Number of accepted visibilities

Got an image problem? Let us help!

Moderator: Mark.Wieringa

Number of accepted visibilities

Postby saracmbr » Tue Apr 30, 2013 12:06 pm

Hi there,

I wonder if I could change the number of accepted or rejected visibilities in invert but in 'MFS' mode. something similar to "slop" in cube imaging.

Cheers,
Sara
saracmbr
 
Posts: 38
Joined: Fri Jan 20, 2012 3:40 pm

Re: Number of accepted visibilities

Postby ste616 » Tue Apr 30, 2013 12:45 pm

Hi Sara,

Invert should be using every visibility it can to make an MFS image. Have you seen a problem where invert is not accepting as much data as you expect?
cheers
Jamie Stevens
ATCA Senior System Scientist
ste616
Site Admin
 
Posts: 211
Joined: Thu Feb 04, 2010 3:27 pm
Location: Paul Wild Observatory Narrabri NSW

Re: Number of accepted visibilities

Postby saracmbr » Tue Apr 30, 2013 1:07 pm

Hi Jamie,

This is what I get when I use invert:
Reading the visibility data ...
Making MFS images
Visibilities accepted: 38697615
### Warning: Visibilities rejected: 15025116

So It rejects 27% of the data.
saracmbr
 
Posts: 38
Joined: Fri Jan 20, 2012 3:40 pm

Re: Number of accepted visibilities

Postby ste616 » Tue Apr 30, 2013 1:40 pm

Hi Sara,

Assuming you're trying to make a 16cm image, it would not surprise me if 27% of the band was flagged.

You can check with the uvfstats task how much of your band has been flagged. I just confirmed with one of my datasets that invert is rejecting only the flagged visibilities, as expected.
cheers
Jamie Stevens
ATCA Senior System Scientist
ste616
Site Admin
 
Posts: 211
Joined: Thu Feb 04, 2010 3:27 pm
Location: Paul Wild Observatory Narrabri NSW


Return to Imaging

Who is online

Users browsing this forum: No registered users and 1 guest

cron