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The Ordnance Survey National Grid reference system (OSGB), also known as British National Grid (BNG), [1] [2] is a system of geographic grid references, distinct from latitude and longitude, whereby any location in Great Britain can be described in terms of its distance from the origin (0, 0), which lies to the west of the Isles of Scilly.
The United States National Grid (USNG) is a multi-purpose location system of grid references used in the United States. It provides a nationally consistent "language of location", optimized for local applications, in a compact, user friendly format. It is similar in design to the national grid reference systems used in other
The Ordnance Survey maps of Great Britain use the Ordnance Survey National Grid The Ordnance Survey's original maps were made by triangulation . For the second survey, in 1934, this process was used again and resulted in the building of many triangulation pillars ( trig points ): short (c. 4 feet/1.2 m high), usually square, concrete or stone ...
A typical map with grid lines. The Ordnance Survey National Grid (United Kingdom) and other national grid systems use similar approaches. In Ordnance Survey maps, each Easting and Northing grid line is given a two-digit code, based on the British national grid reference system with an origin point just off the southwest coast of the United ...
The national grid referencing system was devised by the Ordnance Survey, and is heavily used in their survey data, and in maps (whether published by the Ordnance Survey of Ireland, the Ordnance Survey of Northern Ireland or commercial map producers) based on those surveys. Additionally grid references are commonly quoted in other publications ...
The work was designed to form a complete new survey control network for the whole country, and to unify the mapping of the United Kingdom from local county projections into a single national datum projection and reference system. Its completion led to the establishment of the OSGB36 datum and Ordnance Survey National Grid in use today.
Given that every projection gives deformations, each country's needs are different in order to reduce these distortions. These national projections, or national Coordinate Reference Systems are officially announced by the relevant national agencies. The list below is a collection of available official national projected Coordinate Reference ...
B Grid reference is based on the British national grid reference system, also known as OSGB36, and is the system used by the Ordnance Survey. [5] C Link to maps using the Nature on the Map service provided by English Nature. D English Nature citation sheets for each SSSI. Retrieved 8 May 2011.