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Just to explain why I removed Siting Huo's edit (Coordinate System in GIS): it's too specific, it doesn't belong in a general article on coordinate systems. I tried looking later in the page for a place where it should go, but the whole article is on too much of a general level for that. Perhaps "Coordinates in GIS" should be a separate page, or perhaps it should be in Map Projection. — Preceding unsigned comment added by Jim Pivarski (talk • contribs) 23:47, 31 January 2013 (UTC)
I'm not sure what would be the best way to write the idea correctly on the basic description, but what about non-number coordinates? A great example would be Chess Coordinates, where "E2" defines a position in an R^2 universe. — Preceding unsigned comment added by 126.96.36.199 (talk) 13:48, 1 November 2013 (UTC)