By D. Angermann, H. Drewes, M. Gerstl, R. Kelm, M. Krügel, B. Meisel (auth.), Prof. Dr. Fernando Sansò (eds.)
Every 4 years the foreign organization of Geodesy meets on the IUGG basic meeting and this has continually been a major occasion for IAG to make the purpose on the place are we going as geodesists either when it comes to clinical construction in addition to when it comes to association. The court cases of IAG on the Sapporo 2003 common meeting are the reflect of our clinical achievements, and, as Geodesy is a residing entity like several different technological know-how, lets say it's a approach to see the image of what we reflect on our box of functions in addition to of theoretical speculations. allow us to research this element by way of what are: the item of our examine, the equipment we use, the overall medical effects we will produce. • Our item: the following i want to exploit a pseudo-Helmert definition; the article of Geodesy is understanding the surfaces of the earth: the geometric floor by way of positioning and e.m. surveying, and the actual floor, i.e the gravity box, through land, marine or satellite tv for pc gravimetry, and their time diversifications. This "object" is of course interlaced with different actual houses of the earth either via deep methods affecting its floor and during the gravity box in any respect various scales from the worldwide to the nearby and native, the place such a lot engineering functions take place.
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Additional resources for A Window on the Future of Geodesy: Proceedings of the International Association of Geodesy IAG General Assembly Sapporo, Japan June 30 – July 11, 2003
These include computational artefacts, periodic systematic errors in satellite orbits, signal path delay variations, and geophysical causes like loading and postglacial rebound. We discuss possible reasons, their significance, and their consequences on high-precision GPS observations. g. time series from the superconducting gravimeter, are also discussed. the land uplift rate, we had to take the variation into account. In the worst case it could lead to poor results or even misinterpretation, as demonstrated in Fig.
We need data from other sources, like air pressure and tide gauge observations, to compute the actual loading on site. A superconducting gravimeter will give an independent constraint to the vertical motion. This concept is compatible with the IGGOS and ECGN proposals to establish multiinstrument reference networks (Ihde, 2003, Rummel et al, 2001). In the Nordic countries a similar proposal for a NGGOS (Nordic Geodetic and Geodynamic Observing System) has been developed (Poutanen et al, 2003). New applications, like precise point positioning technique or meteorological applications to estimate the tropospheric water vapour content require even sub-cm accuracy in the satellite range measurements.
Globally the scale change is quite small and there is only a minor trend (top). 8 ppb/yr (middle). Six North European stations show much smaller trend (bottom). This indicates that the effect of the postglacial rebound in the GPS network scale is visible. 5 Additional observations In Fig. 10 we show an example of detecting atmospheric loading using GPS. There are two phenomena which are not separable in GPS data if no additional information is available. First, the changing air mass and humidity causes a change in the tropospheric path delay, and secondly, the crust is displaced by varying loading.