Intelligent information extraction from reflectance spectra Absorption band positions

Details Intelligent information extraction from reflectance spectra Absorption band positions Intelligent information extraction from reflectance spectra Absorption band positions

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.9585h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Aug. 10, 1986, p. 9585-9598.

Physics

5

Absorption Spectra, Reflected Waves, Remote Sensing, Signature Analysis, Spectral Bands, Spectrum Analysis, Algorithms, Pattern Recognition

Scientific paper

A multiple high-order derivative analysis algorithm has been developed which can automatically extract absorption band positions from low-quality reflectance spectra with little degredation of accuracy. Overlapping bands with comparable widths and intensities can be resolved whose centers are as close as 0.3-0.5 W, with safer resolution limits of 0.6-1.0 W band center separations suggested for overlapping bands that are dissimilar. The segment length for smoothing is continually adjusted to about 0.5 W to minimize signal distortion, and a spectral pattern recognition algorithm predicts the signal spectrum and calculates approximate W across the spectrum using its second derivative. A single-pass cubic spline is applied to the smoothed data, and a sliding segment sixth-order polynomial is fit to the spectrum, with the length of the segment being continuously locally adjusted to 1.0 W across the spectrum. Good reliability and consistency of the algorithm is demonstrated with application to laboratory and earth-based telescope spectra.

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