The baseline meets its corresponding principal meridian (north-south line) at the point of origin, or initial point, for the land survey. Searchable PDF prepared by the author, C. In the United States Public Land Survey System, a baseline is specifically the principal east-west line (i.e., a parallel) upon which all rectangular surveys in a defined area are based. History of the Rectangular Survey System Note: This is a large file, approximately 46MB.Department of the Interior, Bureau of Land Management Public Land Survey System (United States).It is therefore equivalent to the standard parallel in the US system. Each base line is about 24 miles apart, with the first base line at the 49th parallel, the Western US-Canadian border.
In Canadian land surveying, a base line is one of the many principal east-west lines that correspond to 4 tiers of townships (2 tiers north and 2 south). In Michigan, the baseline for the Michigan Survey forms the boundary between the second and third tiers of counties and in many portions, discontinuous segments of road along the baseline are known as "Baseline Road." Baseline Road in Hillsboro, Oregon, generally follows the Hillsboro CBL (Calibration Base Line). In Southern California, from Highland to San Dimas, the baseline is marked by Baseline Road. In Arizona, the baseline near the Phoenix metro area is marked by Baseline Road. In Colorado, Baseline Road in Boulder marks the 40th parallel, or the western extension of the Kansas-Nebraska boundary, which is also the boundary between Adams and Weld counties. follows the baseline used by surveyors of the Louisiana Purchase.
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