A PLSS, Public Land Survey System, map is a type of systematic land partitioning system, or cadastral map, that shows land ownership. These maps use the State Plane Coordinate system and contain a base line, principal meridian, and initial point. The base line is the east-west line, the principal meridian is the north-south line, and the initial point provides the basis of this grid pattern. It is organized additionally into townships, which are horizontal lines at 6-mile intervals that parallel the base line. The vertical lines at 6-mile intervals are called ranges and parallel the principal meridian. The above map is a PLSS map of Legend Lake in Wisconsin, and qualifies as a PLSS because the region is broken up in townships and ranges.
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