Assessing the Requirements for Sustained Ocean Color Research and Operations (2011) / Chapter Skim
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Appendix A: Past, Present, and Planned Sensors
Appendix A: Past, Present, and Planned Sensors
Pages 79-86
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From page 79... ...
Out of six spectral bands, four were used of the sensitivity in the visible bands (Evans and Gordon, primarily for ocean color. These four bands were centered 1994)
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From page 80... ...
The NASA Ocean Color Group distributes the following products, which are used for a large array of applications Calibration: described in Chapter 2: SeaWiFS mission used MOBY water-leaving radiances Radiances at 412, 443, 490, 555, 670 nm; aerosol optifor the vicarious calibration and near-monthly lunar looks cal thickness at 865 nm; epsilon of aerosol correction at to track spectral band degradation over time. The mission 765 and 865 nm; OC4 Chlorophyll a concentration; diffuse included an extensive calibration/validation program using attenuation coefficient at 490 nm; Angstrom coefficient, 510global in situ measurements for product validation.
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From page 81... ...
rection at 748 and 869 nm; diffuse attenuation coefficient at 490 nm; Angstrom coefficient, 531-869 nm; and sea surface Calibration: temperature. MODIS is calibrated using a combination of solar and lunar viewing to track spectral calibration and temporal Applications: degradation as well as vicarious calibration using in situ MODIS serves a large array of applications including observations of water-leaving radiance.
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From page 82... ...
Algorithms based on these four bands With respect to coastal applications, the current MERIS are substantially unaffected by atmospheric correction errors. instrument has considerable advantages over SeaWiFS, This is particularly important given the complexity of the MODIS, and VIIRS, given its comparatively high spatial atmospheres over the coastal ocean and inland waters.
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From page 83... ...
to assess sensor degradation.6 A per- Aerosol Optical Depth (AOD) at 865 nm and Level 3 (weekly manent cal/val site has been set up in the Lakashadweep Sea, and monthly averages generated on trial basis)
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From page 84... ...
is modest, that even GOCI-like data, if located over CONUS, would with a filter wheel to select one of eight SeaWiFS-like spec- provide coastal data to partially close the existing ocean color tral bands at a time. Nevertheless, the GOCI provides a case data gap.
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From page 85... ...
This sensor is a Data Availability: follow-on to the GLI, a multi-spectral radiometer with 19 Data products expected to be available online.9 wavebands ranging from 375 to 12,500 nm. The 250-m spatial resolution aims at improving coastal ocean and aerosol observations.
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From page 86... ...
Applications: The products derived from these sensors will be applied Calibration: to research on the carbon cycle, marine ecosystem, phyto The need for direct lunar calibration, a vicarious cali- plankton physiology, near-shore and estuarine processes, and bration site, and global data for product validation are listed on physical-biological interactions. among the mission requirements.
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