![]() Many prominent Ontario baselines lie on the surveyed boundaries of land treaties signed with First Nations peoples. The result of this surveying is the concession road and sideline system in use today. In Ontario, a baseline forms a straight line parallel a geographical feature (mostly a lake, especially Lake Ontario or Lake Erie) that serves as a reference line for surveying a grid of property lots. It is, therefore equivalent to the standard parallel in the US system. The base lines are about 24 miles (39 km) apart, with the first base line at the 49th parallel, the western Canada–US border. In Canadian land surveying, a base line is one of the many principal east-west lines that correspond to four tiers of townships (two tiers north and two south). Baseline Road in Hillsboro, Oregon, generally follows the Willamette Baseline which intersects the Willamette Meridian at the Willamette Stone State Park.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." 8 Mile Road in the Detroit area runs along the Michigan Baseline and was formerly known as "Baseline Road.".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.In Little Rock, Arkansas, Baseline Road follows the baseline used by surveyors of the Louisiana Purchase.Many communities in the United States have roads that run along survey baselines, many of which are named to reflect that fact. More specifically a baseline may be the line that divides a survey township between north and south. For example, the baseline for Nebraska and Kansas is shared as the border for both states, at the 40th parallel north. The baseline meets its corresponding principal meridian (north-south line) at the point of origin, or initial point, for the land survey. 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. In a triangulation network, at least one baseline between two stations needs to be measured to calculate the size of the triangles by trigonometry. In surveying, a baseline is generally a line between two points on the earth's surface and the direction and distance between them. This BLM map depicts the principal meridians and baselines used in the survey of the United States. ( June 2010) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations.
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