EMAG3: NGDC'S CANDIDATE FOR THE WORLD DIGITAL MAGNETIC ANOMALY MAP
EMAG3 is a global 3-arc-minute resolution grid of the magnetic intensity anomaly at an altitude of 5 km above mean sea level. It was compiled from satellite, marine, aeromagnetic, and ground magnetic surveys. EMAG3 was chosen as the base grid for the World Digital Magnetic Anomaly Map (WDMAM) project.