Simulation results from combination of GOCE gridded SST and SGG data
Prof. Carl Christian Tscherning(1)
University of Copenhagen,
Juliane Maries Vej 30,
DK-2100 Copehnagen Oe,
EGM96 spherical harmonic coefficients from degree 25 to 300 has been used to
produce grids of values of the anomalous potential,. T, the radial derivative,
Tr, and various second order derivatives in an East, North, radial frame, (Trr
,Tre ,Tee, Tnn ).
Various combinations of the data has been used to recover the
potential coefficients using the method of Fast Spherical Collocation (FSC).
The simulation shows that using Tre , Tee, Tnn, Trr,
and combining Tre ,Tr, Te nearly give the same result.
That Tnn , Tee , gives the same results, but
combining Tee with Tnn improves the results slightly.
Tr , Trr and combining
Trr, Tr also gives nearly the same results, while
the results using the
"horizontal" derivatives are up to a factor 2 worse per degree.
However, the different data types "aliases" back into degrees 2-24. Here T and
Tr give the smallest aliasing.
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,