| Summary: | The polar regions with their unique geophysical and geodynamic environment are characterized by close interactions between solid earth, cryosphere, hydrosphere and athmosphere. They are directly linked to the global climate system. Geodetic and geophysical observations play an essential role in the scientific investigation of the polar regions, especially with regard to permanent and temporary observatories. For several years geodetic observatories have been realized in Antarctica by continuous or periodic data acquisitions. The observation techniques include: Global Navigation Satellite Systems (GNSS, in particular GPS and GLONASS, in futre also GALILEO); further geodetic space techniques (DORIS, VLBI); tide gauges observations; absolute, tidal and relative gravimetry; seismology; geomagnetometry; meteorology.Within the Scientific Commettee on Antarctic Research (SCAR) the SCAR group of experts on Geodetic Infrastructure of Antarctica (GIANT) spent great effort to coordinate the international activities and to enhance the development of geodetic and geophysical observatories.In order to gain a better understanding of the polar environment long time series as recorded by permanent observatories should be integrated together with data acquired by field surveys like geological and glaciological sampling, geophysical investigations, and with satellite data (remote sensing, satellite gravimetry).Focussed on the geodetic-geodynamic aspects of the IPY project "Polar Earth Observing Network" (POLENET, IPY full proposal no. 185) special attention should be given to regional and global model generation and validation (regional geodynamics, plate tectonics, postglacial rebound, global climate system, global change).Special sessions at international symposia have been dedicated to Antarctic geodetic and geophysical observations and data analysis; among others we would like to mention Session G10 “Short and long-term observations in polar region” - EGU06, Vienna, April 2006; and the International Workshop “ GPS in the IPY: ...
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