Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Improvement of COMS land surface temperature retrieval algorithm by considering diurnal variation of air temperature

기온의 일 변동을 고려한 COMS 지표면온도 산출 알고리즘 개선

  • Choi, Youn-Young (Department of Atmospheric Science, Kongju National University) ;
  • Suh, Myoung-Seok (Department of Atmospheric Science, Kongju National University)
  • Received : 2016.09.06
  • Accepted : 2016.10.13
  • Published : 2016.10.31
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Abstract

Land Surface Temperature (LST) has been operationally retrieved from the Communication, Ocean, and Meteorological Satellite (COMS) data by the spilt-window method (CSW_v2.0) developed by Cho et al. (2015). Although the CSW_v2.0 retrieved the LST with a reasonable quality compared to the Moderate Resolution Imaging Spectroradiometer (MODIS) LST data, it showed a relatively poor performance for the strong inversion and lapse rate conditions. To solve this problem, the LST retrieval algorithm (CSW_v2.0) was updated using the simulation results of radiative transfer model (MODTRAN 4.0) by considering the diurnal variations of air temperature. In general, the upgraded version, CSW_v3.0 showed a similar correlation coefficient between the prescribed LSTs and retrieved LSTs (0.99), the relatively smaller bias (from -0.03 K to-0.012 K) and the Root Mean Square Error (RMSE) (from 1.39 K to 1.138 K). Particularly, CSW_v3.0 improved the systematic problems of CSW_v2.0 that were encountered when temperature differences between LST and air temperature are very large and/or small (inversion layers and superadiabatic lapse rates), and when the brightness temperature differences and surface emissivity differences were large. The bias and RMSE of CSW_v2.0 were reduced by 10-30% in CSW_v3.0. The indirect validation results using the MODIS LST data showed that CSW_3.0 improved the retrieval accuracy of LST in terms of bias (from -0.629 K to -0.049 K) and RMSE (from 2.537 K to 2.502 K) compared to the CSW_v2.0.

천리안(Communication, Ocean, and Meteorological Satellite) 위성자료로부터 Cho et al.(2015)에 의해 개발된 분리대기창법(split-window method: CSW_v2.0)을 적용하여 현업적으로 지표면온도를 산출하고 있다. CSW_v2.0으로부터 산출된 지표면온도는 MODIS 지표면온도와 비교하였을 때 적절한 수준의 정확도로 산출되었으나 역전층이나 기온감률이 클 때 상대적으로 오차가 크게 발생하였다. 이를 해결하기 위해 지표 경계층에서의 기온의 일변동을 복사전달모델에 처방하여 모의자료를 구축한 후 이를 이용하여 지표면온도 산출 알고리즘을 개선하였다(CSW_v3.0). CSW_v3.0에서는 복사전달모델에 처방된 지표면온도와 복사전달모델로부터 산출된 지표면온도간의 상관계수가 기존 알고리즘과 동일한 수준인 0.99 이상을 유지하면서 편의는 -0.03 K에서 -0.012 K, RMSE는 1.39 K에서 1.138 K로 감소하였다. CSW_v2.0에서 역전층이나 기온감률이 클 때, 휘도온도차와 방출율 차가 클 때 발생하는 계통적 오차를 개선된 알고리즘에서는 편의와 RMSE를 10-30% 감소시켜 상당 부분 개선하였다. CSW_v3.0으로부터 산출된 지표면온도와 MODIS 지표면온도와의 간접 검증에서는 상관계수가 0.986에서 0.985로 높은 상관성을 유지하면서 편의는 0.629 K에서 -0.049 K, RMSE는 2.537 K에서 2.502 K로 오차를 감소시켰다.

Keywords

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