Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
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Sensitivity Analysis of 6S-Based Look-Up Table for Surface Reflectance Retrieval

  • Lee, Chang Suk (Department of Spatial Information Engineering, Pukyong National University) ;
  • Yeom, Jong Min (Satellite Information Research Center, Korea Aerospace Research Institute) ;
  • Lee, Han Lim (Department of Spatial Information Engineering, Pukyong National University) ;
  • Kim, Jae-Jin (Department of Environmental Atmospheric Sciences, Pukyong National University) ;
  • Han, Kyung-Soo (Department of Spatial Information Engineering, Pukyong National University)
  • Received : 2014.10.29
  • Accepted : 2015.01.27
  • Published : 2015.01.31
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Abstract

We created a look-up table (LUT) based on the Second Simulation of the Satellite Signal in the Solar Spectrum (6S) radiative transfer model, which reduces large errors in the surface reflectance retrieval under high solar zenith angle (SZA) conditions. The LUT was calculated in $10^{\circ}$ SZA intervals containing pre-computed atmospheric correction coefficients as a function of discretized pre-defined input parameters. In order to validate the performance of the LUT, we compared the retrieved surface reflectance using the LUT against a retrieval performed using the simplified method of atmospheric correction (SMAC). These results were validated against MODIS reflectance data (MOD09). The surface reflectance obtained using the LUT was highly correlated with the MOD09, with a coefficient of determination ($R^2$) of 0.88 (red band) and 0.94 (NIR). The retrieved surface reflectance had a root mean-squared error of 0.0132 (red band) and 0.0191 (NIR). Accuracy of surface reflectance retrieved using our LUT with a $10^{\circ}$ SZA interval was better than that of the obtained using SMAC. However, certain errors were still present particularly at high SZAs. In order to increase the accuracy at high SZAs, new LUT was computed with a finer SZA interval ($5^{\circ}$) at high SZAs. In both red and NIR bands, the $R^2$, fine SZA interval LUT (0.92) were compared to the coarse SZA interval LUT (0.74) of around $65^{\circ}$. Additionally, the run time for surface reflectance retrievals with our LUT was almost comparable to that of the SMAC, an operational model. This study demonstrates that proper SZAs interval for making LUT in high SZA range.

Keywords

Acknowledgement

Grant : Development of Geostationary Meteorological Satellite Ground Segment

Supported by : NMSC (National Meteorological Satellite Centre)

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