1:100,000-scale Counties of the United States
收藏U.S. Geological Survey2023-01-01 更新2026-04-23 收录
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https://www.sciencebase.gov/catalog/item/631405b7d34e36012efa2f86
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These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This is a coverage of the county boundaries of the conterminous United States (AK, HI and Puerto Rico are available separately). The lines were extracted from U.S. Census TIGER/line files using an AML program (see 4.), written by Doug Nebert and Mark Negri, running on two Data General 6220 servers. Counties Boundaries United States
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U.S. Geological Survey
创建时间：
2023-01-01
