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Geographic coordinate system
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== Structure == A geographic coordinate system is based on the shape of the Earth. Since the Earth is not a perfect sphere, modern coordinate systems use a mathematical model called an ellipsoid. This model allows positions to be measured in a consistent way. A full coordinate system usually includes a datum. A datum defines how the mathematical model of the Earth is placed in relation to the real Earth. Different datums can give slightly different coordinate values for the same location. The most widely used modern datum is [[WGS 84]], which is used by the Global Positioning System and many digital maps.
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