Publications des scientifiques de l'IRD

Wattelez G., Dupouy Cécile, Mangeas Morgan, Lefevre Jérôme, Touraivane, Frouin R. (2016). A statistical algorithm for estimating chlorophyll concentration in the New Caledonian lagoon. Remote Sensing, 8 (1), p. art. 45 [23 p.]. ISSN 2072-4292.

Titre du document
A statistical algorithm for estimating chlorophyll concentration in the New Caledonian lagoon
Année de publication
2016
Type de document
Article référencé dans le Web of Science WOS:000369494500026
Auteurs
Wattelez G., Dupouy Cécile, Mangeas Morgan, Lefevre Jérôme, Touraivane, Frouin R.
Source
Remote Sensing, 2016, 8 (1), p. art. 45 [23 p.] ISSN 2072-4292
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.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Ecologie, systèmes aquatiques [036] ; Télédétection [126]
Description Géographique
NOUVELLE CALEDONIE ; PACIFIQUE
Localisation
Fonds IRD [F B010066220]
Identifiant IRD
fdi:010066220
Contact