Retrieving water-leaving reflectance from HJ1 CCD imagery aided by MODIS product

This paper researches on the method how to retrieve the water-leaving reflectance from Chinese HJ1 CCD imagery. The instrument characteristics are first analyzed and then the monochromic atmosphere correction equation is described. Using the radiative transfer model, the correction parameters are worked out by varying different conditions such as sun-observation geometry, aerosol models and so on. The results are stored in look-up table (LUT). Moreover, the MODIS data are used to make certain aerosol load and water vapor volume, which are the input parameters of the pixel-by-pixel procedure. The retrievals of water-leaving reflectance are finally compared to the in Situ measurement and MODIS results. It is found that the correction accuracy is good especially in the blue and green bands. This paper demonstrates that this method is a simple and efficient approach and well worth applying to future conventional production.