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Influence of Water Column Chlorophyll Concentration on Bathymetric Estimations in the Lagoon of New Caledonia, Using Several MERIS Images

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2 Author(s)
Minghelli-Roman, A. ; LSIS, Univ. Sud Toulon Var, La Valette du Var, France ; Dupouy, C.

An estimation of bathymetry in the optically complex lagoon of New Caledonia was performed from multispectral satellite images. Bathymetric estimation was obtained with Medium Resolution Imaging Spectrometer (MERIS) images acquired at different dates. The method is based on the rotation of a pair of spectral bands (red and green bands). One of the resulting images is only depth-dependent when the other is reflectance-dependent. A comparison was made with a compilation of bathymetric data from Institut de Recherche pour le Développement (IRD) Nouméa measurements. This study shows the influence of the variation of water composition, and then of the diffuse attenuation, on bathymetric results. The variation of chlorophyll concentration, correlated with variation of diffuse attenuation, explains the error of the estimation map. The results show that this method remains valid under a low (<;1 mg · m-3) and constant concentration (<;10% of variation) of chlorophyll to limit the variation of RMSE in the image on the bathymetric estimation (<; 15.5%).

Published in:

Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of  (Volume:6 ,  Issue: 2 )

Date of Publication:

April 2013

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