: OUTDISK 1
AIPS 1: DOPOS 1 1
AIPS 1: 1 1
AIPS 1: 1 1
AIPS 1: 1 0
AIPS 1: DOARRAY -1
AIPS 1: FQCENTER 1
The message from DBCON is:
localh> DBCON1: Task DBCON (release of 31DEC15) begins
localh> DBCON1: Scaling u,v,w of data set 1 by 1.0263917E+00
localh> DBCON1: Scaling u,v,w of data set 2 by 1.0263917E+00
localh> DBCON1: UV DATA TYPES ARE INCOMPATIBLE
localh> DBCON1: Purports to die of UNNATURAL causes
Both inputs files are single source data set, their headers are:
AIPS 1: Image=J1731-34 (UV) Filename=J1731feb15 .SPLIT . 1
AIPS 1: Telescope=GMRT Receiver=GMRT
AIPS 1: Observer= User #= 353
AIPS 1: Observ. date=14-FEB-2015 Map date=31-MAR-2015
AIPS 1: # visibilities 576457 Sort order TB
AIPS 1: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN BASELINE TIME1
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat
AIPS 1: COMPLEX 3 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: STOKES 2 -1.0000000E+00 1.00 -1.0000000E+00 0.00
AIPS 1: FREQ 41 5.9204167E+08 1.00 7.8125000E+05 0.00
AIPS 1: IF 1 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: RA 1 17 32 03.415 1.00 3600.000 0.00
AIPS 1: DEC 1 -34 45 16.603 1.00 3600.000 0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Rest freq 533.333 Vel type: RADIO wrt YOU
AIPS 1: Alt ref. value 0.00000E+00 wrt pixel 1.00
AIPS 1: Maximum version number of extension files of type NX is 1
AIPS 1: Maximum version number of extension files of type FQ is 1
AIPS 1: Maximum version number of extension files of type HI is 1
AIPS 1: Maximum version number of extension files of type AN is 1
AIPS 1: Maximum version number of extension files of type FG is 4
and for the 17Feb data:
AIPS 1: Image=J1731-34 (UV) Filename=J1731feb17 .SPLIT . 1
AIPS 1: Telescope=GMRT Receiver=GMRT
AIPS 1: Observer= User #= 353
AIPS 1: Observ. date=16-FEB-2015 Map date=08-APR-2015
AIPS 1: # visibilities 419578 Sort order TB
AIPS 1: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN SUBARRAY TIME1
AIPS 1: ANTENNA1 ANTENNA2
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat
AIPS 1: COMPLEX 3 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: STOKES 2 -1.0000000E+00 1.00 -1.0000000E+00 0.00
AIPS 1: FREQ 41 5.9204167E+08 1.00 7.8125000E+05 0.00
AIPS 1: IF 1 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: RA 1 17 32 03.415 1.00 3600.000 0.00
AIPS 1: DEC 1 -34 45 16.603 1.00 3600.000 0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Rest freq 533.333 Vel type: RADIO wrt YOU
AIPS 1: Alt ref. value 0.00000E+00 wrt pixel 1.00
AIPS 1: Maximum version number of extension files of type NX is 1
AIPS 1: Maximum version number of extension files of type FQ is 1
AIPS 1: Maximum version number of extension files of type HI is 1
AIPS 1: Maximum version number of extension files of type AN is 1
AIPS 1: Maximum version number of extension files of type FG is 5
I do not understand "the incompatibility in the uv" that DBCON found.
Looking for an answer to my problem, I tried to combine the 17Feb data set with a third data set taken on 18Feb. Using the same
inputs as above, except that the first and second files are now J1731feb17.SPLIT.1 and J1731feb18.SPLIT.1, the message from DBCON is:
localh> DBCON1: Task DBCON (release of 31DEC15) begins
localh> DBCON1: Scaling u,v,w of data set 1 by 1.0263917E+00
localh> DBCON1: Scaling u,v,w of data set 2 by 1.0263917E+00
localh> DBCON1: RA DOES NOT MATCH, BUT NOT DOING SHIFTS!
localh> DBCON1: UVPGET: RANDOM PARMS NOT ALL THERE: 0 1 2 4 -1 -1 -1 -1 -1
localh> 3 5 -1
This is completely different to the former DBCON message. Probably it is indicating a new problem
with the data sets used this time.
Just in case, the header corresponding to the file named J1731feb18.SPLIT.1 is
AIPS 1: Image=J1731-34 (UV) Filename=J1731feb18 .SPLIT . 1
AIPS 1: Telescope=GMRT Receiver=GMRT
AIPS 1: Observer= User #= 353
AIPS 1: Observ. date=17-FEB-2015 Map date=17-APR-2015
AIPS 1: # visibilities 450240 Sort order TB
AIPS 1: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN SUBARRAY TIME1
AIPS 1: ANTENNA1 ANTENNA2
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat
AIPS 1: COMPLEX 3 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: STOKES 2 -1.0000000E+00 1.00 -1.0000000E+00 0.00
AIPS 1: FREQ 41 5.9204167E+08 1.00 7.8125000E+05 0.00
AIPS 1: IF 1 1.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: RA 1 17 32 03.415 1.00 3600.000 0.00
AIPS 1: DEC 1 -34 45 16.603 1.00 3600.000 0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Rest freq 533.333 Vel type: RADIO wrt YOU
AIPS 1: Alt ref. value 0.00000E+00 wrt pixel 1.00
AIPS 1: Maximum version number of extension files of type NX is 1
AIPS 1: Maximum version number of extension files of type FQ is 1
AIPS 1: Maximum version number of extension files of type HI is 1
AIPS 1: Maximum version number of extension files of type AN is 1
AIPS 1: Maximum version number of extension files of type FG is 3
I really appreciate your help to solve these problems, because I have not any idea what is wrong. Both DBCON results
are a surprise for me. I know that originally GMRT data had problems to concatenate LTB and LTA sidebands, and that a couple
of scripts were written to deal with this. However, from the header of my three data sets you can see that IF=1, so I suspect that the
LTA and LTB bands are not the cause that DBCON doesn't work.
Thank you very much in advance,
Best Regards,
Gabriela Castelletti
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