期刊
SENSORS
卷 8, 期 8, 页码 4582-4599出版社
MDPI
DOI: 10.3390/s8084582
关键词
remote sensing; inland water; chlorophyl1; monitoring; operationalization
资金
- Swiss National Science Foundation [200020-112626/1]
- Institute for Lake Research ( IfS) Langenargen of LuBW
- German Aerospace Center ( DLR) Oberpfaffenhofen
- ESA [20436/07/I-LG]
A physically based algorithm is used for automatic processing of MERIS level 1B full resolution data. The algorithm is originally used with input variables for optimization with different sensors (i.e. channel recalibration and weighting), aquatic regions ( i.e. specific inherent optical properties) or atmospheric conditions ( i.e. aerosol models). For operational use, however, a lake-specific parameterization is required, representing an approximation of the spatio-temporal variation in atmospheric and hydro-optic conditions, and accounting for sensor properties. The algorithm performs atmospheric correction with a LUT for at-sensor radiance, and a downhill simplex inversion of chl-a, sm and y from subsurface irradiance reflectance. These outputs are enhanced by a selective filter, which makes use of the retrieval residuals. Regular chl-a sampling measurements by the Lake's protection authority coinciding with MERIS acquisitions were used for parameterization, training and validation.
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