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    • High Definition Geomagnetic Model 2021

    Metadata Updated: April 5, 2025

    The High Definition Geomagnetic Model (HDGM) is a global, high resolution model of the Earth's geomagnetic main and crustal field, providing magnetic field values (total field, dip, and declination) at any point above or below the Earth's surface. Well planners can use HDGM to compute magnetic reference values at any point, as well as easily integrate HDGM into their directional drilling software. HDGM is updated annually to correctly model secular changes in the geomagnetic field.

    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 May 14, 2020
    Metadata Created Date April 5, 2025
    Metadata Updated Date April 5, 2025
    Reference Date(s) November 15, 2020 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NGDC MGG Geophysical Models

    Other Data Resources

    Graphic Preview

    Declination contour maps that compare HDGM to global magnetic field models

    Additional Metadata

    Resource Type Model
    Metadata Date May 14, 2020
    Metadata Created Date April 5, 2025
    Metadata Updated Date April 5, 2025
    Reference Date(s) November 15, 2020 (publication)
    Responsible Party (Point of Contact); NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ngdc:HDGM2021
    Access Constraints 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., Cite as: NCEI Geomagnetic Modeling Team. 2019: High Definition Geomagnetic Model 2020. 1. NOAA National Centers for Environmental Information. Accessed [date]., The High Definition Geomagnetic Model is available to the public, but requires payment to recoup the cost of model development, custom software creation and testing, as well as customer service efforts. For more information please contact hdgm.support@noaa.gov
    Bbox East Long 180
    Bbox North Lat 90
    Bbox South Lat -90
    Bbox West Long -180
    Coupled Resource
    Frequency Of Update asNeeded
    Graphic Preview Description Declination contour maps that compare HDGM to global magnetic field models
    Graphic Preview File https://www.ngdc.noaa.gov/geomag/HDGM/images/hdgm_brazil.jpg
    Graphic Preview Type JPG
    Harvest Object Id dba55175-1ba0-4b27-be57-a01667a06d37
    Harvest Source Id 5ed471dc-74d7-4fff-9550-9d3d373a7a15
    Harvest Source Title NGDC MGG Geophysical Models
    Licence Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States.
    Lineage
    Metadata Language
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [180.0, -90.0], [180.0, 90.0], [-180.0, 90.0], [-180.0, -90.0]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 1900-01-01
    Temporal Extent End 2020-12-31

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