I thought the garbage patch is not visible to the naked eye, mostly made up of microscopic particles, and especially not to a satellite with a 3m resolution?
What's confusing? There's a picture taken every day.
If you're worried about the time span between the frames, I'm certain that shouldn't matter to the algorithm, it's just more noise and maybe the result takes longer to get..
> "fingernail-sized or smaller bits of plastic", often microscopic