A Radiation Based Topographic Correction Method on Landsat 8/Oli Surface Reflectance

To reduce the topographic influence on the high-resolution optical remote sensing data, a radiation based topographic correction method was developed in this study by normalizing the solar illumination differences in mountain areas with the use of high-resolution downward shortwave radiation data (DSR). The coarse-resolution Meteosat Second Generation (MSG) SEVIRI DSR product was downscaled to the same spatial scale as the Landsat 8/OLI data to obtain the high-resolution DSR. The correction results indicated that the corrected spectral reflectance is poorer correlated with solar illumination than the original one. In addition, the corrected images also maintain the spectral characteristics with few overcorrections. Therefore, the proposed method will be of good potential in mountain remote sensing data process to reduce the topographic impacts.