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

Metadata Updated: November 12, 2020

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: 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 November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) August 7, 2009 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NGDC MGG Geophysical Models

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 May 14, 2020
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) August 7, 2009 (publication)
Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
Contact Email
Guid gov.noaa.ngdc.mgg.geophysical_models:EMAG2
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: Maus, S.. 2009: EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution). Version 2. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V5MW2F2P. 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 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
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 2008-12-01

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