The first edition of The Magnetic Anomaly Map of the World, formerly named World Digital Magnetic Anomaly Map (WDMAM), was made public at the 24th IUGG General Assembly in July, 2007. The compilation of the map was conducted jointly by IAGA and CGMW with the support of UNESCO, and the map was published by the UNESCO and the CGMW. The crustal magnetic field anomaly data were obtained from airborne survey, shipborne survey and satellite acquisition all over the world in a period of more than 50 years. The data merged into a composite 5 km×5 km grid and a nominal height above geoid of 5 km. The publication of the WDMAM will give an impetus to researches on the geological structure of the crust and the uppermost lithosphere, and is conducive to resource exploration. The second edition of the WDMAM is now under compilation.
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