Atmospheric Correction of Channel 1 and 2 for NOAA/AVHRR in Rice Yield Estimation

The visible and near infrared radiometric calibration for NOAA/AVHRR can be simplified as the calculation of the light scattering of additive component,and the atmospheric absorption of multiplicave component.Various methods to correct or remove the additive component have been developed,including the widely used dark object subtraction technique.A problem with this method is that the additive components for each spectral band are selected from their histogram respectively.This can create problems because the value selected from histogram is not the really reflectance but is the value which is the standard to divide reflectance into groups.An improved dark object subtraction technique is demonstrated that allows user to select additive component through the spectral statistical results and image displayed on the computer screen dynamically.The improved method can get the actually minimum spectral value .Examples of value differences between the old and improved methods for NOAA/AVHRR channel 1 and channel 2 were compared.Then the transmittance was calculated by visibility.At last,the visible and near infrared band of NOAA/AVHRR was corrected.