The official zoning map shall be identified by the signature of the Mayor and attested by the Clerk under the following statement: “This is to certify that this is the official zoning map referred to Section 166.02 of the Zoning Code of Story City, Iowa.” The official zoning map shall be on file in the office of the Clerk and shall be the final authority as to the current zoning status of land, buildings and other structures in the City.