S1-interferometry Using subswath from different scenes for

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Hi,
I am lucky (or not) to have a ROI that gets imaged on 2 paths to look at a time series analysis of the deformation
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I would love to be able to use both paths but is it recommended? The interest is that it is covered more often indeed.
Also maybe a trivial question but I consequently have 2 sets of scenes where I need to split the TOPS. How can I identify which needs to keep only IW3 and which needs to keep IW1. Do I need to download the metadata and make the intersection with the ROI or can I identify the specific path from the file name for example?
Thanks

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I got a partial answer as I cannot coregister the 2 so I need to process by tracks I suppose. The Backgeocoding expects the same swath.

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InSAR requires the same track to work. You might have InSAR observations from multiple tracks depending on where your test-site is.

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Thanks, I will do a processing for each track and compare both.