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

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.
Cite this dataset when used as a source.
gov.noaa.ngdc.mgg.geophysical_models:EMAG2
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Distributor | DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA,
U.S. Department of Commerce |
Dataset Point of Contact | NCEI Geomagnetic Modeling Team DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce geomag.models@noaa.gov |
Time Period | 1946-01-01 to 2008-12-01 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326 |
Spatial Bounding Box Coordinates |
N: 90
S: -90
E: 180
W: -180
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Spatial Coverage Map |
Documentation links not available. |
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Edition | Version 2 |
Data Presentation Form | mapDigital |
Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | As needed |
Purpose | Magnetic anomaly maps provide insight into the subsurface structure and composition of the Earth's crust. Over continental areas, magnetic anomalies illuminate geologic, tectonic, and geothermal evolution of crust and lithosphere. In the world's oceans, anomalies trending parallel to the isochrons (lines of equal age) reveal the temporal evolution of oceanic crust. Magnetic maps are widely used in the geological sciences and in resource exploration. |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Place keywords | Global Change Master Directory (GCMD) Location Keywords
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Use Constraints | No constraint information available |
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Fees | Fee information not available. |
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Last Modified: 2015-08-31
For questions about the information on this page, please email: Brian.Meyer@noaa.gov