Users assume responsibility to determine the usability of these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. Access & Use ConstraintsÄistribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. The longest wavelengths (>300 km) were replaced with the latests satellite lithosphere magnetic field model, MF7. Interpolation between sparse track lines in the oceans was improved by using a kriging algorithm, which specializes in heterogeneous data distribution gridding, in order to create a compilation as true to the observed data as possible, and avoid using a priori information. Wherever available, the original shipborne and airborne data were used instead of precompiled oceanic magnetic grids. New additions grid and track line data have been included, both over land and the oceans. The resolution remains 2 arc-minutes, and the altitude of 4 km above the geoid is still supported, but an additional product, a grid that is observed at sea-level over oceanic regions, has been produced. It is a significant update of the previous release of the Earth Magnetic Anomaly Grid. EMAG2v3 is a global Earth Magnetic Anomaly Grid compiled from satellite, ship, and airborne magnetic measurements.
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