This was posted on Facebook, with the person posting it saying that he got to work for Rockstars as a Cartographer.
On May 4th at 4:48PM, this was posted, with a quote saying "From my memory"
After 18 minutes, he posted the finished copy of the map with a quote saying "From my eyes"
Sorry if this thread is going to be locked xD
It's just kind of interesting.
I've also found these, I'm not sure if they're real or fake, but they fit the puzzle.
http://i.imgur.com/B37tl.jpg - Las Venturas
http://cache.kotaku....80aa3ff33fa.jpg - Los Santos