EGU General Assembly 2008

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	Quick Search Author Title Abstract Nr. Schedule Nr. Programme Groups Union Symposia Interdivision Sessions Educational Symposia Atmospheric Sciences Biogeosciences Climate: Past, Present, Future Cryospheric Sciences Earth & Space Science Informatics Energy, Resources & the Environment Geochemistry, Mineralogy, Petrology & Volcanology Geodesy Geodynamics Geomorphology Geosciences Instrumentation & Data Systems Hydrological Sciences Isotopes in Geosciences: Instrumentation and Applications Magnetism, Palaeomagnetism, Rock Physics & Geomaterials Natural Hazards Nonlinear Processes in Geophysics Ocean Sciences Planetary & Solar System Sciences Seismology Soil System Sciences Solar-Terrestrial Sciences Stratigraphy, Sedimentology & Palaeontology Tectonics & Structural Geology Medal Lectures Great Debates in Geosciences Short Courses Keynote Lectures Townhall Meetings Division Business Meetings Editorial Board Meetings Union Meetings Splinter Meetings   Information - G4 The impact of technique errors on reference frame accuracy and stability Event Information Experiences with the 2005 version of the International Terrestrial Reference Frame (ITRF2005) have underscored once again significant differences among the contributing observing techniques and their importance in limiting the accuracy and stability of the combined frame. Those differences related to variations in intrinsic sensitivity to certain parameters (such as the Earth's geocenter) enable the ITRF to have the potential of improved accuracy over any single technique. However, other differences, such as related to choices in analysis models, can degrade the global combination. Systematic errors in techniques, both of known and unknown causes, also degrade the ITRF accuracy and can lead to long-term instabilities and other weaknesses. Given the current high precisions achieved by all the space geodetic observing methods, it is vital to improve our understanding of the specific errors of each and their effects on ITRF. All potential error types must be considered including differences in data modeling. It is equally important to develop techniques to mitigate error effects whenever possible. As always, it continues to be critically important to understand the physical relationships between the reference points of co-located systems at a highly detailed and accurate level, the so-called "site tie problem". While much has been said about this topic, the progress for ITRF realizations has been disappointing and this continues to be a limiting error in the overall combination. Contributed papers in all aspects of these inter-connected problems are requested. Work that illuminates characteristics of individual techniques or their combinations is sought. Approaches that either attenuate technique-specific errors or help understand their causes are especially needed. Preliminary List of Solicited Speakers Bill Petrachenko, Sarah Boeckmann, Pierguido Sarti, Cecilia Sciarretta, Manuel Hernandez-Pajares, Ken Senior, Pascal Willis, Gerard Petit & Brian Luzum, Xavier Collilieux, Martin Lidberg, Richard Biancale, Frank Lemoine Co-Sponsorship 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. Back to Session Programme

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