Alternate Views: Get Data, FAQ, ISO Rubric, CSW, HTML, Components, XML EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution) 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. Get the Data Access Format(s) Distributor(s) / Contact Info Instructions / 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 Fees None Use Limitation 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. Legal Constraints