Original GIS polygon dataset derived from the 1990 Census Bureau's TIGER files. The original scale of the data is 1:100,000 and covers the entire state of Mississippi. Using coding from the TIGER files, this dataset includes only county boundaries. . *** Data was updated in April 2007 using 1:24,000 USGS Digital Raster Graphics. ** Gulf Coastal Boundary was updated in May 2015 by MARIS staff using the guidance of MDEQ Office of Geology's Mississippi/Louisiana border based using 1906 Supreme Court decision, MDEQ’s Offshore Mineral Lease map, and the US Bureau of Ocean Energy, Mapping and Boundary Branch's Submerged Lands Act 2011 Boundary.
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