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    • US Historic Declination Calculator

    Metadata Updated: September 22, 2023

    This programs derives a table of secular change in magnetic declination for a specified point in the conterminous United States. It utilizes the USD polynomial and the IGRF spherical harmonic models. Declination is calculated using the current World Magnetic Model (WMM) or International Geomagnetic Reference Field (IGRF) model. While results are typically accurate to 30 minutes of arc, users should be aware that several environmental factors can cause disturbances in the magnetic 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 September 22, 2023
    Metadata Updated Date September 22, 2023
    Reference Date(s) December 1, 2009 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NGDC MGG Geophysical Models

    Other Data Resources

    Graphic Preview

    Magnetic Declination map for North America for the year 2010

    Additional Metadata

    Resource Type Service
    Metadata Date May 14, 2020
    Metadata Created Date September 22, 2023
    Metadata Updated Date September 22, 2023
    Reference Date(s) December 1, 2009 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ngdc.mgg.geophysical_models:US_Historic_Declination_Calculator
    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. 2009: US Historic Declination Calculator. NOAA National Centers for Environmental Information. Accessed [date].
    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 Magnetic Declination map for North America for the year 2010
    Graphic Preview File https://www.ngdc.noaa.gov/geomag/img/DeclinationMap_US.png
    Graphic Preview Type PNG
    Harvest Object Id 77872e80-28a4-44fb-8127-069b951cb21a
    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 1750-01-01
    Temporal Extent End 2014-12-31

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