EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)

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
0 https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc.mgg.geophysical_models:EMAG2/html
21 emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html http://geomag.colorado.edu/emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html
33 PDF of Full Resolution Map of EMAG2 as a poster http://geomag.colorado.edu/images/EMAG2/EMAG2_poster_V2.pdf
22 JPG of Full Resolution Map of EMAG2 as a poster. http://geomag.colorado.edu/images/EMAG2/EMAG2_poster_V2.jpg
22 JPG of Full Resolution Map of EMAG2 as an image. http://geomag.colorado.edu/images/EMAG2/EMAG2_image_V2.jpg
25 Plugin for Google Earth. Requires installation of Google Earth. http://geomag.colorado.edu/images/EMAG2/EMAG2.kmz
56 EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid. http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.xyz.gz
0 A GMT (Generic Mapping Tools) compatible netCDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point. http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.grd
48 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. http://geomag.colorado.edu/images/EMAG2/EMAG2_image_V2.tif
56 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. http://geomag.colorado.edu/images/EMAG2/EMAG2_no_directional_gridding_2009-01-06.xyz.gz
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
33 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. http://geomag.colorado.edu/images/EMAG2/emag2.pdf
48 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. http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.tif
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords

Tags

  • nesdis
  • magnetic field
  • national geophysical data center
  • noaa
  • global
  • magnetic anomalies
  • u.s. department of commerce
  • earth science
  • geographic region
  • magnetic intensity
  • doc/noaa/nesdis/ngdc
  • solid earth
  • doc/noaa/nesdis/ncei
  • geomagnetism
  • national centers for environmental information

Topics

Categories