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In surveying, a baseline is generally a line between two points on the Earth's surface and the direction and/or distance between them. In a triangulation network, at least one distance between two stations needs to be measured to calculate the size of the triangles by trigonometry.
Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS.. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
The surveying of any regional area, such as a state or multiple states, is a multi-step process. First, two controlling survey lines are established: a baseline which runs east–west and a principal meridian which runs north–south.
In the United States Public Land Survey System, a principal meridian is the principal north–south line used for survey control in a large region, and which divides townships between east and west. The meridian meets its corresponding baseline at the point of origin, or initial point, for the land survey.
Surveying or land surveying is the technique, profession, art, ... and mark out a baseline between them. At regular intervals, a distance was measured at right angles ...
A U.S. Bureau of Land Management map showing all of the principal meridians and baselines in the U.S. Public Land Survey System. In surveying, an initial point is a datum (a specific point on the surface of the earth) that marks the beginning point for a cadastral survey.
U.S. Bureau of Land Management map showing the principal meridians of Ohio, Indiana, and Illinois. The fourth principal meridian, set in 1815, [1] is the principal meridian for land surveys in northwestern Illinois and west-central Illinois, [2] and its 1831 [3] extension is the principal meridian for land surveys in Wisconsin and northeastern Minnesota.
Baseline (surveying), a line between two points of the Earth's surface and the direction and distance between them; Baseline (typography), the line upon which most letters "sit" and below which descenders extend; Baseline (budgeting), an estimate of budget expected during a fiscal year; Baseline (science), information found at the beginning of ...