No changes of any nature shall be made in the official Zoning Map or matter shown thereon except in conformity with the procedures set forth in this chapter. Any unauthorized change of whatever kind by any person shall be a violation of these provisions. The official Zoning Map shall be the final authority as to the current zoning status of land and water areas, buildings and other structures in the City. No amendment to this chapter, which involves matters on the official Zoning Map, shall become effective until after such change and entry has been made on the map.