Tetrad (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 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 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.
Source: Wikipedia "Tetrad (area)" · CC BY-SA 4.0
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