A method has recently been shown by Aoki to compress the number of channels of vertical atmospheric sounder preserving almost all the information content that the original data has. In this method the weighting function of the original channels is decomposed with empirical orthogonal functions (EOFs) and a system of hypothetical radiances, whose weighting functions are the EOFs, are constructed and used for the analysis. It has been shown that the radiance data of 1200 of original channels, which is obtained from the region 640-760 cm^-1, can be compressed to 23 or less channels of hypothetical radiances with loosing negligible information content. In the present paper, the studies were performed on the a) the relation between the number of the EOFs that is required to reconstruct the weighting functions in sufficient accuracy and the spectral resolution, b) the dependence of the correlation between "measurement error" of hypothetical channels on the range of zenith angle of sample data of weighting function, from which the EOFs are generated, and c) the dependence of the information content on the spectral resolutions 0.1, 0.35 and 0.6 cm^-1.

Date Published: 5 January 2005
PDF: 8 pages
Proc. SPIE 5658, Applications with Weather Satellites II, (5 January 2005); doi: 10.1117/12.577962

Published in SPIE Proceedings Vol. 5658:
Applications with Weather Satellites II
W. Paul Menzel; Toshiki Iwasaki, Editor(s)