Alphanumeric grid

An alphanumeric grid (also known as atlas grid[1]) is a simple coordinate system on a grid in which each cell is identified by a combination of a letter and a number.[2]

abcdef
1 a1b1c1d1e1f1
2 a2b2c2d2e2f2
3 a3b3c3d3e3f3
4 a4b4c4d4e4f4
5 a5b5c5d5e5f5
6 a6b6c6d6e6f6

An advantage over numeric coordinates such as easting and northing, which use two numbers instead of a number and a letter to refer to a grid cell, is that there can be no confusion over which coordinate refers to which direction. As an easy example, one could think about battleship; simply match the number at the top to the number on the bottom, then follow the two lines until they meet in a spot.

Algebraic chess notation uses an alphanumeric grid to refer to the squares of a chessboard.[3]

Some kinds of geocode also use letters and numbers, typically several of each in order to specify many more locations over much larger regions.

References

  1. http://encyclopedia2.thefreedictionary.com/atlas+grid Retrieved 2010-03-22.
  2. "Archived copy". Archived from the original on 2007-10-10. Retrieved 2010-03-22.CS1 maint: archived copy as title (link) Retrieved 2010-03-22.
  3. http://www.fide.com/fide/handbook?id=125&view=article Appendices in World Chess Federation Handbook: see part C.7 of section C. Algebraic notation. Retrieved 2010-03-22.
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