Open AccessImproved smoothing of an altimetric ocean‐tide model with global Proudman functions
Author(s) -
Ray R. D.,
Sanchez B. V.
Publication year - 1994
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1994.tb04000.x
Subject(s) - altimeter , smoothing , geodesy , ridge , geology , ocean tide , least squares function approximation , data set , mathematics , statistics , paleontology , estimator
SUMMARY A set of global Proudman functions, computed on a 2° finite‐difference grid, is used to smooth raw tidal estimates previously derived by Cartwright and Ray from a two‐year analysis of Geosat altimeter data. The least‐squares problem provides an interesting application of ridge regression and Hansen's L‐curve analysis. The final smoothed maps are found to agree more closely to a set of 80‘ground‐truth’constants than did the original tidal models.