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  • EMAG2v3: Earth Magnetic Anomaly Grid (2-arc-minute resolution)

    Metadata Updated: November 12, 2020

    EMAG2v3 is a global Earth Magnetic Anomaly Grid compiled from satellite, ship, and airborne magnetic measurements. It is a significant update of the previous release of the Earth Magnetic Anomaly Grid. The resolution remains 2 arc-minutes, and the altitude of 4 km above the geoid is still supported, but an additional product, a grid that is observed at sea-level over oceanic regions, has been produced. New additions grid and track line data have been included, both over land and the oceans. Wherever available, the original shipborne and airborne data were used instead of precompiled oceanic magnetic grids. Interpolation between sparse track lines in the oceans was improved by using a kriging algorithm, which specializes in heterogeneous data distribution gridding, in order to create a compilation as true to the observed data as possible, and avoid using a priori information. The longest wavelengths (>300 km) were replaced with the latests satellite lithosphere magnetic field model, MF7.

    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.

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    Dates

    Metadata Date May 14, 2020
    Metadata Created Date November 12, 2020
    Metadata Updated Date November 12, 2020
    Reference Date(s) May 30, 2017 (publication)
    Frequency Of Update asNeeded

    Graphic Preview

    EMAG2v3 showing the west coast of the United States and Canada. The stripes are magnetic lineations due to sea-floor spreading.

    Additional Metadata

    Resource Type Dataset
    Metadata Date May 14, 2020
    Metadata Created Date November 12, 2020
    Metadata Updated Date November 12, 2020
    Reference Date(s) May 30, 2017 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ngdc.mgg.geophysical_models:EMAG2_V3
    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: Brian Meyer; Richard Saltus; and Arnaud Chulliat. 2017: EMAG2v3: Earth Magnetic Anomaly Grid (2-arc-minute resolution). Version 3. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V5H70CVX. Accessed [date].
    Bbox East Long 360
    Bbox North Lat 90
    Bbox South Lat -90
    Bbox West Long 0
    Coupled Resource
    Frequency Of Update asNeeded
    Graphic Preview Description EMAG2v3 showing the west coast of the United States and Canada. The stripes are magnetic lineations due to sea-floor spreading.
    Graphic Preview File http://www.ngdc.noaa.gov/geomag/image/EMAG2_V3_UpCont_WestCoastUS.png
    Graphic Preview Type png
    Harvest Object Id a8bee894-398e-4348-85e6-ecb5ca1e3ff9
    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., 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.
    Metadata Language
    Metadata Type geospatial
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 1946-01-01
    Temporal Extent End 2014-02-20

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