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Information - G4 Interactions between the three pillars of space geodesy: surface geometry, Earth rotation and the gravity field
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Event Information |
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At the IAG Scientific Assembly in Cairns in Summer 2005 the Global Geodetic Observing
System (GGOS), a project of the IAG entered its operational phase.
One of the goals of GGOS is the integration of the three pillars of geodesy,
namely the Earth's shape (including the oceans), Earth rotation and
the Earth's gravity field, as well as their temporal variations. The topic of this
session are all the relationships and interactions between these three pillars.
Contributions are welcome from purely theoretical and/or modelling considerations to
observational evidence of the relationships derived from the space geodetic
techniques including VLBI, SLR, DORIS, GNSS, the altimetry and gravity missions, and
data on the global geophysical fluids. We also encourage contributions showing results
based on a combined and consistent estimation of parameters from all three pillars.
The consistent modelling of all three (or at least two of the three) pillars in a physical
sense and the setup of common standards for the geometrical as well as the gravimetrical
component, should also be considered in such an integration process and belong to
the scope of this session.
Examples of interesting relationships are, e.g., reference frame origin and orientation,
the low-degree gravity field coefficients (C01, S11, C11, S21, C21, and S22), and the
position and orientation of the Earth's figure and rotation axes; loading effects seen as
surface deformation, gravity field changes and Earth rotation variations; global mass transport,
conservation of mass and angular momentum; connections between "wind" and "matter" terms derived
from Earth rotation, gravity field variations and surface deformation; variations in polar
motion and length of day related to changes of the changes of the Earth's inertia
tensor and J2 (e.g., from SLR or CHAMP/GRACE); etc.
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