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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]
[2] [3] There are 332,216 such grid squares containing at least some land or permanent structure (at low tide), of which 281,131 have Geographs. [4] Geographs are being collected for all parts of Great Britain, Isle of Man and Ireland. The Channel Islands fall outside Britain's grid system, but may be geographed using their local UTM grid.
The metric national grid reference system was launched and a 1:25000-scale series of maps was introduced. The one-inch maps continued to be produced until the 1970s, when they were superseded by the 1:50000-scale series – as proposed by William Roy more than two centuries earlier.
The ODbL does not require any particular license for maps produced from ODbL data. Prior to 1 August 2020, map tiles produced by the OpenStreetMap Foundation were licensed under the CC-BY-SA-2.0 license. Maps produced by other people may be subject to other licences.
"Grid Locators and Grid Squares". ARRL. "An explanation of the [Maidenhead] system and how it came into being". jonit.com. From the field hunter's web page. "Map grid square". levinecentral.com. [Maidenhead] grid square for any location or amateur radio call sign "Generate a KML file that outlines a grid position". w8an.net. "Maidenhead locator".
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 ...
OS grid ref Country County BGS map sheet Book references Ben Blandy Shear Zone Scotland Trewin (ed) 2002 [1] Berdale-Grocken Shear Zone Scotland Shetland Sc 129 [2] Berw Shear Zone Wales UK (south):625K [3] Brenchley & Rawson 2006 Canisp Shear Belt Scotland BGS:BRG2 [4] Canisp Shear Zone Scotland Sutherland Assynt (Special 50K) [5] Sc 101E, Sc 107W