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Pollokshaws on Roy 's Military Survey of Scotland (1747–1755) [1] The Ordnance Survey (OS) is the national mapping agency for Great Britain. [2] The agency's name indicates its original military purpose (see ordnance and surveying), which was to map Scotland in the wake of the Jacobite rising of 1745.
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.
View from Newlyn harbour showing the lighthouse and Newlyn Tidal Observatory to its right, both painted red and white. 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 ...
The OS MasterMap is the premier digital product of the Ordnance Survey. 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. Every feature is given a unique TOID (TO pographical ID entifier), a simple identifier that includes no semantic ...
Public bridleways are shown on Ordnance Survey 1:25,000 and 1:50,000 maps, but many public bridleways (as well as "roads used as public paths", "byways open to all traffic" and "restricted byways") were recorded as footpaths only, as a result of the burden of maintenance required by the National Parks and Access to the Countryside Act 1949, and ...
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. [3]
The Ordnance Survey began producing six inch to the mile (1:10,560) maps of Great Britain in the 1840s, modelled on its first large-scale maps of Ireland from the mid-1830s. This was partly in response to the Tithe Commutation Act 1836 which led to calls for a large-scale survey of England and Wales.
Also curvimeter, meilograph, or map measurer. An instrument used to measure the lengths of arbitrary curved lines, especially the distances of rivers and roads on a map. ordinal directions See intercardinal directions. ordnance datum (OD) Any vertical datum used by the British Ordnance Survey as the basis for reporting elevations on maps.