Description
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.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| EMAG2 Home Page | HTML | emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html | Open resource |
| EMAG2 Full Resolution Map image | JPG | JPG of Full Resolution Map of EMAG2 as an image. | Open resource |
| Color-relief | TIFF | 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. | Open resource |
| Google Earth | KML | Plugin for Google Earth. Requires installation of Google Earth. | Open resource |
| XYZ/zip | XYZ | 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. | Open resource |
| 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. | Open resource | |
| EMAG2 Full Resolution Map poster | JPG | JPG of Full Resolution Map of EMAG2 as a poster. | Open resource |
| EMAG2 Full Resolution Map poster | PDF of Full Resolution Map of EMAG2 as a poster | Open resource | |
| GMT Grid | Unknown | A GMT (Generic Mapping Tools) compatible netCDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point. | Open resource |
| GIS TIFF | 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. | Open resource |
| XYZ/Zip | XYZ | EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid. | Open resource |
| Global Change Master Directory (GCMD) Keywords | Unknown | 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. | Open resource |
| Global Change Master Directory (GCMD) Keywords | Unknown | 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. | Open resource |
| Global Change Master Directory (GCMD) Keywords | Unknown | 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. | Open resource |
| NCEI Contact Information | Unknown | Information for contacts at NCEI. | Open resource |
| Metadata Landing Page | Unknown | Open resource |