The boundaries of said districts are hereby established as shown on the map which accompanies the chapter and is made a part hereof. The map is hereby designated as the "Official Zoning Map of the Incorporated Village of Plandome Manor, situated in Nassau County, New York." The boundaries between districts are, unless otherwise indicated, either the center lines of streets, alleys, waterways, rights-of-way, or such lines extended. Where such boundary lines are indicated as approximately following property lines or parks or other publicly owned lands, such lines shall be construed to be such boundaries.