Simultaneous Determination of Water Constituent Concentrations and Partial Least Squares |
Allan Aasbjerg Nielsen
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| Abstract | This paper deals with a physically based bio-optical model for the imultaneous determination of concentrations of water constituents chlorophyll-a (CHL), total suspended matter (TSM), and coloured, dissolved organic matter (CDOM). The model is based on the dependency of absorption and backscatter coefficients on the constituent concentrations. A fundamental remote sensing equation is rewritten to a regression model which is used to estimate the concentrations of CHL and TSM. A weighted regression analysis is performed and the weights are determined as the weights chosen in a partial least squares (PLS) or canonical covariance analysis of in situ measurements of CHL, TSM and CDOM with in situ spectra in the 400-730 nm region. Resampled weights are used with geometrically corrected and calibrated airborne optical casi data to produce maps of jointly estimated CHL and TSM contents. Also, considerations to give a better understanding of the PLS technique than offered by the NIPALS algorithm are given and canonical correlations analysis is briefly described. |
| Type | Conference paper [With referee] |
| Conference | 7th Scandinavian Symposium on Chemometrics |
| Year | 2001 Month August |
| Address | Copenhagen, Denmark |
| Series | Technical University of Denmark |
| Electronic version(s) | [pdf] [zip] |
| BibTeX data | [bibtex] |
| IMM Group(s) | Image Analysis & Computer Graphics |