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Hectad
A hectad is an area 10 km x 10 km square. The term has a particular use in connection with the British Ordnance Survey national grid, and then refers to any of the 100 such squares which make up a standard 100 km x 100 km myriad; these are denoted using the letter code of the 100 km square, and then a two-digit number consisting of the one-digit easting of the western bound of the hectad and the one-digit northing of its southern bound. See also * Tetrad (unit of area) A tetrad is an area 2 km x 2 km square. The term refers to any of the 25 such squares which make up a standard hectad. Tetrads are sometimes used by biologists for reporting the distribution of species to maintain a degree of confidentia ... Units of area {{measurement-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrad (unit Of Area)
A tetrad is an area 2 km x 2 km square. The term refers to any of the 25 such squares which make up a standard hectad A hectad is an area 10 km x 10 km square. The term has a particular use in connection with the British Ordnance Survey national grid, and then refers to any of the 100 such squares which make up a standard 100 km x 100 km myr .... Tetrads are sometimes used by biologists for reporting the distribution of species to maintain a degree of confidentiality about their data, though the system is not in universal use. The tetrads are labelled from ''A'' to ''Z'' (omitting ''O'') according to the "DINTY" system as shown in the grid below, which takes its name from the letters of the second line. References Units of area {{measurement-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myriad (unit Of Area) , where the grids are divided into 100 km × 100 km squares, each with a two letter prefix. For example, in an OS grid reference the prefix TL refers to the myriad 500 km east and 200 km north of the grid origin.
A myriad contains 100 hectads.
A myriad is an area 100 km × 100 km square i.e. it is 10,000 (one myriad) km2. 100 of these squares would be one million km2. The term has a particular use in connection with the British Ordnance Survey National Grid and the US Military Grid Reference System The Military Grid Reference System (MGRS) Datums, Ellipsoids, Grids, and Grid Reference Sys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordnance Survey
, nativename_a = , nativename_r = , logo = Ordnance Survey 2015 Logo.svg , logo_width = 240px , logo_caption = , seal = , seal_width = , seal_caption = , picture = , picture_width = , picture_caption = , formed = , preceding1 = , dissolved = , superseding = , jurisdiction = Great BritainThe Ordnance Survey deals only with maps of Great Britain, and, to an extent, the Isle of Man, but not Northern Ireland, which has its own, separate government agency, the Ordnance Survey of Northern Ireland. , headquarters = Southampton, England, UK , region_code = GB , coordinates = , employees = 1,244 , budget = , minister1_name = , minister1_pfo = , chief1_name = Steve Blair , chief1_position = CEO , agency_type = , parent_agency = , child1_agency = , keydocument1 = , website = , footnotes = , map = , map_width = , map_caption = Ordnance Survey (OS) is the national mapping agency for Great Britain. The agency's name indicates its original military purpose (se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British National Grid Reference System
The Ordnance Survey National Grid reference system (OSGB) (also known as British National Grid (BNG)) is a system of geographic grid references used in Great Britain, distinct from latitude and longitude. The Ordnance Survey (OS) devised the national grid reference system, and it is heavily used in their survey data, and in maps based on those surveys, whether published by the Ordnance Survey or by commercial map producers. Grid references are also commonly quoted in other publications and data sources, such as guide books and government planning documents. A number of different systems exist that can provide grid references for locations within the British Isles: this article describes the system created solely for Great Britain and its outlying islands (including the Isle of Man); the Irish grid reference system was a similar system created by the Ordnance Survey of Ireland and the Ordnance Survey of Northern Ireland for the island of Ireland. The Universal Transverse Merca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Easting
A projected coordinate system, also known as a projected coordinate reference system, a planar coordinate system, or grid reference system, is a type of spatial reference system that represents locations on the Earth using cartesian coordinates (''x'',''y'') on a planar surface created by a particular map projection. Each projected coordinate system, such as "Universal Transverse Mercator WGS 84 Zone 26N," is defined by a choice of map projection (with specific parameters), a choice of geodetic datum to bind the coordinate system to real locations on the earth, an origin point, and a choice of unit of measure. Hundreds of projected coordinate systems have been specified for various purposes in various regions. When the first standardized coordinate systems were created during the 20th Century, such as the Universal Transverse Mercator, State Plane Coordinate System, and British National Grid, they were commonly called ''grid systems''; the term is still common in some domains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northing
A projected coordinate system, also known as a projected coordinate reference system, a planar coordinate system, or grid reference system, is a type of spatial reference system that represents locations on the Earth using cartesian coordinates (''x'',''y'') on a planar surface created by a particular map projection. Each projected coordinate system, such as "Universal Transverse Mercator WGS 84 Zone 26N," is defined by a choice of map projection (with specific parameters), a choice of geodetic datum to bind the coordinate system to real locations on the earth, an origin point, and a choice of unit of measure. Hundreds of projected coordinate systems have been specified for various purposes in various regions. When the first standardized coordinate systems were created during the 20th Century, such as the Universal Transverse Mercator, State Plane Coordinate System, and British National Grid, they were commonly called ''grid systems''; the term is still common in some domains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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