The Earth's gravity field serves on the one hand as the reference surface for a large number of dynamic processes of System Earth, on the other hand allows the measurement of the gravity field itself and its temporal variations the determination of mass distribution and mass transport. The gravity field is therefore an important parameter in geodesy, geophysics, oceanography and navigation. Hence, one of the main tasks of the CGE is the observation, modeling and determination of the mean and time-variable gravity field - globally and regionally - at different spatial and temporal resolutions. In part, these quantities are also required by, and input to, other Research Themes.
One of the key elements in the determination of the Earth's gravity field is a profound understanding of the theory and application of the different sensors to measure the gravity field. This includes satellite based observing systems as well as airborne, shipborne and terrestrial gravimetry.The theoretical foundations of the application of the different measurements have to be further developed such that todays highly accurate measurements can be used in a consistent and rigorous way. To this aim, global and regional analysis tools are to be developed further to allow the computation of gravity field models with spatial and temporal resolutions that are a function of the available data only. Application strategies are to be developed together with potential users of global and regional models to advocate the potential of gravity field modeling in earth system research.