World Digital Magnetic Anomaly Map: a combination of continental, oceanic and satellite information (Invited)

The main task in the compilation of the first edition (2007) of World Digital Magnetic Anomaly Map (WDMAM) was to find access to as many appropriate sets of continental data as possible. In the second edition (2011) Oceanic data sets will be carefully reduced in addition of improving the quality of continental data. Both maps are normalized by CHAMP-satellite anomaly models. The third edition (eventually 2015) will use SWARM-satellite gradiometry to tie near ground measurements together and assist in filling gaps between surveys. A scientific issue to be resolved for future compilations of WDMAM is to understand reasons of differences between satellite magnetic and near ground information at long wavelength part of Terrestrial anomalies.