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Proceedings Paper

Remote sensing algorithms for lakes Vattern and Vanern, Sweden, based on the SeaWiFS and MERIS bands
Author(s): Donald C. Pierson; Niklas Stroembeck
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Paper Abstract

Through a combination of modeling and field work, we have investigated the possibilities of developing algorithms for the SeaWiFS and MERIS sensors which estimate the concentrations of chlorophyl a and phaeophytin a, dissolved yellow substances, and suspended particulate inorganic material in the upper water layer of Lakes Vaettern, and Vaenern the two largest lakes in Sweden. These concentrations are linked to the absorption and backscattering coefficients through a series of empirical relationships and ultimately radiance reflectance is estimated as a function of the ratio of backscattering to absorption. Model parameterization, i.e. the development of the empirical relationships linking the optically active substances to the inherent optical properties is based on both in situ measurements, and laboratory analyses specific to each lake. The frequency distributions of the optically active concentrations in each lake were estimated form long term monitoring data collected by the Swedish Environmental Protection Agency. Simulations which randomly varied the optically active substances based on their frequency distributions were used to generate synthetic data sets which could be used to examine possible remote sensing algorithms. The results of our modeling, suggest that both SeaWiFS and MERIS can provide useful estimates of yellow substances and SPIM in these two lakes. Accurate estimates of chlorophyll depend on measurements of radiance reflectance in the 660nm-680nm chlorophyll absorption band, in order to minimize interference from yellow substance absorption. As a result only the MERIS band 9: band 7 ratio was able to provide useful estimates of chlorophyll concentrations, and the accuracy of these estimates was influenced by variations in yellow substance absorption and variations in the shape of yellow substance absorption spectra measured in each lake.

Paper Details

Date Published: 22 December 2000
PDF: 12 pages
Proc. SPIE 4172, Remote Sensing of the Ocean and Sea Ice 2000, (22 December 2000); doi: 10.1117/12.411696
Show Author Affiliations
Donald C. Pierson, Uppsala Univ. (Sweden)
Niklas Stroembeck, Uppsala Univ. (Sweden)


Published in SPIE Proceedings Vol. 4172:
Remote Sensing of the Ocean and Sea Ice 2000
Charles R. Bostater; Rosalia Santoleri, Editor(s)

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