When we edit a Zone, on the Haze Altitude base and ceiling, the UI seem to not accept values outside -5000 to 5000.
Since we can build a zone everywhere, we need this to allow at least -16000 to 16000 to cover all the domain.
But I would add a larger interval than that to keep a flexibility. (we need to set larger for some effect)
Why not simply use the natural limit of the datatype.