[daip] IMAGR problem

[Eric Greisen]

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