Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Derivation of Geostationary Satellite Based Background Temperature and Its Validation with Ground Observation and Geographic Information

정지궤도 기상위성 기반의 지표면 배경온도장 구축 및 지상관측과 지리정보를 활용한 정확도 분석

  • Choi, Dae Sung (Department of Atmospheric Science, Pusan National University) ;
  • Kim, Jae Hwan (Department of Atmospheric Science, Pusan National University) ;
  • Park, Hyungmin (Department of Atmospheric Science, Pusan National University)
  • Received : 2015.12.08
  • Accepted : 2015.12.22
  • Published : 2015.12.31
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Abstract

This paper presents derivation of background temperature from geostationary satellite and its validation based on ground measurements and Geographic Information System (GIS) for future use in weather and surface heat variability. This study only focuses on daily and monthly brightness temperature in 2012. From the analysis of COMS Meteorological Data Processing System (CMDPS) data, we have found an error in cloud distribution of model, which used as a background temperature field, and in examining the spatial homogeneity. Excessive cloudy pixels were reconstructed by statistical reanalysis based on consistency of temperature measurement. The derived Brightness temperature has correlation of 0.95, bias of 0.66 K and RMSE of 4.88 K with ground station measurements. The relation between brightness temperature and both elevation and vegetated land cover were highly anti-correlated during warm season and daytime, but marginally correlated during cold season and nighttime. This result suggests that time varying emissivity data is required to derive land surface temperature.

본 연구에서는 천리안위성 기반의 지표면 열적 특성 감시 및 기상현상 탐지에 이용할 수 있는 배경 온도장을 산출하고 지상관측자료 및 지리정보와 비교하여 정확도를 검증하였다. 배경온도장은 밝기온도를 선택하였으며 2012년 자료를 이용하여 월별로 매 시간대에 대해 산출되었다. 밝기온도 자료에서 청천화소와 구름화소를 구별하기 위해 천리안 구름탐지를 사용하였고, 천리안 구름탐지의 입력자료로 사용된 수치모델자료와 공간 균질성 검사 부분에서 구름 오탐지현상을 발견하였다. 과다하게 구름으로 오탐지된 화소는 통계적인 방법에 기반한 구름화소 복원을 통해 해결하였다. 산출된 밝기온도 배경장은 지상관측 기온과 0.95의 상관관계를 보였으며 0.66 K의 편향과 4.88 K의 평균 제곱근 오차를 보였다. 밝기온도 배경장과 고도는 시간대와 계절에 따라 변동성을 보이는 음의 상관관계를 보였다. 녹지와의 상관관계는 기온이 높은 계절 및 주간에 높게 나타났으며, 상관관계의 시간에 따른 변화가 관측되었다. 이러한 이유로 지표면온도 산출 시 시간에 따른 방출률을 별도로 구성해야 할 필요성이 제기되었다.

Keywords

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