For the purposes of sections 67.870 to 67.910, an “open space” or “open area” means any space or area the preservation or restriction of the use of which would:

(1) Maintain or enhance the conservation of natural or scenic resources,

(2) Protect natural streams or water supply,

(3) Promote conservation of soils, wet lands, beaches or marshes,

(4) Enhance the value to the public of abutting or neighboring parks, forests, wildlife preserves, nature reservations or sanctuaries, or other open areas and open spaces,

(5) Preserve archaeologic and historic sites,

(6) Implement the plan of development adopted by the planning agency of the state or county or municipality, or

(7) Promote orderly urban or suburban development.