[daip] Pbcor

[Marina Kounkel]

The data were loaded with bdf2aips.

I'm really not seeing anything with gethead at all, neither in the console
nor in the message window. Puthead does appear work properly though, I
think.

Marina


On Thu, Jan 17, 2013 at 11:14 PM, Eric Greisen <egreisen at nrao.edu> wrote:

> On 1/17/2013 9:00 PM, Marina Kounkel wrote:
>
>> This is EVLA data observed July and August 2011 in three epochs.
>>
>> None of the keywords for GETHEAD that I tried return anything. Not even
>> something as simple as IMNAME, not to mention OBSRA or OBSDEC. This works
>> on neither the original UV file nor on IBM/ICL images.
>>
>> Interestingly enough, though, if I use IMHEADER in UV image, then there
>> is this:
>> RA           1    00 00 00.000 1.00       3600.000    0.00
>> DEC          1    00 00 00.000 1.00       3600.000    0.00
>>
>> Same thing in the quadrant produced by IMAGR lists actual ra and dec for
>> the central pixel of each quadrant.
>>
>> When these data were worked on this summer, there was no problem in this
>> regard, whether it was by default and something has changed since then, or
>> through some sort of command that was forgotten to be recorded.
>>
>>
> Did you load these data with BDF2AIPS or through the archive?
>
> I am suspecting that we now have a problem with the pointing position
> - my latest data came through BDF2AIPS and the new-format SU file lists 0.0
> for the pointing position.
>
> GETHEAD should work fine:
>    keyw='crval1'; geth;
> should show the RA in degrees at the reference pixel in KEYVAL.
>
> You can do PUTHEAD for OBSRA and OBSDEC (both in degrees).
>
> Multi-source UV data shows what you list above in the UV header since
> in fact multiple RAs and Decs are in the file.  Single-source UV data will
> have the correct RA and Dec in the header and should have the OBS position
> in the header too.  I think there is a bug for me to fix here - but you
> need
> to do the work-around of putting the obs position in each header.
>
> Eric Greisen
>
>
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