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

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.

Data and Resources

Additional Info

Field Value
Last Updated August 3, 2019, 19:05
Created June 10, 2017, 18:17
access_constraints ["Cite as: Brian Meyer, Richard Saltus, Arnaud Chulliat (2017): EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution) Version 3. National Centers for Environmental Information, NOAA. Model. doi:10.7289/V5H70CVX [access date]", "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."]
bbox-east-long 360
bbox-north-lat 90
bbox-south-lat -90
bbox-west-long 0
contact-email geomag.models@noaa.gov
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2017-05-30"}]
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
guid gov.noaa.ngdc.mgg.geophysical_models:EMAG2_V3
licence ["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."]
metadata-date 2019-06-17
metadata-language
progress completed
resource-type dataset
responsible-party [{"name": "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[0.0, -90.0], [360.0, -90.0], [360.0, 90.0], [0.0, 90.0], [0.0, -90.0]]]}
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