[daip] Image size (fwd)

[Rob Ivison]

>> hi Eric et al.
>> 
>> is the image size limit an insurmountable problem in RMSD, or could the 
>> code be altered to take us marginally above 10kx10k? (see message from my 
>> student, below).
>> 
>> cheers,
>> 
>> 
>> Rob
>> 
>> ---------- Forwarded message ----------
>> Date: Thu, 29 Oct 2009 22:32:46 +0000 (GMT)
>> From: Vinodiran Arumugam <va at roe.ac.uk>
>> To: Rob Ivison <rji at roe.ac.uk>
>> Subject: Image size
>> 
>> Hi Rob,
>> 
>> It was indeed the image size that was affecting the way in which RMSD 
>> produced an output. Don't seem to be able to go above 9500 (9600 onwards) 
>> as this seems to be the maximum that rmsd can handle without producing an 
>> incomplete noise map. I'm using the 9500 image to make the choice between 
>> pbparm=0.3, 0.1 and 0.5 images. If we can use the bigger images later, this 
>> choioce should still be valid right (despite using a smaller image)?
>> 
> I have looked at the code and it certainly attempts to work on an image 32768 
> in the X direction with even less limitation in the Y direction. The size of 
> the area over which the central rms is computed is limited to 1024 times 1024 
> pixels.  Since AIPS cannot handle images > 32K anywhere and the 1024^2 box 
> would be very expensive to run, these limits seem reasonable.  I will attempt 
> to test this to see if there is something ion the code stoping it from doing 
> what its outer intenstions indicate.  Is the student attempting some very 
> large box?

just 71^2 i believe.

R