A hectad is an area 10 km x 10 km square.
The term has a particular use in connection with the British
Ordnance Survey
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national grid, and then refers to any of the 100 such squares which make up a standard 100 km x 100 km
myriad
A myriad (from Ancient Greek grc, μυριάς, translit=myrias, label=none) is technically the number 10,000 (ten thousand); in that sense, the term is used in English almost exclusively for literal translations from Greek, Latin or Sinospher ...
; 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 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 coordina ...
of the western bound of the hectad and the one-digit
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 coordina ...
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
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