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Alpha-numeric grid : ウィキペディア英語版 | Alpha-numeric grid
An alphanumeric grid (also known as atlas grid〔http://encyclopedia2.thefreedictionary.com/atlas+grid Retrieved 2010-03-22.〕) is a simple coordinate system on a grid in which each cell is identified by a combination of a letter and a number.〔http://support.esri.com/index.cfm?fa=knowledgebase.gisDictionary.search&search=true&searchTerm=alphanumeric+grid Retrieved 2010-03-22.〕 An advantage over numeric coordinates, 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. Algebraic chess notation uses an alphanumeric grid to refer to the squares of a chessboard.〔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.〕 == References ==
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