Optimal selection of spectral channels for remote sensing of optically active matters in the ocean: application of the experimental design theory

摘要

Abstract: The mathematical theory of the experiment opticaldesign is applied for the problem of remote sensing ofoptically active matters, such as phytoplankton,dissolved organic matte, or suspended particles. Anoptical design (OD) determines the number of spectralchannels, the position in spectrum and the width ofspectral 'windows' in each channel, and distribution ofmeasurement time between the channels, with account ofshot receiver noises. The optimal designs for shipboardand satellite measurements of chlorophyll concentrationfor the case of pure atmosphere were computed on thebasis of the previously published algorithm. Forcomputing OD, arrays of 1000 random radiation spectraabove sea surface and on the upper atmosphere boundarywere simulated using improved model of upwellingradiance. These spectra were also used for retrieval ofthe chlorophyll concentration from shipboard'measurements' of color indexes and of ocean radiancein five wavelengths recommended in literature on thebasis of principal component analysis. The comparisonshows that OD provides the highest retrieval accuracyamong methods considered. The stability of computed ODwas tested by varying the sensor parameters,observation conditions, and water property models. !14