In ocean color remote sensing

Rayleigh scattering dominates the signal measured at the top-of-atmosphere（TOA）.Therefore

as the first step in atmospheric correction

Rayleigh scattering item must be computed accurately and removed from the sensor measured total signal.According to the four bands of HY-1A CCD

Rayleigh reflectance under various conditions is computed using 6S model.Based on the computations

the Rayleigh reflectance features are analyzed

including the effect of atmospheric type

wavelength and band averaging resulting from the broad band width of this sensor.The HY-1A CCD Rayleigh lookup tables are generated

and applied to the remotely sensed data processing with the primary evaluation of its validity.