EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)View Metadata As: Get Data, FAQ, HTML, 19139 XML
Assess Metadata For: Completeness, DOI Readiness, CSW Readiness, Components
EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
doi:10.7289/V5MW2F2P
browse graphicEMAG2 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.

Get the Data
AccessFormat(s)Distributor(s) / Contact InfoInstructions / Constraints
download
EMAG2 Full Resolution Map poster
PDF of Full Resolution Map of EMAG2 as a poster
download
EMAG2 Full Resolution Map poster
JPG of Full Resolution Map of EMAG2 as a poster.
download
EMAG2 Full Resolution Map image
JPG of Full Resolution Map of EMAG2 as an image.
download
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
Google Earth
Plugin for Google Earth. Requires installation of Google Earth.
download
XYZ/Zip
EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.
download
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
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
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.
Full Resolution Map
Format version: Version 2
Format specification: PDF of EMAG2 as a poster
Full Resolution Map
Format version: Version 2
Format specification: JPG of EMAG2 as a poster
Full Resolution Map
Format version: Version 2
Format specification: JPG of EMAG2 as an image
Article
Format version: Version 2
Format specification: 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
Format version: Version 2
Format specification: 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
Format version: Version 2
Format specification: ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.
GIS TIFF
Format version: Version 2
Format specification: 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
Format version: Version 2
Format specification: 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.
Color-relief
Format version: Version 2
Format specification: 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.org/models/EMAG2/EMAG2_scale.png
Use Limitation
Cite as: Stefan Maus (2009): EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution). National Geophysical Data Center, NOAA. Model. doi:10.7289/V5MW2F2P [access date]

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.

While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.