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Mosaic tile edges

PostPosted: Wed Mar 16, 2016 4:09 am
by Kingsley
Hi,
Is there any way to suppress the square tile edges when mosaicking? I thought maybe it was a weighting issue but can't seem to figure it out
I'm just re-manufacturing the old 1992 HI cube

Thanks for your help.
K

Re: Mosaic tile edges

PostPosted: Wed Mar 16, 2016 9:12 am
by ste616
Hi Kingsley,

Can you please provide us an example of what you mean by "square tile edges"? I am afraid I don't know what you're referring to.

Re: Mosaic tile edges

PostPosted: Wed Mar 16, 2016 9:44 am
by Mark.Wieringa
Hi,

Not sure I understand exactly what you are referring too. Maybe you can show a picture?
If you are seeing square tile edges in the middle of your mosaic you probably need to increase your image size - it means the primary beam response hasn't gone down far enough yet at the edge of the individual images.
Square edges at the outer boundary of the mosaic are normal.

Cheers,

Mark

Re: Mosaic tile edges

PostPosted: Wed Mar 16, 2016 9:53 pm
by Kingsley
Thanks, It could be that Mark, It's in the middle, and looks like a jigsaw puzzle type thing.. I've attached a bit of the image as I don't think I'm doing a great describing job!

Re: Mosaic tile edges

PostPosted: Thu Mar 17, 2016 2:59 am
by Kingsley
Aha! changing the image size does indeed appear to have fixed it! would there be an ideal value, I put it at 4,4, beam just to quickly see what it did

Re: Mosaic tile edges

PostPosted: Thu Mar 17, 2016 8:40 am
by Mark.Wieringa
Hi,

normally imsize=2,2,beam would be sufficient, but if your mosaic is sparse (below Nyquist sampling) you may need to increase this a bit.

Cheers,

Mark