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  1. en.wikipedia.org › wiki › List_of_longest_rivers_ofList of longest rivers of the United States (by main stem)

    Hace 3 días · The United States Geological Survey (USGS) defines a main-stem segment by listing coordinates for its two end points, called the source and the mouth. Some well-known rivers like the Atchafalaya , [2] Willamette , [3] and Susquehanna [4] are not included in this list because their main stems are shorter than 500 miles.

  2. www.usgs.gov › products › mapsGIS Data | U.S. Geological Survey - USGS.gov

    Hace 6 días · GIS Data. USGS is a primary source of geographic information system (GIS) data. Our data and information is presented in spatial and geographic formats, including The National Map, Earth Explorer, GloVIS, LandsatLook, and much more. Explore GIS Data Maps. Filter Total Items: 9481.

  3. ngmdb.usgs.govNational Geologic Map Database

    Hace 2 días · U.S. Department of the Interior | U.S. Geological Survey Supported by the National Cooperative Geologic Mapping Program Page Contact Information: Personnel Page Last Modified: Mon May 27 11:11:33 2024

    • (703) 648-6907
    • drsoller@usgs.gov

  4. www.usgs.gov › programs › VHPVolcano Hazards Program | U.S. Geological Survey - USGS.gov

    19 de abr. de 2024 · Volcano Hazards Program. There are about 170 potentially active volcanoes in the U.S. The mission of the USGS Volcano Hazards Program is to enhance public safety and minimize social and economic disruption from volcanic unrest and eruption through our National Volcano Early Warning System.

  5. ngmdb.usgs.gov › Info › standardsNational Geologic Map Database

    Hace 6 días · Two notable mechanisms now exist in the United States to promote the coordination of widely-accepted standards: 1) the National Geologic Mapping Act of 1992 stipulates that necessary standards be developed by USGS and the Association of American State Geologists (AASG) to support the National Geologic Map Database (NGMDB); and 2) the Federal ...

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  7. www.usgs.gov › programs › mineral-resources-programCritical Minerals | U.S. Geological Survey - USGS.gov

    Hace 5 días · Our objective is to develop a national-scale, geospatial database that is the authoritative source of the most important mines, mineral deposits, and mineral districts of the United States.

  8. ngmdb.usgs.gov › Info › standardsNGMDB | GeMS - USGS

    Hace 5 días · GeMS ("Geologic Map Schema", formerly "NCGMP09") is the standard schema for geologic map publications funded by the U.S. Geological Survey's National Cooperative Geologic Mapping Program (NCGMP). Its design specifies encoding the content analogous to that contained in a traditional geologic map published by the USGS and by State ...