Observation of the Earth System from SpaceIn the recent years, space based observation methods have led to a subst tially improved understanding of Earth system. Geodesy and geophysics are contributing to this development by measuring the temporal and spatial va ations of the Earths shape, gravity ? eld, and magnetic ? eld, as well as at sphere density. In the frame of the GermanR&D programmeGEOTECHNO LOGIEN,researchprojectshavebeen launchedin2002relatedto the satellite missions CHAMP, GRACE
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