Relationship between apparent optical properties and photosynthetic pigments in the sub-alpine Lake Iseo

Autor: Cardoso, A.C., Chiaudani, G., Pepe, M., Premazzi, G., Zilioli, E., Giardino, C., Rodari, E., Borsani, G.
Předmět:
Zdroj: Science of the Total Environment. Mar2001, Vol. 268 Issue 1-3, p31. 0p.
Abstrakt: Some bio-physical parameters, such as chlorophyll a concentration, Secchi disk depth and water surface temperature were mapped in the sub-alpine Lake Iseo (Italy) using Landsat Thematic Mapper (TM) data acquired on the 7 March 1997. In order to adequately investigate the water-leaving radiance, TM data were atmospherically corrected using a partially image-based method, and the atmospheric transmittance was measured in synchrony with the satellite passage. An empirical approachof relating atmospherically corrected TM spectral reflectance valuesto in situ measurements, collected during the satellite data acquisition, was used. The models developed were used to map the chlorophyllconcentration and Secchi disk depth throughout the lake. Both modelsgave high determination coefficients (R2=0.99 for chlorophyll and R2=0.85 for the Secchi disk) and the spatial distribution of chlorophyll concentration and Secchi disk depth was mapped with contour intervals of 1 mg/m3 and 1 m, respectively.A scene-independent procedure was used to derive the surface temperature of the lake from the TM data with a root mean square error of 0.3 deg. C. [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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