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Observation of the Earth System from Space (Paperback, Softcover reprint of hardcover 1st ed. 2006)
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Observation of the Earth System from Space (Paperback, Softcover reprint of hardcover 1st ed. 2006)
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In 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 Earth's 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 and ESA's planned mission GOCE, to comp-
mentary terrestrial and airborne sensor systems and to consistent
and stable high-precision global reference systems for satellite
and other techniques. In the initial 3-year phase of the research
programme (2002-2004), new gravity ?eld models have been computed
from CHAMP and GRACE data which outperform previous models in
accuracy by up to two orders of m- nitude for the long and medium
wavelengths. A special highlight is the - termination of seasonal
gravity variations caused by changes in continental water masses.
For GOCE, to be launched in 2006, new gravity ?eld analysis methods
are under development and integrated into the ESA processing s-
tem. 200,000 GPS radio occultation pro?les, observed by CHAMP, have
been processed on an operational basis. They represent new and
excellent inf- mation on atmospheric refractivity, temperature and
water vapor. These new developments require geodetic space
techniques (such as VLBI, SLR, LLR, GPS) to be combined and
synchronized as if being one global instrument.
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