27 August 2010 Climatology of oceanic zones suitable for in-flight calibration of space sensors
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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.
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Bertrand Fougnie, Bertrand Fougnie, Jérome Llido, Jérome Llido, Lydwine Gross-Colzy, Lydwine Gross-Colzy, Patrice Henry, Patrice Henry, Denis Blumstein, Denis Blumstein, } "Climatology of oceanic zones suitable for in-flight calibration of space sensors", Proc. SPIE 7807, Earth Observing Systems XV, 78070S (27 August 2010); doi: 10.1117/12.859828; https://doi.org/10.1117/12.859828
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