(a)   Where district boundaries are so indicated as approximately following the centerlines of streets, or street right-of-way lines, such centerlines, street lines, or right-of-way lines shall be construed to be said boundaries.

   (b)   Where district boundaries are so indicated that they approximately follow the lot lines, such lot lines shall be construed to be said boundaries.

   (c)   Where district boundaries are so indicated that they are approximately parallel to the centerlines or street lines of streets, or the centerlines or right-of-way lines, such district boundaries shall be construed as being parallel thereto and at such distance therefrom as indicated on the official Zoning Map. If no distance is given, such dimensions shall be determined by the use of the scale shown on the official Zoning Map.

   (d)   Where the boundary of a district follows a railroad line, such boundary shall be deemed to be located in the middle of the main tracks of said railroad line.

   (e)   Where the boundary of a district follows a stream, lake, or other body of water, said boundary line shall be deemed to be at the limit of the jurisdiction of the Municipality unless otherwise indicated.

   (f)   Where district boundaries are so indicated that they follow or approximately follow the limits of any municipal corporation, such boundaries shall be construed as following such limits.

   (g)   Whenever any street, alley, or other public way is vacated by official Council action, the zoning district adjoining each side of such street, alley, or public way shall automatically be extended to the center of such vacation, and all areas within that vacation shall thenceforth be subject to all regulations appropriate to the respective extended districts.