gov.noaa.ngdc.mgg.geophysical_models:EMAG2
dataset
NOAA National Centers for Environmental Information
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NCEI Contact Information
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information
pointOfContact
2020-05-14
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
2
row
10801
.033
column
5401
.033
area
true
World Geodetic System 1984
WGS 84
2007-08-27
revision
https://epsg.org/crs_4326/WGS-84.html
WGS 84
GML of World Geodetic System 1984 coordinate reference system.
information
resourceProvider
European Petroleum Survey Group
https://epsg.org/home.html
European Petroleum Survey Group Geodetic Parameter Registry
Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations.
search
publisher
urn:ogc:def:crs:EPSG::4326
EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
2009-08-07
publication
Version 2
2009-08-07
International DOI Foundation (IDF)
doi:10.7289/V5MW2F2P
NOAA National Centers for Environmental Information
NCEI Metadata ID: gov.noaa.ngdc.mgg.geophysical_models:EMAG2
NOAA National Centers for Environmental Information
publisher
Maus, S.
author
mapDigital
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.
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.
completed
historicalArchive
NOAA National Centers for Environmental Information
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NCEI Contact Information
Information for contacts at NCEI.
information
pointOfContact
NOAA National Centers for Environmental Information
NCEI Geomagnetic Modeling Team
geomag.models@noaa.gov
pointOfContact
asNeeded
http://geomag.colorado.edu/images/Looking_NW_at_Spain_s.jpg
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.
jpg
Earth Science > Solid Earth > Geomagnetism > Magnetic Field
Earth Science > Solid Earth > Geomagnetism > Magnetic Intensity
Earth Science > Solid Earth > Geomagnetism > Magnetic Anomalies
theme
Global Change Master Directory (GCMD) Science Keywords
2020-01-09
publication
9.1
NASA Goddard Space Flight Center, Earth Science Data and Information System
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Global Change Master Directory (GCMD) Keywords
The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
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custodian
Geographic Region > Global
place
Global Change Master Directory (GCMD) Location Keywords
2020-01-09
publication
9.1
NASA Goddard Space Flight Center, Earth Science Data and Information System
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Global Change Master Directory (GCMD) Keywords
The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
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DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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Global Change Master Directory (GCMD) Data Center Keywords
2020-01-09
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9.1
NASA Goddard Space Flight Center, Earth Science Data and Information System
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Global Change Master Directory (GCMD) Keywords
The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
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custodian
otherRestrictions
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.
otherRestrictions
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.
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.
otherRestrictions
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].
grid
eng; USA
geoscientificInformation
-180
180
-90
90
1946-01-01
2008-12-01
Grid Cell
modelResult
Magnetic Anomaly
8165
-3357
nanoTesla
Empty Grid Cell
Representation of grid cell with no measurement value.
-99999
NOAA National Centers for Environmental Information
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NCEI Contact Information
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information
distributor
In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
Contact NCEI for other distribution options and instructions.
PDF
Version 2
Full Resolution Map of EMAG2 as a poster
JPG
Version 2
Full Resolution Map of EMAG2 as a poster
JPG
Version 2
Full Resolution Map of EMAG2 as an image
Article
Version 2
Preprint of manuscript "EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements", submitted for publication to Geochem. Geophys. Geosyst.
Google Earth
Version 2
Plugin for Google Earth. Requires installation of Google Earth. See also https://productforums.google.com/forum/?fromgroups#!msg/gec-dynamic-data-layers/yYsaTFnIzYQ/RVwprs5WhPQJ[1-25]
XYZ/Zip
Version 2
ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.
GIS TIFF
Version 2
A georeferenced TIFF (GeoTIFF) with a resolution of 2 arc-minutes, which can be opened by ESRI ArcGIS or any other GIS application. The values (nT) are stored as 32-bit floating point.
GMT Grid
Version 2
A GMT (Generic Mapping Tools) compatible net CDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point.
GeoTIFF
Version 2
Color-relief: A 24-bit RGB georeferenced TIFF (GeoTIFF) color-relief visualization of the EMAG2 grid, which can be opened by ArcGIS or any other GIS application. The color scale legend is at http://geomag.colorado.edu/images/EMAG2_scale.png
https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc.mgg.geophysical_models:EMAG2/html
HTTPS
Metadata Landing Page
information
http://geomag.colorado.edu/emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html
HTTPS
EMAG2 Home Page
information
http://geomag.colorado.edu/images/EMAG2/EMAG2_poster_V2.pdf
EMAG2 Full Resolution Map poster
PDF of Full Resolution Map of EMAG2 as a poster
download
http://geomag.colorado.edu/images/EMAG2/EMAG2_poster_V2.jpg
EMAG2 Full Resolution Map poster
JPG of Full Resolution Map of EMAG2 as a poster.
download
http://geomag.colorado.edu/images/EMAG2/EMAG2_image_V2.jpg
EMAG2 Full Resolution Map image
JPG of Full Resolution Map of EMAG2 as an image.
download
http://geomag.colorado.edu/images/EMAG2/emag2.pdf
EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements
Preprint of manuscript "EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements", submitted for publication to Geochem. Geophys. Geosyst.
download
http://geomag.colorado.edu/images/EMAG2/EMAG2.kmz
Google Earth
Plugin for Google Earth. Requires installation of Google Earth.
download
http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.xyz.gz
XYZ/Zip
EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.
download
http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.tif
GIS TIFF
A georeferenced TIFF (GeoTIFF) with a resolution of 2-arc-minutes, which can be opened by ESRI ArcGIS or any other GIS application. The values (nT) are stored as 32-bit floating point.
download
http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.grd
GMT Grid
A GMT (Generic Mapping Tools) compatible netCDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point.
download
http://geomag.colorado.edu/images/EMAG2/EMAG2_image_V2.tif
Color-relief
A 24-bit RGB georeferenced TIFF (GeoTIFF) color-relief visualization of the EMAG2 grid, which can be opened by ArcGIS or any other GIS application.
download
http://geomag.colorado.edu/images/EMAG2/EMAG2_no_directional_gridding_2009-01-06.xyz.gz
XYZ/zip
EMAG2 (Version 2.0) ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid. This version was produced without directional gridding. Therefore, it has much sparser coverage but reflects more closely the actual measurements.
download
repository
NOAA National Centers for Environmental Information
NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
2015-04-22T00:00:00
model
Merged grids at 4 km altitude above geoid using Least Squares Collocation.
Processing steps were carried out collectively by the developers of the model. These developers are listed as authors of the associated paper "EMAG2: A 2-arc minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements" found at http://geomag.colorado.edu/images/EMAG2/emag2.pdf
Generic Mapping Tools (GMT)
2008-05-15
revision
EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements
2009-08-07
publication
http://geomag.org/info/Smaus/Doc/emag2.pdf
originator
1525-2027
National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map
2007-06-29
publication
http://geomag.org/info/Smaus/Doc/wdmam.pdf
Least Squares Collocation (LSC)
From all original ship and airborne measurements: subtracted main and external fields given by the Comprehensive Model (Sabaka et al., 2004)
Processing steps were carried out collectively by the developers of the model. These developers are listed as authors of the associated paper "EMAG2: A 2-arc minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements" found at http://geomag.colorado.edu/images/EMAG2/emag2.pdf
Generic Mapping Tools (GMT)
2008-05-15
revision
EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements
2009-08-07
publication
http://geomag.org/info/Smaus/Doc/emag2.pdf
originator
1525-2027
Main and external field subtraction from observations
Line-leveled the trackline data, minimizing misfits from neighboring and cross-over tracks.
Processing steps were carried out collectively by the developers of the model. These developers are listed as authors of the associated paper "EMAG2: A 2-arc minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements" found at http://geomag.colorado.edu/images/EMAG2/emag2.pdf
Generic Mapping Tools (GMT)
2008-05-15
revision
National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map
2007-06-29
publication
http://geomag.org/info/Smaus/Doc/wdmam.pdf
Line-leveled the trackline data, reducing cross-over errors from 92 nT to 70 nT rms and the misfit to the merged grid from 121 nT to 97 nT rms.
Merged the trackline data with the grid at 4 km altitude using Least Squares Collocation with anisotropic correlation function (directional gridding).
Processing steps were carried out collectively by the developers of the model. These developers are listed as authors of the associated paper "EMAG2: A 2-arc minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements" found at http://geomag.colorado.edu/images/EMAG2/emag2.pdf
Generic Mapping Tools (GMT)
2008-05-15
revision
National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map
2007-06-29
publication
http://geomag.org/info/Smaus/Doc/wdmam.pdf
Least Squares Collocation (LSC)
Substituted spherical harmonic degrees less than or equal to 120 (33 km wavelength) with CHAMP satellite magnetic anomaly model MF6 (Maus et al., 2008).
Processing steps were carried out collectively by the developers of the model. These developers are listed as authors of the associated paper "EMAG2: A 2-arc minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements" found at http://geomag.colorado.edu/images/EMAG2/emag2.pdf
Generic Mapping Tools (GMT)
2008-05-15
revision
EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements
2009-08-07
publication
http://geomag.org/info/Smaus/Doc/emag2.pdf
originator
1525-2027
Input data from the CHAMP satellite magnetic anomaly model MF6.
asNeeded
Modified for compliance to NCEI Template v1.2.