Zone boundary lines are intended to follow the center line of the streets, railroad rights-of-way, electric transmission line rights-of-way, watercourses and lot or property lines as they exist on the plats of record at the time of the passage of this chapter, unless such zone boundary lines are fixed by dimensions shown on the official zoning map or by metes and bounds description as contained in this chapter.

Where such boundaries are not fixed by dimensions and where they approximately follow lot lines and where they do not scale more than 25 feet distant therefrom, such lot lines shall be construed to be such boundaries unless specifically shown otherwise.

In unsubdivided lands and where a zone boundary divides a lot, the location of such boundary, unless the same is indicated by dimensions shown on the map, shall be determined by the use of the scale appearing thereon.

The Board of Adjustment shall have the power to fix the true location of any zone boundary in cases of uncertainty or dispute.