"Possibly I misunderstood something, when you said the spell only viewed immediate surroundings.  If somebody was standing on a hill somewhere, could you look through the scry out to the horizon?  And if not, the obvious solution that comes to mind is for a cooperative target to carry a mirror, that can reflect the more distant surroundings."

"Possibly I misunderstood something, when you said the spell only viewed immediate surroundings, if the view-from-the-air trick works.  If somebody was standing on a hill somewhere, could you look through the scry out to the horizon?  And if not, the obvious solution that comes to mind is for a cooperative target to carry a mirror, that can reflect the more distant surroundings."