参照TM地表反照率反演算法,建立了适用于HJ-1/CCD传感器估算地表反照率的算法。通过应用6S辐射传输模型建立查找表,对覆盖内蒙古自治区锡林浩特市的HJ-1/CCD数据进行大气校正,并根据反照率定义,回归分析得到可见光波段地表反照率;通过与地面实测数据进行对比分析,表明该算法估算得到的地表反照率精度较高,其最大相对误差为14.32%。同时,本文将估算结果与同时期NDVI进行拟合分析,得出地表反照率与NDVI存在较高的负相关关系。
Referring to TM surface albedo inversion algorithm,the surface albedo estimating algorithm for HJ-1/CCD sensor is established.With look-up table build based on 6S radiative transfer model,we completed the atmospheric correction of CCD images,covering Xilinhot in Inner Mongolia Autonomous Region.According to the definition of albedo,the surface albedo of visible band can be obtained by regression analysis.Through comparison and analysis with the ground measured data,it shows that this approach can estimate surface albedo with high-precision and the maximum relative error is 14.32%.Furthermore,it demonstrated that there is a higher negative correlation between NDVI and albedo by fitting analysis.