Hectad (unit of area)
Encyclopedia
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.
The term has a particular use in connection with the British Ordnance Survey
Ordnance Survey
Ordnance Survey , an executive agency and non-ministerial government department of the Government of the United Kingdom, is the national mapping agency for Great Britain, producing maps of Great Britain , and one of the world's largest producers of maps.The name reflects its creation together with...
national grid
British national grid reference system
The Ordnance Survey National Grid reference system is a system of geographic grid references used in Great Britain, different from using latitude and longitude....
, and then refers to any of the 100 such squares which make up a standard 100 km x 100 km myriad
Myriad (unit of area)
A myriad is an area 100 km × 100 km square i.e. it is 10,000 square kilometer. 100 of these squares would be one million square kilometers....
; 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.