When uncertainty exists as to the boundaries of districts as shown on the Official Zoning Map, the following rules apply:
1. Boundaries indicated as approximately following the center lines of streets, highways, or alleys shall be construed to follow such center lines.
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 as following 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 center lines of streams, rivers, canals, lakes, or other bodies of water shall be construed to follow such center lines.
6. Boundaries indicated as parallel to or extension of features indicated in subsection (1) through (5) above shall be so construed. Distances not specifically indicated on the Official Zoning Map shall be determined by the scale of the map.