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The Ordnance Survey still maintains a set of master geodetic reference points to tie Ordnance Survey geographic datum points to modern measurement systems such as GPS. Ordnance Survey maps of Great Britain use the Ordnance Survey National Grid rather than latitude and longitude to indicate position.
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.
Here, we are plotting the reference 696018. The marks corresponding to (6, 8) on the Romer are lined up along the gridlines (69, 01). The hole near the corner yields the exact point, the church at Little Plumpton. A reference card or Romer [1] is a device for increasing the accuracy when reading a grid reference from a map.
The OS MasterMap is the premier digital product of the Ordnance Survey. It was launched in November 2001. It was launched in November 2001. It is a database that records every fixed feature of Great Britain larger than a few meters in one continuous digital map .
An ordnance datum (OD) is a vertical datum used by an ordnance survey as the basis for deriving altitudes on maps. A spot height may be expressed as above ordnance datum ( AOD ). Usually mean sea level (MSL) at a particular place is used for the datum.
Ordnance Survey Great Britain 1936: SK-42: Systema Koordinat 1942 goda: ED50: European Datum 1950: SAD69: South American Datum 1969: GRS 80: Geodetic Reference System 1980: ISO 6709: Geographic point coord. 1983: NAD 83: North American Datum 1983: WGS 84: World Geodetic System 1984: NAVD 88: N. American Vertical Datum 1988: ETRS89: European ...
The Unique Property Reference Number (UPRN) is a unique number (a geocode) for every addressable location—e.g., a building, a bus stop, a post box, a feature in the landscape, or a defibrillator—in Great Britain. [1] Over 42 million locations have UPRNs, which can be found in Ordnance Survey's AddressBase databases. [1]
{{Ordnance Survey coordinates|cc|tt}} Where: cc is the grid reference in one of the formats listed below followed, optionally, by any additional parameters. For example: TQ123456_region:GB_scale:25000; tt is the text to appear in the link. Grid reference formats - letters are not case-sensitive: