However... Regarding the OP, a Google Maps of Liberty City is really awesome though. Imagine if someone hacked the cellphone in the game to run off an Android emulator rendered to a screen overlay, and link it with the Google Navigator app (that's a significant modification to the engine though so I don't know if that would be possible, and especially not on multiplayer LOL).
That would be very cool!
I would have loved a map like this of GTA San Andreas.
Which means, they created a script that would walk around the world to specific set coordinates, take screenshots in all directions. Then when done, stitch the screenshots together to form the panorama pictures. Accordingly, this took 140 hours. I am assuming a lack of processing power was influenced by it.
Also, the thread reveals it was done in May 2011.
Also, what's wrong with doing it manually? That's how the real Google Street Views is generated.
There would be a lot more dead bodies.