Abstract
Radiometric calibration methods for NOAA AVHRR reflectance channels are reviewed and calibration results for the NOAA-7, -9, and -11 AVHRRs are summarized. Expressions are provided for the gain values and calibration coefficients of these sensors. Analysis shows that significant errors may results in vegetation index calculations from use of prelaunch calibration values for NOAA-11 AVHRR. The postlaunch calibration methods are briefly discussed.
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