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Proceedings Paper

Climatology of oceanic zones suitable for in-flight calibration of space sensors
Author(s): Bertrand Fougnie; Jérome Llido; Lydwine Gross-Colzy; Patrice Henry; Denis Blumstein
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Paper Abstract

One way to calibrate space sensors on the visible part of the spectrum is to use acquisitions over Rayleigh scattering for dark surface conditions. Oceanic sites are good candidates because of their behaviour in term of spatial homogeneity and temporal stability. An appropriate selection is consequently required to identify the best oceanic areas. Nevertheless, the knowledge of the surface reflectance of such sites remains a limitation while their stability (and/or homogeneity) is usually not perfect. A previous study (Fougnie et al., 2002) has defined a selection of oceanic sites using one year of SeaWiFS data and regarding their spatial homogeneity and temporal stability. A first characterization of their monthly surface reflectances was derived (seasonal cycle) and used for several years as input for in-flight calibration processes. The major oligotrophic sites are located in North/South Atlantic and Pacific oceans, in Indian ocean, and in the Mediterranean Sea while some other mesotrophic sites were also defined for example in the Gulf of Mexico or Yucatan strait. The goal of this study was to revisit the definition of these sites regarding their spatial homogeneity and to analyze the annual cycle over 9 years of L3B R-2009 SeaWiFS products. Site behaviours are accurately defined with these longer time series, hence new recommendations are drawn for all sites and an updated climatology is proposed to be used for future in-flight calibrations.

Paper Details

Date Published: 27 August 2010
PDF: 11 pages
Proc. SPIE 7807, Earth Observing Systems XV, 78070S (27 August 2010); doi: 10.1117/12.859828
Show Author Affiliations
Bertrand Fougnie, Ctr. National d'Études Spatiales (France)
Jérome Llido, Cap Gemini (France)
Lydwine Gross-Colzy, Cap Gemini (France)
Patrice Henry, Ctr. National d'Études Spatiales (France)
Denis Blumstein, Ctr. National d'Études Spatiales (France)


Published in SPIE Proceedings Vol. 7807:
Earth Observing Systems XV
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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