From time to time, the county assessor shall, by personal inspection and examination of persons, property, or records, gather and record in writing any and all available data and information bearing upon the location, number, amount, kind, and value of any and all property and persons which he or she is by law required to assess. This data and information shall be and remain permanently a part of the records of the county assessor's office and shall be filed in such manner as may be readily referred to and utilized by the county equalization board, county clerk, county court, or other interested parties.