[daip] IMERG

[Eric Greisen]

Lynn D. Matthews wrote:
> I have a GBT map that I've created using SDGRD and would now like to 
> combine this with some VLA data. Is IMERG the appropriate task for this 
> purpose?
> 
> So far, I've been unable to obtain anything useful from IMERG (e.g., I get 
> something that looks similar to the original VLA map with some extra 
> noise/negative flux in the region of the GBT map). This after regridding 
> the GBT map to match the VLA pixel scale, adding the GBT beam size to the 
> header, and converting the units to Jy/beam. I have done no corrections to 
> the input (deconvolved) VLA map. Am I misunderstanding what the program 
> wants in terms of the input maps?
> 
> Incidentally, I have noticed a minor bug, in that messages report the 
> wrong INNAME for the "HI-RES MAP" (they instead report the INNAME of the 
> "LO-RES MAP").
>
There is a typo in the HI routine where it does a message about the 
files.  That is easily fixed - but I do not know this routine well.

Perhaps you could send me your images and inputs and I will play with it 
a bit to see if I can get anything useful.  I am not sold on this task 
although something like this clearly needs to be done to merge the 
images.  There have been bold claims about the equivalent task in aips++ 
- perhaps casa may have it.

Thanks,

Eric