so you collocate both datasets first to create a stack and then apply the valid pixel expression to the SAR bands as well.
i get this error
Do you save the new created bands as virtual bands?
I didn’t how can I do that please?
This can happen in SNAP 7 because of bug.
[SNAP-662] Collocation creates wrong valid pixel expressions in certain cases
This will be fixed with the next release (not far away).
In this post a work around is mentioned:
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Here is my post about applying cloud masks to Satellite Images.