I fish the early seasons up here and know that the weeds die off each season.
I'm not sure how you could keep track of weed growth from satellite photos and
turn that into some sort of opportunistic fishing situation. I guess Stony has
the smarts to do it.
I have one (of a dozen) satellite map that shows off the Great Lakes and also
some of the smaller lakes. The maps are quite inspirational to look at from a
fishing perspective. There is 400,000 lakes in Ontario.