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    • Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Data Products

    Metadata Updated: October 31, 2024

    Within the NOAA National Ocean Service (NOS), the NOAA National Geodetic Survey (NGS) has a federal mandate to provide accurate positioning, including heights, to all federal non-military mapping activities in the USA. In 2007, the NGS embarked on the Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Project, one of the most ambitious projects in the history of the agency. The gravity-based vertical datum resulting from this project is accurate at the 2 cm level where possible for much of the country. Available data include airborne and terrestrial survey information, gravity data, and gravity-based geoids or datums.

    Access & Use Information

    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 Date April 26, 2024
    Metadata Created Date October 31, 2024
    Metadata Updated Date October 31, 2024
    Reference Date(s) 2012 (publication), 2013-02 (revision), 2017-09 (revision)
    Frequency Of Update irregular

    Metadata Source

    Harvested from NGDC Collection

    Other Data Resources

    Graphic Preview

    Cover for the GRAV-D Project Plan.

    Additional Metadata

    Resource Type Dataset
    Metadata Date April 26, 2024
    Metadata Created Date October 31, 2024
    Metadata Updated Date October 31, 2024
    Reference Date(s) 2012 (publication), 2013-02 (revision), 2017-09 (revision)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact); NOAA National Geodetic Survey (Point of Contact)
    Contact Email
    Guid gov.noaa.ngdc:GRAV-D_Collection
    Access Constraints Cite As: NOAA National Geodetic Survey (2012): Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Data Products. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/cjc9-bh63. Accessed [date]., Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose., The following citations should be used in all presentations or publications that reference the GRAV-D work. Please replace the DATE tag in the following references with the date you downloaded the data or reports from the NGS website. To reference the general GRAV-D project operations, reference the GRAV-D Project Plan: The GRAV-D Project: Gravity for the Redefinition of the American Vertical Datum (2007). November 14, 2007. Online at: https://geodesy.noaa.gov/GRAV-D/pubs/GRAV-D_v2007_12_19.pdf GRAV-D Team (2017). "GRAV-D General Airborne Gravity Data User Manual." Theresa Damiani, Monica Youngman, and Jeffery Johnson ed. Version 2.1. Available DATE. Online at: https://www.ngs.noaa.gov/GRAV-D/data_products.shtml
    Bbox East Long 146.00
    Bbox North Lat 72.00
    Bbox South Lat -14.5
    Bbox West Long -180.00
    Coupled Resource
    Frequency Of Update irregular
    Graphic Preview Description Cover for the GRAV-D Project Plan.
    Graphic Preview File https://geodesy.noaa.gov/wp-content/uploads/2018/07/cover_sm2.png
    Graphic Preview Type png
    Harvest Object Id af98ff43-3ed1-4a9e-8714-ee22c914c35a
    Harvest Source Id 5088829e-ee94-4daf-8d22-e38f5358f506
    Harvest Source Title NGDC Collection
    Licence Not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For navigation, please refer to the NOS nautical chart series.
    Lineage Data in this database were provided by the NOAA National Geodetic Survey (NGS) and are archived by the NOAA National Centers for Environmental Information (NCEI).
    Metadata Language
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-180.0, -14.5], [146.0, -14.5], [146.0, 72.0], [-180.0, 72.0], [-180.0, -14.5]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System Through the collection reference systems have vaired with time and ___location. Please see survey level metadata for detailed information.
    Spatial Harvester True
    Temporal Extent Begin 2012-01-01
    Temporal Extent End 2023-12-31

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