eesti teaduste
akadeemia kirjastus
Estonian Journal of Ecology
Variability of optical water types in Lake Peipsi; 33–46

Anu Reinart, Kristi Valdmets
Lake Peipsi is a large freshwater lake that needs regular and careful monitoring. Remote sensing could be a powerful tool for this purpose; however, the standard ocean colour products often fail over optically complex waters. A three-year intensive study of optically active sub­stances and reflectance was carried out in L. Peipsi. We determined that the lake’s water most commonly belonged into Moderate (65%) type, followed by Turbid (16%) and Clear (9%) types; only 5% of the samples were classified into Very turbid and Brown types. Because water types vary in time and space, there is a need for a comprehensive approach to the optical classification of water types, which could automatically be applied to satellite image. Despite the differences in optically active substances, reflectance spectra in Moderate and Turbid types cannot be distinguished by the standard processing scheme of the MODIS sensor because of its lack of suitable bands.
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