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Generalized ArcView Shapefiles
Technical Information.
The generalized cartographic boundary files in ArcView Shapefile format, have been developed for various internal Census Bureau projects and have been made available here to the general public on an "as is" basis. ArcView Shapefiles are easily imported into many GIS packages, and is the recommended format over ASCII files.
Please note: The first four fields - Area, Perimeter, xxnn_d00_, xxnn_d00_I (where ""xx"" is Tr for Tract, Bg for Block Group, etc., and "nn" is the 2-digit state FIPS code) - are produced as a by-product of the cartographic boundary file creation process, and have no meaning for public data users, therefore, ignore or delete these fields.
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