Publications des scientifiques de l'IRD

Wattelez G., Dupouy Cécile, Mangeas Morgan, Lefèvre Jérôme, Touraivane T., Frouin R. (2014). A statistical algorithm for estimating chlorophyll concentration from MODIS data. In : Frouin R.J. (ed.), Pan D. (ed.), Murakami H. (ed.). Ocean remote sensing and monitoring from space. Bellingham WA : SPIE, 9261, 92611S/1-92611S/15. (Proceedings of SPIE ; 92611S). SPIE Remote Sensing Conference, Pékin (CHN), 2014/10/13. ISSN 0277-786X.

Titre du document
A statistical algorithm for estimating chlorophyll concentration from MODIS data
Année de publication
2014
Type de document
Partie d'ouvrage
Auteurs
Wattelez G., Dupouy Cécile, Mangeas Morgan, Lefèvre Jérôme, Touraivane T., Frouin R.
In
Frouin R.J. (ed.), Pan D. (ed.), Murakami H. (ed.), Ocean remote sensing and monitoring from space
Source
Bellingham WA : SPIE, 2014, 92611S/1-92611S/15 (Proceedings of SPIE ; 92611S). ISSN 0277-786X
Colloque
SPIE Remote Sensing Conference, Pékin (CHN), 2014/10/13
We propose a statistical algorithm to assess chlorophyll-a concentration ([chl-a]) using remote sensing reflectance (Rrs) derived from MODerate Resolution Imaging Spectroradiometer (MODIS) data. This algorithm is a combination of two models: one for low [chl-a] (oligotrophic waters) and one for high [chl-a]. A satellite pixel is classified as low or high [chla] according to the Rrs ratio (488 and 555 nm channels). If a pixel is considered as a low [chl-a] pixel, a log-linear model is applied; otherwise, a more sophisticated model (Support Vector Machine) is applied. The log-linear model was developed thanks to supervised learning on Rrs and [chl-a] data from SeaBASS and more than 15 campaigns accomplished from 2002 to 2010 around New Caledonia. Several models to assess high [chl-a] were also tested with statistical methods. This novel approach outperforms the standard reflectance ratio approach. Compared with algorithms such as the current NASA OC3, Root Mean Square Error is 30% lower in New Caledonian waters.
Plan de classement
Océanographie [126TELAPP05]
Descripteurs
TELEDETECTION SPATIALE ; DONNEES SATELLITE ; ALGORITHME ; REFLECTANCE ; CHLOROPHYLLE ; LAGON ; COULEUR DE L'OCEAN ; OLIGOTROPHIE ; MODIS
Description Géographique
NOUVELLE CALEDONIE ; ZONE TROPICALE
Localisation
Fonds IRD [F B010063838]
Identifiant IRD
fdi:010063838
Contact