Boundaries of the districts as enumerated in Section II of this ordinance are hereby established as shown on the maps on file in the office of the City Clerk, which maps are hereby designed [designated] as the “zoning district maps,” and said maps and all notations, references, and information shown thereon are made as much a part of this ordinance as if the same were set forth in full herein, and said maps shall be updated within a reasonable time to conform to this ordinance upon adoption. It shall be the duty of the City Clerk to keep on file at City Hall authentic copies of said maps and all changes, amendments or additions thereto.

When definite distances in feet are not shown on the zoning district maps, the district boundaries are intended to be along existing street, alley or platted lot lines or extensions of the same; and if the exact location of such lines is not clear, it shall be determined by the planning and zoning board, due consideration being given to location, as indicated by the scale of the zoning district maps.

When streets or alleys on the ground differ from the streets or alleys as shown on the zoning district maps, the planning and zoning board may apply the district designations on the maps to the street or alley on the ground in such manner as to conform to the intent and purpose of this ordinance.

Whenever any street or alley is vacated, the particular district to which such street or alley is adjacent shall automatically be extended to the centerline of any such street or alley.