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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.
Up to 1879 the 1:2500 maps were accompanied by Books of Reference or "area books" that gave acreages and land-use information for land-parcel numbers. After 1879, land-use information was dropped from these area books; after the mid-1880s, the books themselves were dropped and acreages were printed instead on the maps. [ 2 ]
The original draftsman's drawings for the area around St Columb Major in Cornwall, made in 1810. Detail from 1901 Ordnance Survey map of the Imperial fortress colony of Bermuda (showing St. George's Town and St. George's Garrison), compiled from surveys carried out between 1897 and 1899 by Lieutenant Arthur Johnson Savage, Royal Engineers.
The list of national coordinate reference systems (CRS) lists map projections officially recommended for existing countries. Given that every projection gives deformations, each country's needs are different in order to reduce these distortions.
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 project is sponsored by the Ordnance Survey, and extracts from the OS Landranger 1:50,000 scale maps illustrate the grid square pages. Geograph Project Limited is a charity registered in England and Wales, [ 5 ] and the name Geograph is trademarked.
Location Locality Coordinates (links to map & photo sources) OS grid reference; Yaddlethorpe: North Lincolnshire: Yafford: Isle of Wight: Yafforth: North Yorkshire
The work was halted by the outbreak of World War II in 1939, by which time the primary triangulation network covered all of England and Wales, but only as far as the Moray Firth in Scotland. Secondary triangulation had commenced in 1938, and after the end of the war, the retriangulation work was focused on secondary and lower-order survey work ...