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Why were two versions of the TIGER/Line Shapefiles released in 2008?

April 26, 2017line released shapefiles Tiger versions

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Why were two versions of the TIGER/Line Shapefiles released in 2008?

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The 2007 TIGER/Line Shapefiles were released in March of 2008, and the 2008 TIGER/Line Shapefiles were released in December of 2008. The year noted in the name of the TIGER/Line Shapefiles represents the vintage of the boundaries in the file. Thus, the 2007 TIGER/Line Shapefiles contain the boundaries for governmental units as of January 1, 2007 as reported in the 2007 Boundary and Annexation Survey, and the 2008 TIGER/Line Shapefiles contain the boundaries as of January 1, 2008.