| EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution) |
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A global Earth Magnetic Anomaly Grid (EMAG2) has been compiled from satellite, ship,
and airborne magnetic measuremtents. EMAG2 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.
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![How can I download or order the data?](javascript:getTemplate('<table> <tr> <td> <table class="resultTable"><tr> <th>Online Access</th> <td><a href="http://geomag.org/models/EMAG2/EMAG2_poster_V2.pdf">EMAG2 Full Resolution Map poster</a><br/>PDF of Full Resolution Map of EMAG2 as a poster<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_poster_V2.jpg">EMAG2 Full Resolution Map poster</a><br/>JPG of Full Resolution Map of EMAG2 as a poster.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_image_V2.jpg">EMAG2 Full Resolution Map image</a><br/>JPG of Full Resolution Map of EMAG2 as an image.<br/><br/><a href="http://geomag.org/info/Smaus/Doc/emag2.pdf">EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements</a><br/>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.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2.kmz">Google Earth</a><br/>Plugin for Google Earth. Requires installation of Google Earth.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_V2.xyz.gz">XYZ/Zip</a><br/>EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_V2.tif">GIS TIFF</a><br/>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.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_V2.grd">GMT Grid</a><br/>A GMT (Generic Mapping Tools) compatible netCDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_image_V2.tif">Color-relief</a><br/>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.<br/><br/></td> </tr><tr> <th>Order Details</th> <td><b>Cost: </b>None</td> </tr></table></td> </tr> </table>')){kind=link}
![What are the URLs and other online resources associated with this data set?](javascript:getTemplate('<table> <tr> <td> <table class="resultTable"><tr> <th>Information</th> <td><a href="http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4326">WGS 84</a><br/>GML of World Geodetic System 1984 coordinate reference system.<br/><br/><a href="http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso">GCMD Feedback Form</a><br/>Have a Comment for the GCMD?<br/><br/><a href="http://gcmd.nasa.gov/learn/keyword_list.html">GCMD Keywords Page</a><br/>This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions.<br/><br/></td> </tr><tr> <th>Search</th> <td><a href="http://www.epsg-registry.org/">European Petroleum Survey Group Geodetic Parameter Registry</a><br/>Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations.<br/><br/></td> </tr><tr> <th>Download</th> <td><a href="http://geomag.org/models/EMAG2/EMAG2_poster_V2.pdf">EMAG2 Full Resolution Map poster</a><br/>PDF of Full Resolution Map of EMAG2 as a poster<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_poster_V2.jpg">EMAG2 Full Resolution Map poster</a><br/>JPG of Full Resolution Map of EMAG2 as a poster.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_image_V2.jpg">EMAG2 Full Resolution Map image</a><br/>JPG of Full Resolution Map of EMAG2 as an image.<br/><br/><a href="http://geomag.org/info/Smaus/Doc/emag2.pdf">EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements</a><br/>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.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2.kmz">Google Earth</a><br/>Plugin for Google Earth. Requires installation of Google Earth.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_V2.xyz.gz">XYZ/Zip</a><br/>EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_V2.tif">GIS TIFF</a><br/>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.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_V2.grd">GMT Grid</a><br/>A GMT (Generic Mapping Tools) compatible netCDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point.<br/><br/><a href="http://geomag.org/models/EMAG2/EMAG2_image_V2.tif">Color-relief</a><br/>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.<br/><br/></td> </tr><tr> <th>Unknown Function</th> <td><a href="http://www.geomag.org/models/emag2.html">http://www.geomag.org/models/emag2.html</a><br/><br/></td> </tr><tr> <th>Unknown Function</th> <td><a href="http://geomag.org/info/Smaus/Doc/emag2.pdf">http://geomag.org/info/Smaus/Doc/emag2.pdf</a><br/><br/></td> </tr><tr> <th>Unknown Function</th> <td><a href="http://geomag.org/info/Smaus/Doc/wdmam.pdf">http://geomag.org/info/Smaus/Doc/wdmam.pdf</a><br/><br/></td> </tr><tr> <th>Unknown Function</th> <td><a href="http://geomag.org/info/Smaus/Doc/emag2.pdf">http://geomag.org/info/Smaus/Doc/emag2.pdf</a><br/><br/></td> </tr><tr> <th>Unknown Function</th> <td><a href="http://geomag.org/info/Smaus/Doc/wdmam.pdf">http://geomag.org/info/Smaus/Doc/wdmam.pdf</a><br/><br/></td> </tr><tr> <th>Unknown Function</th> <td><a href="http://geomag.org/info/Smaus/Doc/wdmam.pdf">http://geomag.org/info/Smaus/Doc/wdmam.pdf</a><br/><br/></td> </tr><tr> <th>Unknown Function</th> <td><a href="http://geomag.org/info/Smaus/Doc/emag2.pdf">http://geomag.org/info/Smaus/Doc/emag2.pdf</a><br/><br/></td> </tr></table> </td> </tr> </table>')){kind=link}