[daip] Re: wide field imaging.

[Eric Greisen]

Ian Pattison writes:

 > I am attending the summer school next week, so I guess I could get some answers 
 > then, but I need to keep moving on with my PhD!

     I have been on vacation - use daip to get a reply from others in
the much-reduced group.

 > 
 > I have a single field (VLA-A config, 5 GHz, 4 IF mode) which i want to image out 
 > to the field of view (~ 9 arc-mins). The time on source was 2 hours. I wish to 
 > locate all sources of emission over 3*sigma, and obtain contour plots for all 
 > sources. My worry is that non-coplanarity might affect the appearance of sources 
 > far from the field centre (~ 4-5 arcmins). Is this going to be a problem, and if 
 > so should i employ the polyhedron imaging task in AIPS? Alternatively, what 
 > would be a 'safe' radius from the field centre to image over (i.e. within which, 
 > one can safely ignore non-coplanarity)
 > 
 > Thanks for your help. See you next week hopefully.

I would use SETFC with CELLSIZE and IMSIZE set to zero.  That will
tell you what it recommends.  Note - I will show you why you may need
to image out very much further than the primary beam when you get
here.

Eric Greisen