Planetary shields are a common part of Star Wars lore. However, in most cases, they appear to be something that is raised and lowered in their entirety.
In Rogue One we see a shield which does not have this limitation. It shields the whole planet continuously except for a small gate which can be opened.
This seems like a good idea but I don't recall hearing about such a device in any of the old Legends or new canon books that I have read. Is this a new feature for the Star Wars universe?
If it is new to Star Wars, we are left with the thought that it was inspired by the air gate from Spaceballs(!)
Has this ever been admitted to?