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Dataset Overview | National Centers for Environmental Information (NCEI)

US Historic Declination Calculator

browse graphicMagnetic Declination map for North America for the year 2010
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.
  • Cite as: NCEI Geomagnetic Modeling Team. 2009: US Historic Declination Calculator. NOAA National Centers for Environmental Information. Accessed [date].
  • NCEI Metadata ID: gov.noaa.ngdc.mgg.geophysical_models:US_Historic_Declination_Calculator
gov.noaa.ngdc.mgg.geophysical_models:US_Historic_Declination_Calculator
Full Text · XML
Distribution Formats
    Ordering Instructions Contact NCEI for other distribution options and instructions.
    Distributor NOAA National Centers for Environmental Information
    ncei.info@noaa.gov
    Dataset Point of Contact NOAA National Centers for Environmental Information
    ncei.info@noaa.gov
    Dataset Point of Contact NCEI Geomagnetic Modeling Team
    NOAA National Centers for Environmental Information
    geomag.models@noaa.gov
    Time Period 1750-01-01 to 2014-12-31
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Bounding Box Coordinates
    West: -180
    East: 180
    South: -90
    North: 90
    Spatial Coverage Map
    Publication Dates
    • publication: 2009-12-01
    Data Presentation Form mapDigital
    Dataset Progress Status Complete - production of the data has been completed
    Historical archive - data has been stored in an offline storage facility
    Data Update Frequency As needed
    Purpose The purpose of the calculators is to deliver trusted magnetic field values from past observations to aid the public as well as the scientific community in proper navigation, positioning, and other operational and research magnetic field scenarios.
    Use Limitations
    • Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States.
    Dataset Citation
    • Cite as: NCEI Geomagnetic Modeling Team. 2009: US Historic Declination Calculator. NOAA National Centers for Environmental Information. Accessed [date].
    Cited Authors
    • NCEI Geomagnetic Modeling Team
    Publishers
    • NOAA National Centers for Environmental Information
    Theme keywords Global Change Master Directory (GCMD) Science Keywords
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Field
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Declination
    Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Place keywords Global Change Master Directory (GCMD) Location Keywords
    • Geographic Region > Global
    Use Constraints
    • 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.
    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.
    Other Constraints Cite as: NCEI Geomagnetic Modeling Team. 2009: US Historic Declination Calculator. NOAA National Centers for Environmental Information. Accessed [date].
    Fees
    • In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
    Lineage information for: repository
    Processing Steps
    • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
    Last Modified: 2020-05-14
    For questions about the information on this page, please email: ncei.info@noaa.gov