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Post‐processing removal of correlated errors in GRACE data
Author(s) -
Swenson Sean,
Wahr John
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025285
Subject(s) - smoothing , geodesy , filter (signal processing) , surface gravity , satellite , geology , signature (topology) , radius , data processing , remote sensing , geophysics , physics , computer science , statistics , mathematics , spectral line , astronomy , geometry , computer security , computer vision , operating system
Gravity fields produced by the Gravity Recovery and Climate Experiment (GRACE) satellite mission require smoothing to reduce the effects of errors present in short wavelength components. As the smoothing radius decreases, these errors manifest themselves in maps of surface mass variability as long, linear features generally oriented north to south (i.e., stripes). The presence of stripes implies correlations in the gravity field coefficients. Here we examine the spectral signature of these correlated errors, and present a method to remove them. Finally, we apply the filter to a model of surface‐mass variability to show that the filter has relatively little degradation of the underlying geophysical signals we seek to recover.