Papers by Michel Sarrailh
The database of the International Gravimetric Bureau
We present the database of the International Gravimetric Bureau which is hosting more than 12 mil... more We present the database of the International Gravimetric Bureau which is hosting more than 12 millions of gravity data points (continents and oceans, airborne data), how to use it, and how to provide data to it.
International Association of Geodesy Symposia, 2008
The European Gravity and Geoid Project (EGGP) is a project within IAG Commission 2, reporting to ... more The European Gravity and Geoid Project (EGGP) is a project within IAG Commission 2, reporting to Sub-commission 2.4. The main goal of the project is to compute an improved European geoid and quasigeoid model based on new and improved data sets which have become available since the last computation in 1997 (EGG97). The improvements include better global geopotential models from the CHAMP and GRACE missions, better digital elevation models (DEMs) in some regions (e.g., new national DEMs, SRTM3, GTOPO30), updated gravity data sets for selected areas, updated ship and altimetric gravity data, improved procedures for the merging of ship and altimetric data, the use of GPS/levelling data, as well as refined computation techniques. This contribution describes the progress made during the 4-year term from 2003 -2007, including the development of a new geoid and quasigeoid model EGG07 for entire Europe. First, the status of the gravity and terrain data sets as well as the development of the EGG07 model by the spectral combination approach is described. Then, the EGG07 and other models are evaluated by independent GPS and levelling data, showing that the use of GRACE geopotential models as well as upgraded gravity and terrain data leads to significant improvements compared to EGG97 (in total by 25 % -65 %). The results indicate an accuracy potential of the EGG07 model in the order of 0.03 -0.05 m at continental scales and 0.01 -0.02 m over shorter distances up to a few 100 km, provided that high quality and resolution input data are available.
Les palestiniens de l'intérieur, sous la direction de Camille Mansour
We summarize the current knowledge about the adjustment of gravimetric networks in terms of the p... more We summarize the current knowledge about the adjustment of gravimetric networks in terms of the pseudo-inverse theory of least-squares processes, and give the link with the so-called free adjustment often used in practice. This is the case when some data points on the network are frozen, i.e. if we suppose that the corresponding gravimetric values are perfectly known on these points.
Ajustement des réseaux gravimétriques
We summarize the current knowledge about the adjustment of gravimetric networks in terms of the p... more We summarize the current knowledge about the adjustment of gravimetric networks in terms of the pseudo-inverse theory of least-squares processes, and give the link with the so-called free adjustment often used in practice.
Adjustment of gravimetric networks
We summarize the current knowledge about the adjustment of gravimetric networks in terms of the p... more We summarize the current knowledge about the adjustment of gravimetric networks in terms of the pseudo-inverse theory of least-squares processes, and give the link with the so-called free adjustment often used in practice.
On board evaluation of the STAR accelerometer
First CHAMP Mission …, 2003
... Richard Biancale1, Sylvain Loyer2, Jean-Michel Lemoine1, Alain Ferret1, Pierre Touboul3, Bern... more ... Richard Biancale1, Sylvain Loyer2, Jean-Michel Lemoine1, Alain Ferret1, Pierre Touboul3, Bernard Foulon3, Gregory Pradels3, Ludwig Grunwald4, Thierry Fayard1, Nicole Vales1, Michel ... Radial)-2 Iff7 ms-2 fC/day " X3"(shadow) up to 3 10" 5 ms" 2 Peaks" heater switching" 5 ...
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Papers by Michel Sarrailh