1. Home
  3. National Oceanic and ...
  • Submit Data Story
  • Report Data Issue

  • EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)

    Metadata Updated: February 7, 2018

    EMAG2 is a global Earth Magnetic Anomaly Grid compiled from satellite, ship, and airborne magnetic measurements. It is a significant update of our previous candidate grid for the World Digital Magnetic Anomaly Map. The resolution has been improved from 3 arc-minutes to 2 arc-minutes, and the altitude has been reduced from 5 km to 4 km above the geoid. Additional 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 directional gridding and extrapolation, based on oceanic crustal age model. The longest wavelengths (>330 km) were replaced with the latests CHAMP satellite magnetic field model MF6.

    Access & Use Information

    License: U.S. Government Work

    Downloads & Resources

    Dates

    Metadata Date August 31, 2015
    Metadata Created Date February 7, 2018
    Metadata Updated Date February 7, 2018
    Reference Date(s) August 7, 2009 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NOAA CSW Harvest Source

    Graphic Preview

    EMAG2 looking north-west at Portugal/Spain from the Atlantic. Kursk (Russia) is seen as a strong anomaly in the background. The stripes on the left of the image are magnetic lineations due to sea-floor spreading.

    Additional Metadata

    Resource Type Dataset
    Metadata Date August 31, 2015
    Metadata Created Date February 7, 2018
    Metadata Updated Date February 7, 2018
    Reference Date(s) August 7, 2009 (publication)
    Responsible Party DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
    Contact Email
    Access Constraints
    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 EMAG2 looking north-west at Portugal/Spain from the Atlantic. Kursk (Russia) is seen as a strong anomaly in the background. The stripes on the left of the image are magnetic lineations due to sea-floor spreading.
    Graphic Preview File http://geomag.colorado.edu/images/Looking_NW_at_Spain_s.jpg
    Graphic Preview Type jpg
    Guid gov.noaa.ngdc.mgg.geophysical_models:EMAG2
    Harvest Object Id 1d6bb696-6361-421f-826d-62164e520d00
    Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
    Harvest Source Title NOAA CSW Harvest Source
    Licence Cite as: Stefan Maus (2009): EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution). National Geophysical Data Center, NOAA. Model. doi:10.7289/V5MW2F2P [access date], Produced by the NOAA National Geophysical Data Center. 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., While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
    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 2008-12-01

    Didn't find what you're looking for? Suggest a dataset here.