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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 (unit of area)|hectad]].<ref name="KMBRC">{{cite web|url=http://www.kmbrc.org.uk/recording/help/gridrefhelp.php?page=6|title=DINTY Tetrads|publisher=Kent and Medway Biological Records Centre|accessdate=23 December 2008|url-status=dead|archiveurl=https://web.archive.org/web/20110527152140/http://www.kmbrc.org.uk/recording/help/gridrefhelp.php?page=6|archivedate=27 May 2011}}</ref> |
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 (unit of area)|hectad]].<ref name="KMBRC">{{cite web|url=http://www.kmbrc.org.uk/recording/help/gridrefhelp.php?page=6|title=DINTY Tetrads|publisher=Kent and Medway Biological Records Centre|accessdate=23 December 2008|url-status=dead|archiveurl=https://web.archive.org/web/20110527152140/http://www.kmbrc.org.uk/recording/help/gridrefhelp.php?page=6|archivedate=27 May 2011}}</ref> |
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The term comes from the [[Greek language|Greek]] word ''tetras'' meaning "four".<ref>{{cite web |title=Collins English Dictionary |url=https://www.collinsdictionary.com/dictionary/english/tetrad |access-date=9 February 2024}}</ref> |
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Tetrads are sometimes used by biologists for reporting the distribution of species to maintain a degree of confidentiality about their data,<ref>{{cite web|url=http://www.sxbrc.org.uk/biodiversity/recording/ngr.php|title=National Grid References|date=2008|publisher=Sussex Biodiversity Record Centre|accessdate=23 December 2008}}</ref> though the system is not in universal use.<ref name="KMBRC" /> |
Tetrads are sometimes used by biologists for reporting the distribution of species to maintain a degree of confidentiality about their data,<ref>{{cite web|url=http://www.sxbrc.org.uk/biodiversity/recording/ngr.php|title=National Grid References|date=2008|publisher=Sussex Biodiversity Record Centre|accessdate=23 December 2008}}</ref> though the system is not in universal use.<ref name="KMBRC" /> |
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Revision as of 12:46, 9 February 2024
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.[1]
The term comes from the Greek word tetras meaning "four".[2]
Tetrads are sometimes used by biologists for reporting the distribution of species to maintain a degree of confidentiality about their data,[3] though the system is not in universal use.[1]
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.[1]
| E | J | P | U | Z |
| D | I | N | T | Y |
| C | H | M | S | X |
| B | G | L | R | W |
| A | F | K | Q | V |
References
- ^ a b c "DINTY Tetrads". Kent and Medway Biological Records Centre. Archived from the original on 27 May 2011. Retrieved 23 December 2008.
- ^ "Collins English Dictionary". Retrieved 9 February 2024.
- ^ "National Grid References". Sussex Biodiversity Record Centre. 2008. Retrieved 23 December 2008.
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