In cases where the exact location of a district boundary is unclear as shown on the official zoning map, the following rules shall be used in determining the location of said district boundary:

   1.   Boundaries indicated as approximately following the centerlines of streets, highways, or alleys shall be construed to follow such centerlines.

   2.   Boundaries indicated as approximately following platted lot lines shall be construed as following such lot lines.

   3.   Boundaries indicated as approximately following City limits shall be construed as following City limits.

   4.   Boundaries indicated as following railroad lines shall be construed to be midway between the main tracks.

   5.   Boundaries indicated as following shore lines shall be construed to follow such shore lines, and in the event of change in the shore line shall be construed as moving with the actual shore line; boundaries indicated as approximately following the centerlines of streams, rivers, canals, lakes, or other bodies of water shall be construed to follow such centerlines.

   6.   Boundaries indicated as parallel to or extensions of features indicated in subsections 1 through 5 shall be so construed. Distances not specifically indicated on the official zoning map shall be determined by the scale of the map.

   7.   Where physical or cultural features existing on the ground are at variance with those shown on the official zoning map, or in other circumstances not covered by subsections 1 through 5 above, the Board of Adjustment shall interpret the district boundaries.

   8.   Wherever any street, alley, or other public way is vacated in the manner authorized by law, the zoning district adjoining each side of such street, alley, or public way shall be automatically extended to the center of such vacation and all area included in the vacation shall then and thenceforth be subject to all regulations to the extended districts.