Download only some channels of Sentinel-1 produts

[loreabad6]

With sentinelsat it is possible to apply a filter to get specific sub-swaths. We think then that with this filter we can get only VV polarisation and download less unnecessary data.

Some open questions for the project porpuses before implementing this:

• Do we only use IW - Interferometric Wide Swath, or also EW - Extra-Wide Swath?
• Do we only use VV or HH, or do we also want to use HV or VH?

@ZahraDabiri do you have any ideas or insights on what you would like to test?

[ZahraDabiri]

Hi Lore, It is perfect for filtering data at the beginning.

• At the moment, we only use the IW-interferometric Wide Swath. So, please continue with filtering the products for IW. It also makes sense to get just one polarization; in this case, "VV" polarisation is sufficient.

Two more filtering suggestions:

If possible, with your code, you can also limit the search to seasonal search (for example, to get rid of snowy months).

• Specify the granular (path) to search for data.

One question: Do you want to download all data and then search for a perpendicular baseline?

[loreabad6]

Hi Ani!

It is perfect for filtering data at the beginning.

Perfect! That sounds like a good plan.

If possible, with your code, you can also limit the search to seasonal search (for example, to get rid of snowy months).

It is indeed an argument now to be put in manually (summer months per year) but let's keep it in mind to automate it!

Specify the granular (path) to search for data

I don't find any of these in the metadata, do you know what it is called there? We filter by an AOI, so everything that intersects with the AOI is part of the query result, would this be sufficient?

One question: Do you want to download all data and then search for a perpendicular baseline?

This is what we are currently doing since we don't find a way to do it in an automated way without downloading the data. We manage to filter out a bit the temporal baseline by taking the images that are in the same relative older and pass within 6 days, but the perpendicular baseline is computed in snappy and apparentely needs the whole file to compute. If you know how to do it without downloading the scenes it would be great to do that!

[loreabad6]

The querying and download scripts now work in a way that only matching scenes with the AOI and timeframes, and also perpendicular and temporal baseline thresholds are taken into account. Downloading partial scenes was not implemented yet to have the option to also use other polarisations for example for testing what could improve results.