| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
A Statistical Algorithm for Estimating Chlorophyll Concentration in the New Caledonian Lagoon
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| Autores: |
Wattelez, Guillaume
Dupouy, Cecile
Mangeas, Morgan
Lefevre, Jerome
Touraivane,
Frouin, Robert
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| Data: |
2016-01
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| Ano: |
2016
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| Palavras-chave: |
Chlorophyll-a concentration
MODerate resolution Imaging Spectroradiometer (MODIS)
Ocean color
Remote sensing
Statistical algorithm
Oligotrophic waters
New Caledonia
Coral lagoon
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| Resumo: |
Spatial and temporal dynamics of phytoplankton biomass and water turbidity can provide crucial information about the function, health and vulnerability of lagoon ecosystems (coral reefs, sea grasses, etc.). A statistical algorithm is proposed to estimate chlorophyll-a concentration ([chl-a]) in optically complex waters of the New Caledonian lagoon from MODIS-derived remote-sensing reflectance (R-rs). The algorithm is developed via supervised learning on match-ups gathered from 2002 to 2010. The best performance is obtained by combining two models, selected according to the ratio of R-rs in spectral bands centered on 488 and 555 nm: a log-linear model for low [chl-a] (AFLC) and a support vector machine (SVM) model or a classic model (OC3) for high [chl-a]. The log-linear model is developed based on SVM regression analysis. This approach outperforms the classical OC3 approach, especially in shallow waters, with a root mean squared error 30% lower. The proposed algorithm enables more accurate assessments of [chl-a] and its variability in this typical oligo- to meso-trophic tropical lagoon, from shallow coastal waters and nearby reefs to deeper waters and in the open ocean.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00481/59309/62060.pdf
DOI:10.3390/rs8010045
https://archimer.ifremer.fr/doc/00481/59309/
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| Editor: |
Mdpi Ag
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| Formato: |
application/pdf
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| Fonte: |
Remote Sensing (2072-4292) (Mdpi Ag), 2016-01 , Vol. 8 , N. 1 , P. 45 (23p.)
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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