Description Usage Arguments Value Note Author(s) See Also Examples
Extracts grid reference strings at various precisions from the supplied grid
reference string - if possible! For example, if you supply a 1km square
reference TL2998
, then you could get the 10km square TL29
, but
not a 100m square grid reference.
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grid |
the grid reference to be manipulated |
format |
the format you want back. The possibilities are: |
a list of class "gridref" with the following contents:
grid |
the original grid reference |
gfmt |
the grid reference string formatted as requested |
system |
the grid reference system, either "OSGB" or "OSNI" |
precision |
the precision of the formatted grid reference in metres |
Tetrads and 5kms
Tetrads are 2x2km squares and are often used for mapping distributions at a
the scale of a county or similar sized local area. They are labelled using
the 10km square followed by a single, upper-case letter (since there are 25
tetrads in a 10km square, the letter "O" is not used to avaiod confusion with
zero). For example: TL29S
. Letters are used as follows:
0 +---+---+---+---+---+
. | E | J | P | U | Z |
8 +---+---+---+---+---+
. | D | I | N | T | Y |
6 +---+---+---+---+---+
. | C | H | M | S | X |
4 +---+---+---+---+---+
. | B | G | L | R | W |
2 +---+---+---+---+---+
. | A | F | K | Q | V |
0 +---+---+---+---+---+
..0...2...4...6...8...0
This is named the DINTY system after the letters in the second row of this
table.
5x5km squares (sometimes called "pentads") are used for mapping at a regional
scale. They are labelled using the name of the 10km square followed by two
upper-case letters as follows:
0 +----+----+
. | NW | NE |
5 +----+----+
. | SW | SE |
0 +----+----+
..0....5....0
Stuart Ball, JNCC stuart.ball@jncc.gov.uk
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