S.D. Codified Laws § 10-3-29
The director of equalization shall prepare a large scale topographical land map of the county showing the location of all railroads, highways, roads, bridges, rivers, lakes, swamp areas, wooded tracts, stony ridges, and other features that might affect the value of the land and appropriate symbols to indicate the best, the fair, and the poor land of the county. The director shall prepare and keep available in the director's office tables showing the classification of cultivated, meadow, pasture, cut-over timber, and wastelands of each congressional and organized township, for use in connection with the map. The director shall keep the map and tables available in the office for the director's use and for the guidance of local and county boards of equalization.
SDCL 10-3-29