The Korean Geostationary satellite (COMS) to fly in year 2009 will carry a meteorological sensor from which visible
channel measurements will be available. We developed a method utilizing satellite-derived BRDFs for the solar channel
calibration over the bright desert area. The 6S model has been incorporated to account for directional effects of the
surface using MODIS-derived BRDF parameters within the spectral interval in interest. Simulated radiances over the
desert targets were compared with MODIS and SeaWiFS measured spectral radiances in order to examine the feasibility
of the developed calibration algorithm. It was shown that simulated 16-day averaged radiances are in good agreement
with the satellite-measured radiances within about ±5% uncertainty range for the year 2005, suggesting that the
developed algorithm can be used for calibrating the COMS visible channel within about 5% uncertainty level.
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