Firstmrmax:
I guess I'm relatively new here, and surely many other people would like this too, there fore this must have been asked many times before.
Yes, many many many times. Using the forum search feature would have given you all the information you sought.
Here's your answer -
Blitz courses need relatively few photographs from each hole to make.
Full courses need 200,000+ photographs to make.
Pebble Beach is the only blitz course that wgt have returned to and re-photographed to make the full course available.
WGT have a deal which lets them add the US Open course each year, this years was at Oakmont, which is already in the game, so we got Pebble Beach instead.