A Basic Study for the Retrieval of Surface Temperature from Single Channel Middle-infrared Images

단일 밴드 중적외선 영상으로부터 표면온도 추정을 위한 기초연구

  • 박욱 (연세대학교 이과대학 지구시스템과학과) ;
  • 이윤경 (연세대학교 이과대학 지구시스템과학과) ;
  • 원중선 (연세대학교 이과대학 지구시스템과학과) ;
  • 이승근 (국방과학연구소 영상정보체계 개발단) ;
  • 김종민 (국방과학연구소 영상정보체계 개발단)
  • Published : 2008.04.30

Abstract

Middle-infrared (MIR) spectral region between 3.0 and $5.0\;{\mu}m$ in wavelength is useful for observing high temperature events such as volcanic activities and forest fire. However, atmospheric effects and sun irradiance in day time has not been well studied for this MIR spectral band. The objectives of this basic study is to evaluate atmospheric effects and eventually to estimate surface temperature from a single channel MIR image, although a typical approach utilize split-window method using more than two channels. Several parameters are involved for the correction including various atmospheric data and sun-irradiance at the area of interest. To evaluate the effect of sun irradiance, MODIS MIR images acquired in day and night times were used for comparison. Atmospheric parameters were modeled by MODTRAN, and applied to a radiative transfer model for estimating the sea surface temperature. MODIS Sea Surface Temperature algorithm based upon multi-channel observation was performed in comparison with results from the radiative transfer model from a single channel. Temperature difference of the two methods was $0.89{\pm}0.54^{\circ}C$ and $1.25{\pm}0.41^{\circ}C$ from the day-time and night-time images, respectively. It is also shown that the emissivity effect has by more largely influenced on the estimated temperature than atmospheric effects. Although the test results encourage using a single channel MR observation, it must be noted that the results were obtained from water body not from land surface. Because emissivity greatly varies on land, it is very difficult to retrieval land surface temperature from a single channel MIR data.

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