Abstract
A new online resource from the National Oceanic and Atmospheric Administration provides an interactive view of global satellite ocean color and true-color imagery.
Highlights
A number of ocean-colour sensors designed to produce global ocean-colour products have been successfully launched in recent years: the Ocean Color Temperature Scanner (OCTS) from NASDA ( Japan Aerospace Exploration Agency (JAXA)) and CNES’s Polarization and Directionality of the Earth’s Reflectances (POLDER)-1, NASA’s Sea-Viewing Wide Field-of-View Sensor (SeaWiFS), NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS) on Terra, European Space Agency (ESA)’s Medium Resolution Imaging Spectrometer (MERIS), NASA’s MODIS on Aqua, the Global Imager (GLI) from NASDA ( JAXA) and POLDER-2 from CNES
Othe TOA sun glint radiance T (λ)Lg(λ) is mostly masked out and residual contamination is corrected based on a model of sea surface slope distribution (Cox and Munk, 1954; Wang and Bailey, 2001); Othe fact that [Lw (λ)]N is negligible in the NIR, can be used to estimate the combination La(λ) + Lra(λ) in the NIR bands, and aerosol modelling can be used to extrapolate it from the NIR to the visible bands; and
Supported by the corresponding agencies and countries, there has been a significant effort in acquiring ocean-colour in situ data, for validating the ocean-colour products produced by the satellite ocean-colour sensors SeaWiFS, MODIS, MERIS, OCTS/GLI, and POLDER
Summary
The IOCCG established the atmospheric correction working group (ACWG) because atmospheric correction is a key procedure in remote sensing of ocean colour. Four operational atmospheric correction algorithms are discussed, and their performances for various cases are compared These include algorithms for SeaWiFS and MODIS-Aqua (Gordon and Wang, 1994a; Gordon, 1997), MERIS Significant progress has been made in the development of other approaches for atmospheric correction, dealing with cases for strongly-absorbing aerosols and waters with non-negligible near-infrared (NIR) ocean contributions. Another objective of the ACWG was to provide the ocean community with an overview of the current status of atmospheric correction algorithm development, including a more complete list of references for those who are interested in the details. The report focuses only on intercomparisons between the various algorithms
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