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An improved smile correction for the MERIS instrument

Jean-Paul Huot(1) and Ludovic Bourg(2)

(1) ESTEC, Keplerlaan 1, 2200 AG Noordwijk, Netherlands
(2) ACRI-ST, 260 route du Pin Montard, 06904 Sophia-Antipolis, France

Abstract

The misalignment between the spectrometers and the CCDs in the MERIS instrument gives rise to visible discontinuities in the MERIS ocean colour products at camera interfaces. A first-order correction , that uses the spectral derivatives of the TOA reflectances, is used in the current version of the MERIS ground segment. It is shown that the current algorithm is not sufficiently accurate in the presence of a strong Rayleigh signal and that the Rayleigh contribution to the toa reflectances must be corrected separately from the rest of the signal, and that in the presence of turbidity in the NIR, a pixel by pixel smile correction must be implemented in the bright pixel atmospheric (pre) correction method.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry