CAJ | 학술논문

利用大气传输模拟程序MODTRAN(moderate resolution atmospheric radiance and transmission),以同步的中分辨率成像光谱仪(moderate resolution imaging spectroradiometer, MODIS)二级产品的大气廓线数据作为输入,模拟先进星载热发射和反射辐射计(advanced spaceborne thermal emission and reflection radiometer, ASTER)热红外波段的大气波谱透过率和大气上、下行波谱辐射。结合 ASTER 的波谱响应函数和喷气推进实验室(Jet Propulsion Laboratory, JPL)数据库提供的海面发射率,在波谱上求解各像元辐射传输方程。求解获得5个波段海表温度,当这5个波段的海表温度值两两之间温差不超过0.5K时,将其平均值作为该像元的海表温度,用以拟合分裂窗算法的待定系数,最后用分裂窗算法获得整个 ASTER 图像内的海表温度产品。该算法具有比较高的反演精度,与MODIS的海表温度(SST)产品对比,平均偏差为0.35℃,均方根误差0.49℃,而且具有较好的适应能力。将2007年10月20日ASTER图像数据建立的分裂窗算法应用到2008年5月15日的ASTER数据,海表温度反演结果与MODIS的SST产品相比,平均偏差为0.38℃,两者均方根误差为0.52℃。
이용대기전수모의정서MODTRAN(moderate resolution atmospheric radiance and transmission),이동보적중분변솔성상광보의(moderate resolution imaging spectroradiometer, MODIS)이급산품적대기곽선수거작위수입,모의선진성재열발사화반사복사계(advanced spaceborne thermal emission and reflection radiometer, ASTER)열홍외파단적대기파보투과솔화대기상、하행파보복사。결합 ASTER 적파보향응함수화분기추진실험실(Jet Propulsion Laboratory, JPL)수거고제공적해면발사솔,재파보상구해각상원복사전수방정。구해획득5개파단해표온도,당저5개파단적해표온도치량량지간온차불초과0.5K시,장기평균치작위해상원적해표온도,용이의합분렬창산법적대정계수,최후용분렬창산법획득정개 ASTER 도상내적해표온도산품。해산법구유비교고적반연정도,여MODIS적해표온도(SST)산품대비,평균편차위0.35℃,균방근오차0.49℃,이차구유교호적괄응능력。장2007년10월20일ASTER도상수거건립적분렬창산법응용도2008년5월15일적ASTER수거,해표온도반연결과여MODIS적SST산품상비,평균편차위0.38℃,량자균방근오차위0.52℃。
The moderate resolution atmospheric radiance and transmission (MODTRAN), with the input parameters obtained from Terra/MODIS (moderate resolution imaging spectroradiometer), was used to calculate the atmospheric effect parameters, including atmospheric transmittance, upward radiance and downward radiance. Combined with the sea surface emissivity provided by the Jet Propulsion Laboratory (JPL) and spectral response functions for five bands of advanced spaceborne thermal emission and reflection radiometer (ASTER) sensor, the sea surface temperatures (SST) were solved from radiative transfer equations pixel by pixel for each band. If the difference between any two bands’ SSTs for the same pixel is less than 0.5K, the average of five bands’ SSTs of the pixel was taken as true SST, which was then used to derive the undetermined coefficients of Split-Window algorithm. Finally, the Split-Window algorithm was applied for the SST retrieval. The results showed the algorithm has good accuracy. The SST values retrieved from ASTER data acquired on October 20, 2007 were compared to the MODIS SST, which gives the mean deviation of 0.35℃and the root-mean-squared error (RMSE) of 0.49℃. The same procedure was repeated for ASTER data acquired on May 15, 2008, which gives the mean deviation of 0.38℃and RMSE of 0.52℃.