Koramsah,

30 meters or so is the typical accuracy for placement of DigitalGlobe images. This statement is based on a large collection of misalignment reports in THIS POSTING.

If you turn on the "Digital Globe coverage" layers and follow the links on their popup bubbles, you will see that the images are given with latitude and longitude to 5 decimal digits. That may or may not be the accuracy ot the data which is provided to Google by DG with such images.

I am not aware if the procedures and personnel staff for image placement have been described.