Ordinance No. 2001-1564 of Webster City, Iowa, adopted June 4, 2001.” Regardless of the existence of purported copies of the official zoning map which may from time to time be made or published, the official zoning map which shall be located in the office of the zoning administrative officer is the final authority as to the current zoning status of land and water areas, buildings and other structures in the city. The official zoning map shall be amended in the manner set forth in section 50-23.