It works the same way as the rest of Google, using bots to collect info. You'll find those images won't get updated for a while.
The bots are probably starting to send new ones across, but I can expect it'll take a while.
The whole thing seems to work in squares you see.
But yeah, if it was live, that'd be great. Though it'd be pretty impossible. A satillight, or even a bunch can't see the whole world at once.
Even if that was possible, you think it'd be able to stream all that data onto Google?...No way