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Proceedings Paper

A method of channel compression for the trace gas remote sounder by using the empirical orthogonal functions
Author(s): Tadao Aoki
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Paper Abstract

A method has recently been developed to compress the number of channels of trace gas remote sounder preserving almost all the information content that the original data has1. In this method, the weighting function of the original channels is expanded with empirical orthogonal functions (EOFs), and a set of hypothetical radiances, whose weighting functions are the EOFs, are used for the analysis. It has been shown that the radiance data of 240 of original channels of CO2 spectrum at around 6207 cm-1 can be compressed to about 3 channels of hypothetical radiances with loosing negligible information content. This means that the information content of the vertical profile of trace gas, which the spectrum of the reflected solar radiation has, is not so much. In the present paper, the information content of the vertical profile is examined for typical two types of spectra of CO2 and CH4 absorption bands at around 1.6 and 2.1 μ regions. Another issue of this paper is the correlation between the "measurement error" of the hypothetical channels. Since the hypothetical radiance is generated by the linear combination of radiances of the original channels, it could have the correlation between the radiance errors in hypothetical channels. It is shown that the crrelation rapidly decreases with the decrease of the range of the data that generates the EOFs.

Paper Details

Date Published: 20 January 2005
PDF: 14 pages
Proc. SPIE 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II, (20 January 2005); doi: 10.1117/12.577978
Show Author Affiliations
Tadao Aoki, National Institute for Environmental Studies (United States)

Published in SPIE Proceedings Vol. 5655:
Multispectral and Hyperspectral Remote Sensing Instruments and Applications II
Allen M. Larar; Makoto Suzuki; Qingxi Tong, Editor(s)

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