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    • National-Scale Grid to Support Regional Groundwater Availability Studies and a National Hydrogeologic Database

    Metadata Updated: July 6, 2024

    The National Hydrogeologic Grid (NHG) dataset includes a raster and vector representation of 1-km cells defining a uniform grid that encompasses the continental United States. The value of each cell of the raster dataset corresponds to the 1-km cell number defined as 'cellnum' in the attributes of the vector data. The NHG consists of 4,000 rows and 4,980 columns, numbered from the top left corner of the grid, to correspond to the traditional row and column numbering system of the MODFLOW groundwater-flow simulation code (Hughes and others, 2017; Langevin and others, 2017). The Albers projection was chosen for the NHG because of the capability to best preserve area, which is crucial in the computation of volume for water-resource investigations (Kuniansky, 2016). The upper left coordinate of the NHG in the Albers projection, in units of meters is -2553045.0, 3907285.0 with a rotation of zero degrees.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date June 1, 2023
    Metadata Updated Date July 6, 2024

    Metadata Source

    Harvested from DOI EDI

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date June 1, 2023
    Metadata Updated Date July 6, 2024
    Publisher U.S. Geological Survey
    Maintainer
    @Id http://datainventory.doi.gov/id/dataset/3deb69339266cab23dc64f4681869a37
    Identifier USGS:5a95dd5de4b06990606a805e
    Data Last Modified 20200826
    Category geospatial
    Public Access Level public
    Bureau Code 010:12
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://datainventory.doi.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 7c6c01d7-3647-4c5c-8263-5636a1e3e794
    Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
    Harvest Source Title DOI EDI
    Metadata Type geospatial
    Old Spatial -134.108,19.45,-59.59,53.608
    Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
    Source Datajson Identifier True
    Source Hash 4d875d318b0961813febb2a08bc5e9505d6df5fcf9d29b35aaf52413c3429028
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -134.108, 19.45, -134.108, 53.608, -59.59, 53.608, -59.59, 19.45, -134.108, 19.45}

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