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Proceedings Paper

Remote sensing of coastal water quality
Author(s): Kai Sorensen; Eyvind Aas
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Paper Abstract

In the turbid and yellow substance rich waters of the outer Oslofjord the turbidity and the Secchi disk depth have been successfully determined by remote sensing, with the TM channels of Landsat 5. Similar attempts to determine the total suspended matter and the beam attenuation coefficient at 520 nm have been less successful, and the content of chlorophyll- (alpha) is the most difficult to estimate, if at all possible with this sensor. Observations in the green and red parts of the spectrum give the best correlation. The method requires that a few field measurements and samples are taken, and the constants of the algorithms will vary from case to case. These results and the possible causes of the variation are discussed. Established optical theory for the backscattering of light from the sea to the atmosphere is tested by optical measurements. The results indicate that the ratio between the radiance from nadir in the sea and the downward irradiance may have a significant variation in these coastal waters that we so far are not able to predict.

Paper Details

Date Published: 26 October 1994
PDF: 10 pages
Proc. SPIE 2258, Ocean Optics XII, (26 October 1994); doi: 10.1117/12.190076
Show Author Affiliations
Kai Sorensen, Norwegian Institute for Water Research (Norway)
Eyvind Aas, Univ. of Oslo (Norway)


Published in SPIE Proceedings Vol. 2258:
Ocean Optics XII
Jules S. Jaffe, Editor(s)

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