Comment on ‘Explicit, approximate expressions for the resolution anda posterioricovariance of massive tomographic systems’ by G. Nolet, R. Montelli and J. Virieux

Autor:	Z. S. Yao, Roland Roberts, A. Tryggvason
Rok vydání:	2001
Předmět:	Geophysics Geochemistry and Petrology Calculus Projection method Applied mathematics A priori and a posteriori Model parameters Inversion (meteorology) Covariance Mathematics
Zdroj:	Geophysical Journal International. 145:307-314
ISSN:	1365-246X 0956-540X
DOI:	10.1111/j.1365-246x.2001.00346.x
Popis:	Summary When solving tomographic inversion problems, the resolution matrix for the equation system can provide very useful information on how well the model parameters can be resolved. Recently, Nolet et al. (1999)—referred to as NMV hereafter—proposed a one-step projection method to estimate the resolution matrix for massive tomographic problems. It was claimed by NMV that the approximations inherent in the one-step approach are of limited significance. We point out some of the problems associated with these approximations, and question whether the issue of the level of approximation has in practice been sufficiently addressed. We also suggest a modified approach that avoids some of the possible problems.
Databáze:	OpenAIRE
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