基于FLAASH的AVIRIS高光谱影像大气校正

Atmospheric Correction of AVIRIS Hyperspectral Image Based on FLAASH

分析了FLAASH大气辐射传输模型的原理,并利用该模型对美国内华达州CUPRITE矿区AVIRIS高光谱影像进行了大气校正。通过对比校正前后典型地物的光谱曲线、校正后反射率曲线与USGS波谱库反射率曲线发现,大气校正消除了水汽等大气因素的影响,获得了地物反射率;校正后反射率曲线与波谱库反射率曲线相关系数达到0.92,说明利用FLAASH进行大气校正是有效的。

The principle of FLAASH(Fast Line of Sight Atmospheric Analysis of Spectral Hypercubes) atmospheric correction model was analyzed in this paper.And it was used to AVIRIS hyperspectral images in Cuprite,Nevada,United States for atmospheric correction.Typical ground features spectral curves before and after atmospheric correction,corrected reflectance curves and USGS spectral library reflectance curves were compared.The results show that atmospheric correction eliminates the impact of water vapor and other atmospheric factors,ground surface reflectance data is got.Correlation coefficient of corrected reflectance curves and spectral library reflectance curves is up to 0.92.All these indicate that FLAASH is effective for atmospheric correction.