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Climate & Radiation
Geodesy and Geophysics
Wallops Field Support
Branch Seminar Series: Gerhard Meister
Wednesday, April 22, 2009 - 21:00
The goal for Ocean Color sensors is to determine the constituents of the ocean water, e.g. plankton or sediments. This can be achieved by analyzing water-leaving radiances in the visible and NIR spectrum. Ocean color radiometry from space-borne sensors is challenging, because the desired signal is masked to a large part by atmospheric radiances and sun glint. Therefore, the desired radiometric accuracy is on the order of a tenth of one percent. This level of accuracy is not achievable for current imaging radiometers in an absolute sense, but ocean color algorithms only require relative accuracy. This talk describes calibration and characterization issues of several space-born US ocean color sensors, in particular polarization characterization, striping effects, and long term trending. A recurring theme is the importance of specifications in designing a new sensor. This will be illustrated with several examples from SeaWiFS, MODIS on Aqua and Terra, and VIIRS.