Data Basin is a science-based mapping and analysis platform that supports learning, research, and sustainable environmental stewardship.
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The DLG data files derived from the 1:2,000,000-scale maps contain
selected base categories of cartographic data in digital form. The data
files are derived from the sectional maps of the 1970 National Atlas of
the United States of America. The Boundaries category includes boundary
information collected in two separate subcategories: (1) Political
Boundaries and (2) Administrative Boundaries. The Hydrography data
includes data in three separate subcategories: (1) Streams, (2) Water
Bodies, and (3) Hypsography (Continental Divide only). The
Transportation category of data includes major transportation systems
collected in three separate subcategories: (1) Roads and Trails, (2)
Railroads, and (3) Cultural Features (airports and Alaska pipeline).
Layers in this dataset are based on combinations of the following options.
You may choose from these options to select a specific layer on the map page.