is about
spatial region
information content entity
coordinate system
Alejandra Gonzalez-Beltran
Philippe Rocca-Serra
Orlaith Burke
http://en.wikipedia.org/wiki/Coordinate_system
In geometry, a coordinate system is a system which uses one or more numbers, or coordinates, to uniquely determine the position of a point or other geometric element on a manifold such as Euclidean space.
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