I think the former Walker Air Force facility is now used either for mothball storage or maintenance of aircraft -- many can be seen on the tarmac. Then going north, the resolution goes to hell at roughly the city limits. I don't think security concerns would explain it but who knows?
Could be it'll improve before long. I'm going to try to e-mail google about it. I just hope they don't send reps to my door asking my assistance in making their product better.