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Testing available MERIS image processors for lakes.

Krista Alikas(1), Anu Reinart(1), Evi Lill(2) and Kristi Valdmets(1)

(1) Tartu Observatory, Toravere, Tartumaa, 61602, Estonia
(2) Centre for Limnology, Rannu, 61117, Estonia

Abstract

Various processing algorithms for MERIS data are developed for applications in monitoring optically complex inland waters. In the present study, MERIS level 2 standard products and results by different processors developed specially for lakes were compared with in situ data from optically very different North European large lakes (L. Peipsi, L.Võrtsjärv, L. Vänern, L. Vättern). All these waterbodies have similar geographic location (59-61° N) but very variable optical properties: starting from very clear water in Vättern to almost eutrophic Peipsi. In lakes water optical properties are influenced by bloom of various species of phytoplankton, total suspended matter originating from the shallow bottom, and high amount of colored dissolved organic matter carried into lakes by rivers. Stand-alone processors and BEAM plug-ins for MERIS data such as C2R, Finlakes, Spanish lakes, were used to derive optical properties and concentrations of water constituents from level 1b TOA radiances over these complex Case II waters. In addition, data derived by FUB/WeW WATER processor were used. In this study, we present the results of the testing campaigns and comment on the applicability of the existing algorithms for the processing of data over the North European lakes.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry