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Grid References
6. DINTY Tetrads
This form of subdivision is generally seen as non-standard, but is encountered frequently within the world of recording, specifically for local distribution maps. This form of grid reference involves the production of 2km squares, and so divides one 10km square into 25 equal squares, (figure 8
).
Figure 8; DINTY Tetradsfigure 8
, the labelling commences in the bottom left-hand corner, and follows the alphabet moving up the left side, moving one column to the right once the top of the square is reached. As with the 5km squares above, the name of any individual 2km tetrad is the name of the 10km square it resides in followed by the single letter shown above. The highlighted tetrad above has a grid reference of TQ75G. The 10km square can be seen to be TQ75 by the labels along the sides, with all west-east numbers beginning with 7, and all south-north numbers beginning with 5. Any record ending with a single letter could be located anywhere within that 2km square, or in this case within any of the 1km squares TQ7252, TQ7253, TQ7352 or TQ7353. The reason this system is sometimes called the DINTY tetrad system, is because the 'word' DINTY is spelled out reading across the second row down.As with the 5km squares (
see 5. Non-standard Grid
), this form of subdivision could theoretically be used at different measurement levels, and thus a grid reference of TR6437B would refer to anywhere within the 200m x 200m square located within the 1km square TR6437 using the same grid labelling method shown in the 2km tetrad method above.
