gov.noaa.ngdc.mgg.geophysical_models:EMAG220090807A 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.Magnetic anomaly maps provide insight into the subsurface structure and composition of the Earth's crust. Over continental areas, magnetic anomalies illuminate geologic, tectonic, and geothermal evolution of crust and lithosphere. In the world's oceans, anomalies trending parallel to the isochrons (lines of equal age) reveal the temporal evolution of oceanic crust. Magnetic maps are widely used in the geological sciences and in resource exploration.1946010120081201UnknownCompleteasNeeded-18018090-90NASA/GCMD Science KeywordsEARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic FieldEARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic IntensityEARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic AnomaliesNASA/GCMD Location KeywordsGeographic Region > GlobalNoneUse Limitation: Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.; Use Limitation: 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.; Use Limitation: 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.; DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of CommerceStefan Mausphysical and mailing 303-497-6522Stefan.Maus@noaa.govUnknown 20130617Brian MeyerDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commercemailing and physical303-497-6125Brian.Meyer@noaa.govContent Standard for Digital Geospatial Metadata: Extensions for Remote Sensing MetadataFGDC-STD-012-2002