[daip] IMAGR problem

[Adam Deller]

Hi Eric,

Ahah.  I had assumed, incorrectly, that cellsize was the total size of
the image, not the size of a pixel.  That is pretty obvious in
hindsight.  And when I entered CLBOX I think may have messed up the
ordering of the array indices (and entered one value in asec instead
of mas) - thanks for pointing that out.  I'm cleaning happily now.

Cheers,
Adam

On Mon, Mar 2, 2009 at 9:40 AM, Eric Greisen <egreisen at nrao.edu> wrote:
> Adam Deller wrote:
>>
>> Hi,
>>
>> I am having trouble getting IMAGR to run on a VLBA dataset.  It complains:
>>
>> marath> IMAGR1: Task IMAGR  (release of 31DEC09) begins
>> marath> IMAGR1: UVGET: Using flag table version   1 to edit data
>> marath> IMAGR1: Create BD141B_H_UG .IMAGR .   1 (UV)  on disk  1  cno   29
>> marath> IMAGR1: Beginning channel    1 through   15 with  4 IFs
>> marath> IMAGR1: IMACPY: NO DATA SELECTED
>> marath> IMAGR1: IMACPY: ERROR COPYING Input UVdata
>> marath> IMAGR1: TO UVdata work object
>> marath> IMAGR1: Blanking channel    1 image plane
>> marath> IMAGR1: OBRGET: KEYWORD CNO NOT FOUND
>> marath> IMAGR1: KEYWORD =CNO
>> marath> IMAGR1: OBRGET: PROBLEM WITH OBJECT: CLEAN field number 0001
>> marath> IMAGR1: IMABLK: ERROR BLANKING CLEAN field number 0001
>> marath> IMAGR1: NO DATA FOUND
>>
>> I have checked and double-checked the inputs to ensure that the
>> correct data is being selected, and I can't see where I'm going wrong.
>>  The inputs are shown below.  I have checked with UVPLT that the
>> source name is correct and the data isn't being flagged or something -
>> I can see everything fine in UVPLT. This is the first time I have
>> tried to use IMAGR seriously so I'm afraid I'm doing something
>> bone-headed, but I just can't see it.
>
>> AIPS 1: CELLSIZE      0.256       0.256    (X,Y) size of grid in asec
>> AIPS 1: IMSIZE      512         512        Minimum image size
>
> That is rather a large cellsize for VLBI - IMACPY drops all data at spacings
> too large for the UV grid which is about the only way it would differ from
> UVPLT.
>
> I notices that NBOXES=1, but CLBOX is nonsense.
>
> Eric Greisen
>
>



-- 
!=============================================================!
Dr. Adam Deller                            Ph  +1 575 835 7492
Jansky Fellow                               Fax +1 575 835 7027
National Radio Astronomy Observatory
Socorro NM 87801, USA
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