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  Information - G4 Interactions between the three pillars of space geodesy: surface geometry, Earth rotation and the gravity field

Event Information
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.

Preliminary List of Solicited Speakers
Richard Gross
Tonie van Dam
Geraldine Bourda


General Statement
The information contained hereafter has been compiled and uploaded by the Session Organizers via the "Organizer Session Form". The Session Organizers have therefore the sole responsibility that this information is true and accurate at the date of publication, and the conference organizer cannot accept any legal responsibility for any errors or omissions that may be made, and he makes no warranty, expressed or implied, with regard to the material published.

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