A Preliminary Evaluation Study on the Typical Gli Ocean Color Band Image by Simulation

ADEOS-II will be launched in the near future. It's main feature is to collocate many remote sensing instruments in the same platform. Within those sensors, Global Image (GLI) is considered to be a main sensor which will play a key role. In order to understand the characteristics of future GLI images of ocean color, we have first introduced the simulation models briefly, and simulated typical cases of radiance images at visible bands, in which the radiance distribution is based on geographic location, the satellite orbital parameters and sensor properties. The various simulated images of full satellite passes show the distribution of every radiation component (aerosol scattering, Rayleigh scattering, Sun glitter, water-leaving radiance and the total radiance). A method to evaluate the image quality and availability is developed by using the characteristics of image so called the Complex Signal Noise Ratio (CSNR). Meanwhile, a sires of CSNR images are generated from the simulated radiance components for different cases, which can be used to evaluate the quality and availability of GLI images before the ADEOS-II is placed in orbit. Finally, the quality and availability of GLI imagey are quantitatively analyzed by the simulated CSNR data. The results will be beneficial to all scientists who are in charge of GLI mission and to those who plan to use the data from GLI.