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reference system
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[coordinate systems, measurement]
A method for identifying positions on the globe. This is often constructed with a grid that either refers to the earth's latitude and longitude (graticule), or a planar equivalent that divides grid lines by a fixed length from a predefined point of origin.
[standards, measurement]
A collection of abstract principles, numerical standards, conventional values, models, and specifications for quantitatively describing the positions of points in space and how these positions vary over time.