Any function that may be exercised under this Act with respect to land may be restricted to--
(a) land down to a specified depth below the surface of the land, or
(b) airspace up to a specified height above the surface of the land, or
(c) land lying between specified depths below the surface of the land, or
(d) airspace between specified heights above the surface of the land, or
(e) land and airspace between a specified depth below, and a specified height above, the surface of the land.