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- W2068506513 abstract "Inversion of radiative transfer models using a lookup-table (LUT) approach against hyperspectral data streams leads to retrievals of biophysical parameters such as chlorophyll content (Chl), but necessary optimization strategies are not consolidated yet. Here, various regularization options have been evaluated to the benefit of improved Chl retrieval from hyperspectral CHRIS data, being: i) the role of added noise, ii) the role of multiple best solutions, and iii) the role of applied cost functions in LUT-based inversion. By using data from the ESA-led field campaign SPARC (Barrax, Spain), it was found that introducing noise and opting for multiple best solutions in the inversion considerably improved retrievals. However, the widely used RMSE was not the best performing cost function. Three families of alternative cost functions were applied here: information measures, minimum contrast and M-estimates. We found that so-called ‘Power divergence measure’, ‘Trigonometric’ and spectral measure with ‘Contrast function K(x)=−log(x)+x’ outperformed RMSE. The whole inversion approach, including more than 60 different cost functions, has been implemented in the ARTMO (Automated Radiative Transfer Models Operator) GUI toolbox and can easily be applied to other kinds of multispectral or hyperspectral images." @default.
- W2068506513 created "2016-06-24" @default.
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- W2068506513 date "2012-07-01" @default.
- W2068506513 modified "2023-10-16" @default.
- W2068506513 title "Optimizing LUT-based radiative transfer model inversion for retrieval of biophysical parameters using hyperspectral data" @default.
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- W2068506513 doi "https://doi.org/10.1109/igarss.2012.6351969" @default.
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