An integrated tool for SeaWiFS operational processing
The Marine Environment Unit (Space Applications Institute) has developed a software package for processing SeaWiFS data from Level-1A to Level-3 (daily-to-monthly products over specified maps) over the European area. The data received by all European receiving stations are obtained at GSFC DAAC and all files are first merged into one file per satellite pass at LAC (high-) resolution. This step avoids any overlapping computation and is done once and for all. The Level-2 calculation calls a combined land-sea algorithm. The REMBRANDT code (REtrieval of Marine Biological Resources through ANalysis of ocean colour DaTa) involves an atmospheric correction scheme and in-water algorithms in order to provide standard products such as water-leaving radiance (6 channels), aerosol radiance and optical thickness at 865nm, chlorophyll-a and sediment concentrations and diffuse attenuation coefficient. The atmospheric correction scheme accounts for Rayleigh multiple scattering, aerosol single scattering and Rayleigh / aerosol coupling. It uses ancillary data provided by daily NCEP and TOMS files for atmospheric pressure, wind velocities and ozone values. The products for terrestrial applications result from an optimized vegetation index algorithm that uses 3 channels in the blue, red and near-infrared. This algorithm was developed at the Global Vegetation Monitoring Unit (as well as the Space Applications Institute). This algorithm formulation is optimized so that the index value represents the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR). These products are then re-mapped onto geographical windows of interest and combined in time to yield Level-3 time series.
Bibliographic Reference: EUR 19576 EN (2000) 37 pp.
Availability: Available free of charge from JRC Ispra
Record Number: 200012169 / Last updated on: 2001-06-12
Original language: en
Available languages: en