A hectad is an area 10 km x 10 km square.
The term has a particular use in connection with the British
Ordnance Survey
The Ordnance Survey (OS) is the national mapping agency for Great Britain. The agency's name indicates its original military purpose (see Artillery, ordnance and surveying), which was to map Scotland in the wake of the Jacobite rising of ...
national grid, and then refers to any of the 100 such squares which make up a standard 100 km x 100 km
myriad
In the context of numeric naming systems for powers of ten, myriad is the quantity ten thousand ( 10,000). Idiomatically, in English, ''myriad'' is an adjective used to mean that a group of things has indefinitely large quantity.
''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
A projected coordinate systemalso called a projected coordinate reference system, planar coordinate system, or grid reference systemis a type of spatial reference system that represents locations on Earth using Cartesian coordinates (''x'', '' ...
of the western bound of the hectad and the one-digit
northing
A projected coordinate systemalso called a projected coordinate reference system, planar coordinate system, or grid reference systemis a type of spatial reference system that represents locations on Earth using Cartesian coordinates (''x'', '' ...
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.
The term comes from the Greek
Greek may refer to:
Anything of, from, or related to Greece, a country in Southern Eur ...
References
Units of area
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