Global Biosphere

SeaWiFS Reprocessing #3


In Situ Match-up Comparisons

Chesapeake Bay Regional Analysis

Global Analysis

Cal/Val TM's

Calibration Gain Factors

Overview of the SeaWiFS Calibration/Validation Activities

Changes made since reprocessing #2

  1. Calibration related changes
    1.1 Expanded time-dependent calibration
    1.2 Bilinear gain adjustments
    1.3 Revised vicarious calibration of bands 1 through 6
    1.4 Revised vicarious calibration of band 7
  2. Changes to the atmospheric correction
    2.1 Modified aerosol model selection
    2.2 Epsilon extrapolation
    2.3 Improved Rayleigh computation (wind dependence)
    2.4 Pressure dependent transmittance
  3. Changes to reduce negative water-leaving radiances
    Siegel NIR - "Atmospheric Correction of Satellite Ocean Color Imagery: The Black Pixel Assumption." D. Siegel, M. Wang, S. Maritorena, W. Robinson, submitted to Applied Optics.
  4. General changes
    4.1 Repair problem in level-3 product: chlorophyll / K_490
    4.2 Whitecap correction, Frouin spectral dependent whitecap reflectance
    4.3 Sun glint correction performed
    4.4 Ozone data interpolation improvement
    4.5 Improved K(490) algorithm
    4.6 Absorbing aerosol algorithm for new flag / mask
    4.7 Improved Chlorophyll algorithm - OC4v4
    4.8 Out-of-band correction applied to nLw values
    4.9 Navigation changes: improvements to the navigation algorithms in the level-0-to-1A software to reduce the seasonal variations in geolocation accuracy.
  5. Major product and flag changes
    5.1 Product suite changes - remove La_670, La_865, CZCS_pigment, add nLw_670, angstrom_510
    5.2 Flag changes - 24 flags instead of 16, including break-up of conditions previously under 1 flag and new conditions: absorbing aerosols, trichodesmium, max aerosol NIR iterations; Solar zenith angle threshold increased to 75 degrees