National Geophysical Data Center (NGDC), NOAA Satellite and Information Service

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Declination Calculator

browse graphicMagnetic Declination map for North America for the year 2010
Declination is calculated using the current International Geomagnetic Reference Field (IGRF) model. 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 this dataset when used as a source.

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    Distribution Formats
    • HTML Format (Version: 1)
    • XML Format (Version: 1)
    • CSV Format (Version: 1)
    • PDF Format (Version: 1)
    Distributor Distributor information not available
    No point of contact available for this dataset
    Documentation links not available.
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • publication: 2009-12-01
    Data Presentation Form: mapDigital
    Dataset Progress Status Complete
    Data Update Frequency: As needed
    Purpose: The purpose of the calculators is to deliver trusted magnetic field values - past, present, and near future - to aid the public as well as the scientific community in proper navigation, positioning, and other operational and research magnetic field scenarios.
    Time Period: 1900-01-01  to  2014-12-31
    Spatial Reference System:
    Spatial Bounding Box Coordinates:
    N: 90
    S: -90
    E: 180
    W: -180
    Spatial Coverage Map:
    • EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Field
    • EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Declination
    • Geographic Region > Global
    Use Constraints No constraint information available
    • None
    Source Datasets
    • International Geomagnetic Reference Field 11
    Lineage Statement Lineage statement not available.
    Processing Steps
    • User input of area of interest and time for desired data grid into a web interface.
    • User data is sent via HTTP request to a java servelet hosted on a local NGDC server. This checks that all of the necessary information to run the model executable correctly is present and in the correct format.
    • NGDC server accesses a C executable, in this case the IGRF executable, and inputs the user data and runs the executable to obtain desired output parameters in XML format.
    • The XML created by the executable is sent back to NGDC server and input into the Java servelet which reformats the output into the format designated by the user at the begining of the process. This reformatted information is returned to the User's webpage.

    Metadata Last Modified: 2015-08-31

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