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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.
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.
Initial point: The starting point for a survey; the intersection point of the Principal meridian and the Base line in a given region. Land grant : Historically a land grant is an area of land to which title was conferred by a predecessor government, usually English/British, Spanish or Mexican, and confirmed by the U.S federal courts after the ...
List of principal and guide meridians and base lines of the United States; 0–9. First principal meridian; Second principal meridian; Third principal meridian;
The Fifth Principal Meridian, also known as the "5th Principal Meridian" and "PM 05", is a principal meridian survey line used in the United States for land claims in the Public Land Survey System (PLSS). It was first surveyed in 1815. The meridian, a north-south line, starts from the old mouth of the Arkansas River and runs north.
The townships are referenced by a numbering system that locates the township in relation to a principal meridian (north-south) and a base line (east-west). For example, Township 2 North, Range 4 East is the 4th township east of the principal meridian and the 2nd township north of the base line.
U.S. Bureau of Land Management map showing the principal meridians of Louisiana, Mississippi, and Alabama. The Louisiana meridian, in longitude 92° 24′ 15″ west of Greenwich, extends from the Gulf of Mexico to the north boundary of Louisiana, and with the baseline through the initial point conforming to the parallel of 31° north latitude, governs all the surveys in the state west of the ...
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. The baseline meets its corresponding principal meridian (north-south line) at the point of origin, or initial point, for the land survey.