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central meridian - [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.
[Category=Geospatial ]
Source: esri, 15 February 2012 09:37:23, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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