The department of natural resources shall establish and maintain a state base mapping system. The standards for the state base mapping system shall be:

(1) A series of fifteen minute United States geological survey quadrangle map separates at a scale of one to 48,000 (one inch equals 4,000 feet) covering the entire state;

(2) A series of seven and one-half minute United States geological survey quadrangle map separates at a scale of one to 24,000 (one inch equals 2,000 feet) for urban areas; including but not limited to those identified as urban by the state department of transportation for the United States department of transportation.

All features and symbols added to the quadrangle separates shall meet as nearly as is practical national map accuracy standards and specifications as defined by the United States geological survey for their fifteen minute and seven and one-half minute quadrangle map separates.

Each quadrangle shall be revised by the department of natural resources as necessary to reflect current conditions.