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Covariance propagation for GOCE? Some thoughts and questions

Gernot Plank(1), Roger Haagmans(1,1) and Michael Kern(1,1)

(1) ESA, Keplerlaan 1, 2200 AG Noordwijk, Netherlands


The full covariance propagation for GOCE is a challenging and numerically demanding task. Taking the full variance covariance matrix of the spherical harmonic coefficients as provided by the HPF as input, the user community (e.g. oceanographers) need a statistical error representation of derived quantities (e.g. geoid heights, geoid slopes, ...) on a global or regional area. Not only the error variances but also the covariances between all points are needed as input for the further incorporation of the data into the modelling of e.g. ocean currents. The presentation aims at the question whether for some applications an approximate covariance propagation is sufficient in terms of accuracy. By applying such methods the calculation time could be reduced significantly, and the hardware requirements can be minimised. However, the choice of any approximate method relies on the requirements of the specific use for given applications.


Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry