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central meridian

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  1. [coordinate systems] The line of longitude that defines the center and often the x-origin of a projected coordinate system. In planar rectangular coordinate systems of limited extent, such as state plane, grid north coincides with true north at the central meridian. Media/central-meridian.gif
  2. [coordinate systems] The geographic origin of the longitudinal x-coordinates for a map grid. Also called the longitude of origin or, less commonly, the longitude of center.

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