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Sky dome correction for SeaPRISM and TriOS above water radiometric measurements in MERMAID
Barker, K.; Zagolski, F.; Santer, R.; Kent, C.; Huot, J.-P.; Ruddick, K.; Zibordi, G. (2012). Sky dome correction for SeaPRISM and TriOS above water radiometric measurements in MERMAID. Argans/ParBleu Technologies/Adrinord: Plymouth, St Jean-sur-Richelieu and Lille. 1 poster pp.

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Document type: Poster


Authors  Top 
  • Barker, K., more
  • Zagolski, F.
  • Santer, R., more
  • Kent, C.
  • Huot, J.-P.
  • Ruddick, K., more
  • Zibordi, G.

    The water reflectance, pw, derived from in-situ measurements represents a key element in the validation of MERIS (MEdium Resolution Imaging Spectrometer) atmospheric corrections over ocean. The ESA/MERMAID (MERis MAtchup In situ Database) supports this validation effort with concurrent MERIS/in-situ pw matchups (>30 sites). The water-leaving radiance, Lw, needs to be corrected for the Fresnel reflection of the sky dome by the sea surface. In the standard protocol, the neglect of polarization induces an error on pw. An alternative correction, fully accounting for polarization processes (i.e., sea surface reflection and atmospheric scattering) has been developed to be implemented into two new sky dome correction processors; the latters have been verified with the MERMAID in-situ processing chain for the AERONET-OC SeaPRISM sensor at 8 centre wavelengths (412-1020 nm) and the MUMM hyperspectral TriOS instrument convoluted to the 13 MERIS band filters.The impact of this new correction on the MERIS level-2 product over ocean has been evaluated by validating the pw retrieval in MERMAID.

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