[daip] SETFC

[Claire Chandler]

OK, it looks like the error is in the input file I used (or rather, the 
error is in the way SETFC deals with the kinds of files I used).  It seems 
we're in good shape, I'll pass this problem on to Eric.

Claire

On Tue, 13 Mar 2007, Lynn D. Matthews wrote:

> I get the same thing as you if I use the same input file and set
> BPARM(1)=5.7e-05. But doesn't the result imply that we could safely image
> a field ten times larger than we're imaging? Perhaps this is what I'm
> misinterpreting. Also, I had instead been setting BPARM(1)=0 and
> BPARM(9)=x, where I had thought the latter was supposed to set the maximum
> phase error we were willing to tolerate. The result I got for maximum
> field size was comparable to my by-hand estimate, so I thought it seemed
> reasonable.
>
> Interestingly, I find the program produces a comparable result either on a
> single-channel SPLAT file or on a multi-source file, but it fails on a
> multi-channel, single-source file.
>
> Lynn
>
> On Tue, 13 Mar 2007, Claire Chandler wrote:
>
>>> Yes, I was using just one channel (from Epoch M) as an input to SETFC.
>>> It then reports  max baseline, W = 1.2296E+09 7.5396E+08 wavelengths.
>>> I just tried again with a multi-channel SPLAT file, but I then
>>> get the message:  NO DATA FOUND: SET IMSIZE, CELLSIZE
>>
>> That's bizarre.  This is what I get:
>>
>>> inp
>> AIPS 1: SETFC:  Task to make a BOXFILE for input to IMAGR
>> AIPS 1: Adverbs     Values                 Comments
>> AIPS 1: ----------------------------------------------------------------
>> AIPS 1: INNAME     'BG118MRF1211'          UV dataset name (name)
>> AIPS 1: INCLASS    'SPLAT'                 UV dataset name (class)
>> AIPS 1: INSEQ         2                    UV dataset name (seq. #)
>> AIPS 1: INDISK        3                    Disk drive #
>> AIPS 1: SOURCES    *all ' '                Source selected
>> AIPS 1: BCOUNT        1                    First field number to use
>> AIPS 1: BOXFILE    'HOME:SETFCTEST'
>> AIPS 1:                                    disk file to write to (the
>> AIPS 1:                                    input BOXFILE for IMAGR)
>> AIPS 1: CELLSIZE      0           0        (X,Y) size of grid in asec
>> AIPS 1: IMSIZE        0           0        field size
>> AIPS 1: SHIFT         0           0        Position shift (RA,Dec) asec
>> AIPS 1:                                    for all fields
>> AIPS 1: FLUX          0                    Minimum component flux =
>> AIPS 1:                                    (source * beam)
>> AIPS 1: BPARM      5.700E-05   *rest 0     (1) Inner region radius (deg)
>> AIPS 1:                                    (2) Field overlap (pixels)
>> AIPS 1:                                    (3) Factor to scale NVSS
>> AIPS 1:                                        fluxes, 0 -> 1
>> AIPS 1:                                    (4) Radius NVSS search (deg)
>> AIPS 1:                                    (5) Flux limit in NVSS (Jy)
>> AIPS 1:                                    (6) IMSIZE for NVSS fields
>> AIPS 1:                                    (7) IMSIZE for Sun fields
>> AIPS 1:                                    (8) Write Clean boxes for
>> AIPS 1:                                        NVSS fields
>> AIPS 1:                                    (9) Maximum allowed phase
>> AIPS 1:                                        error in imaging
>> AIPS 1:                                    (10) Points per beaam
>> AIPS 1: PBPARM     *all 0                  Beam parameters:
>> AIPS 1:                                    (1) Cutoff; (2) Use (3)-(7)
>> AIPS 1:                                    (3)-(7) Beam shape parms
>> AIPS 1: INFILE     ' '
>> AIPS 1:                                    NVSS input file name
>> AIPS 1:                                    ' ' => AIPS provided.
>>
>> habane> SETFC1: Task SETFC  (release of 31DEC07) begins
>> habane> SETFC1: Found BG118MRF1211SPLAT  Seq   2 Disk:  3 in slot   13
>> habane> SETFC1: SETCEL: max baseline, W = 1.2296E+09 7.5396E+08 wavelengths
>> habane> SETFC1: SETCEL: max field radius 4.3370E+00 arc seconds
>> habane> SETFC1: SETCEL: recommends IMSIZE  7339 CELLSIZE   0.00006
>> habane> SETFC1: SETCEL: returns    IMSIZE  8192 CELLSIZE   0.00006
>> habane> SETFC1: ZTXOP2: using translated file name =
>> habane> SETFC1: ZTXOP2: /users/cchandle/SETFCTEST
>> habane> SETFC1: FLYEYE added   1 fields to BOXFILE to  0.000 deg
>> habane> SETFC1: WARNING: THIS MAY NOT COVER THE DESIRED AREA
>> habane> SETFC1: First field number written was   1
>> habane> SETFC1: Highest field number written was   1
>> habane> SETFC1: returns adverbs to AIPS
>> habane> SETFC1: Appears to have ended successfully
>> habane> SETFC1: habanero     31DEC07 TST: Cpu=       0.3  Real=       1
>>
>> Then when I check the inputs to SETFC again I see
>>
>> AIPS 1: CELLSIZE   5.592E-05   5.592E-05   (X,Y) size of grid in asec
>> AIPS 1: IMSIZE     8192        8192        field size
>>
>