It is the intent of the City of Lander that these regulations, which include this ordinance and the District Zoning Map, have been established for the purpose of promoting sound and desirable development and for maintaining stable land use patterns. In harmony with this purpose, the ordinance and map shall not be amended except to (1) correct an obvious error or oversight in the regulations, or (2) to recognize the promotion of the public health, safety and general welfare. In conformity with this statement of policy, the City Council and the City of Lander may initiate amendments, or any person, firm or corporation may initiate amendments in the manner hereinafter set forth.