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The British Geological Survey was founded in 1835 as the Ordnance Geological Survey under Henry De la Beche, and remained a branch of the Ordnance Survey until 1965. At the same time, the uneven quality of the English and Scottish maps was being improved by engravers under Benjamin Baker .
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.
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 .
The 1:50,000 sheets originate from earlier 'one inch to the mile' (1:63,360) coverage utilising the pre-grid Ordnance Survey One Inch Third Edition as the base map. Current sheets are a mixture of modern field mapping at 1:10,000 redrawn at the 1:50,000 scale and older 1:63,360 maps reproduced on a modern base map at 1:50,000.
The dataset was created in 1985 by Jean-Patrick Girbig of Elf, to "standardize, improve and share spatial data between members of the European Petroleum Survey Group". [5] It was made public in 1993. [6] In 2005, the EPSG organisation was merged into International Association of Oil & Gas Producers (IOGP), and became the Geomatics Committee ...
In keeping with other OS open data initiatives, [2] Ordnance Survey has a policy on royalty-free use of the TOID [3] with the aim of allowing easier integration of data using its spatial database: a core part of its vision of a Digital National Framework.
Any vertical datum used by the British Ordnance Survey as the basis for reporting elevations on maps. In modern Great Britain, the standard ordnance datum is the ODN, defined as the mean sea level calculated from hourly observations of the tidal gauge at Newlyn, Cornwall, between 1915 and 1921.
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 ...