CAJ | 학술논문

随着时间的推移，卫星传感器的老化会使得原有的辐射定标参数文件（CPF）失效。最典型的当属 Landsat 5卫星，该卫星自1984年发射以来，已经进行了多次 CPF 修正；而 Landsat 7卫星的 CPF 也经过了数次修改，以保证辐射校正结果的准确性。以 Landsat TM/ETM＋遥感影像为例，分别以2003、2009年的 CPF 对它们进行辐射校正，并对结果进行对比。结果表明，除 ETM＋的绿光波段外，TM、ETM＋影像基于2009年 CPF 计算的各波段均值都要小于2003年。而这一变化也使得由此计算的指数产生差异：归一化植被指数（NDVI）间的差异可达0．48％，建筑用地指数（IBI）间的差异可达5．94％。
수착시간적추이，위성전감기적노화회사득원유적복사정표삼수문건（CPF）실효。최전형적당속 Landsat 5위성，해위성자1984년발사이래，이경진행료다차 CPF 수정；이 Landsat 7위성적 CPF 야경과료수차수개，이보증복사교정결과적준학성。이 Landsat TM/ETM＋요감영상위례，분별이2003、2009년적 CPF 대타문진행복사교정，병대결과진행대비。결과표명，제 ETM＋적록광파단외，TM、ETM＋영상기우2009년 CPF 계산적각파단균치도요소우2003년。이저일변화야사득유차계산적지수산생차이：귀일화식피지수（NDVI）간적차이가체0．48％，건축용지지수（IBI）간적차이가체5．94％。
As time goes by,the aged satellite sensors have made the original Calibration Parameter File (CPF)of the sensors become invalid.Typically the CPF of the Landsat 5 Thematic Mapper (TM) was modified several times since its launch in 1984,and so did the CPF of Landsat 7 Enhanced Thematic Mapper Plus (ETM+).Otherwise the accuracy of the image radiometric correction is not ensured.In this study,two scenes of Landsat TM and ETM+ images have been corrected using their CPFs issued in 2003 and 2009,respectively.These radiometrically-corrected images were then compared to see whether there was any difference between the correction results.The band-by-band comparison reveals that,except the green band of ETM+,the mean value of TM and ETM+ bands calculated with the 2009 CPF is less than that calculated with the 2003 CPF.This also has influenced on the Normalized Difference Vegetation Index (NDVI)and build-up index (IBI)computation.The difference in the mean value between the NDVIs calculated using the 2003 and 2009 CPFs amounts to 0.48%,while this figure between the IBIs can reach to 5.94%.