Number of accepted visibilities

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

Number of accepted visibilities

Post by saracmbr »

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
ste616
Site Admin
Posts: 220
Joined: Thu Feb 04, 2010 3:27 pm
Location: Paul Wild Observatory Narrabri NSW

Re: Number of accepted visibilities

Post by ste616 »

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

Re: Number of accepted visibilities

Post by saracmbr »

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.
ste616
Site Admin
Posts: 220
Joined: Thu Feb 04, 2010 3:27 pm
Location: Paul Wild Observatory Narrabri NSW

Re: Number of accepted visibilities

Post by ste616 »

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
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