- Process_Description:
- Data was compiled, created, and released by U.S. Geological Survey: Public Land Survey System data were collected from 1:500,000 and 1:1,000,000 State base maps for the western United States. The eastern States were collected from existing 1:100,000-scale base maps. Data from both sources were integrated into 1:2,000,000 State-level DLG files, then generalized and vertically integrated with 2MILBD (1:2,000,000-scale Digital Line Graph Data - Boundaries), ATLAS-CNTY (County Boundaries of the U.S.), and ATLAS-HY (Hydrography features of the U.S.). The resulting Public Land Survey System DLG files were published on CD-ROM in 1995.The DLG optional-format files were then converted to Arc/INFO coverages, and the individual State files were paneled together into a national coverage. Numeric DLG codes were translated into English, non-polygon features were deleted, and the data set was converted to shapefile format.
- Process_Date:
2002