The location and boundaries of districts are and shall be shown on a map entitled "Ordinance No. 2015-2, Zoning Map, Pemberton Borough, Burlington County New Jersey," February 2015, on file in the office of the Borough Clerk of said Borough; provided, however, that where the designation on said Zoning Map indicates a district boundary approximately on a street or alley line or on a lot line, the center line of such street or alley or such lot line shall be construed to be the boundary.