[daip] AIPS error help

[Ramana Athreya]

On Mon, Dec 15, 2008 at 2:57 AM, Eric Greisen <egreisen at nrao.edu> wrote:
>> -----------------------------------------------------------------------
>> ERROR MESSAGE
>> UVSUB1: ALGSTB: Pass   1;  136-   0 Cells, with  7782532 Pts
>> UVSUB1: GRDCRM: BAD CELL(      1) =    -0.207     0.104
>> UVSUB1: GRDCRM: BAD CELL(      2) =    -1.997   -10.820
>> UVSUB1: GRDCRM: BAD CELL(      3) =    -0.130    -7.831
>> UVSUB1: GRDCRM: BAD CELL(      4) =    42.734   -41.961
>> UVSUB1: GRDCRM: BAD CELL(      5) =    -0.223    -3.447
>> UVSUB1: GRDCRM: BAD CELL(      6) =    -3.663     0.588
>> -----------------------------------------------------------------------
>
> I do not know where you got your model which you are using
> for this UVSUB. The message means that the Clean
> Components are not exactly on cells - each of the two numbers
> listed should be integers.  A DFT method modeling should
> not care, but a gridded modeling requires components that
> are on integer cells for the present facet.
> Eric Greisen

Thanks.
I have an external program which conflates the standard AIPS
clean components together and stores them at their centroid.
I had thought this would be more accurate than just summing
up at the local peak. I will remedy this to output an integer.

Will CALIB also baulk at fractional pixel locations? It did not
output any error messages but ....

Thanks and regards

ramana athreya

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Ramana Athreya
National Centre for Radio Astrophysics (TIFR)
P. O. Bag 3, Pune University Campus,
Pune: 411 007. India.
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