Where uncertainty exists regarding district boundaries as indicated on the zoning map, the following rules shall apply:
a) STREET CENTERLINE - Where district boundaries approximately coincide with the centerline of streets, highways, railroad lines or streams, such centerline shall be construed to be the boundaries.
b) LOT LINE - Where district boundaries approximately coincide with lot lines, such lot lines shall be construed to be the boundaries; or where district boundaries are extensions of lot lines or connect the intersection of lot lines, such lines shall be the district boundaries.
c) PARALLEL TO FEATURES - Where district boundaries approximately parallel the centerline of streets and highways, such district boundaries shall be construed as parallel thereto, and at such distance there from, as indicated on the Zoning Map.
d) LOT DIVISION - Where district boundaries divide a lot, the location of such boundaries shall be determined by the use of the scale shown on the Zoning Map unless the boundaries are indicated by dimension.