The quadrangles are divided into townships that are 6 miles square. Rectangular system of public surveying.Ĭonsider only the 24-mile rectangular surveys. A spacing of 24 miles became the later standard. A few of the original PLSS surveys laid out the lines 30 miles apart. In general, the system establishes a grid by dividing the land by north and south line that follows a true meridian, with a base line that follows a latitude, see Figure 14.1.Īdditional lines parallel to the base line, called standard parallels and lines perpendicular to the base lines, called guide meridians, are added to form quadrangles 24 miles square. The system was adopted in 1785 by the Continental Congress to subdivide new lands northwest of the Ohio River in a logical and systematic manner. The PLSS or rectangular system of public land survey is used in 30 states.
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