EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
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.
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 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].
- doi:10.7289/V5MW2F2P
- NCEI Metadata ID: gov.noaa.ngdc.mgg.geophysical_models:EMAG2
gov.noaa.ngdc.mgg.geophysical_models:EMAG2
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Distribution Formats |
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | NCEI Geomagnetic Modeling Team NOAA National Centers for Environmental Information 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 |
West:-180
East:180
South:-90
North:90
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Spatial Coverage Map |
General Documentation |
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Edition | Version 2 |
Data Presentation Form | mapDigital |
Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
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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Access Constraints |
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Other Constraints | 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]. |
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Last Modified: 2020-05-14
For questions about the information on this page, please email:ncei.info@noaa.gov