大气辐射校正软件LEDAPS与FLAASH对比研究

针对LEDAPS与FLAASH 2种大气辐射校正软件,从其算法原理、结果的目视效果以及典型地物的光谱特征等方面进行了对比研究,并利用MODIS相关产品分别对2种模型反演的地表反射率及由其反演得到的NDVI结果进行了评价。结果表明,2种软件操作简便,地表反射率反演的精度较高,均能在一定程度上消除大气影响;LEDAPS反演的地表反射率结果相对FLAASH的结果目视效果较好;根据MODIS NDVI产品对反演获得且升尺度后的红光、近红外波段反射率和NDVI结果评价表明,2种模型校正结果与MODIS数据产品相关性较好,均具有相同的变化趋势,2种模型的反演结果均具有较高的精度,且LEDAPS的反演结果精度更高。

A Comparison Study of Atmospheric Correction Models with LEDAPS and FLAASH

LEDAPS and FLAASH are two of atmospheric correction models which are popular with easy-to-operate. In order to assess the per- formance of eliminating the atmospheric impact more objectively, we focused on the difference between LEDAPS and FLAASH through compar- ison of their algorithms, visual inspection of their results and the spectral characteristics of typical surface features before and after correction. We chose MODIS products （eg. surface reflectance, NDVI） as reference to evaluate the results respectively. The results indicate that these two models could eliminate the atmosphere effect with high precision and are easy to realize. Compared with FLAASH, the results of LEDAPS are more in line with actual situation in visually. With the results being up scaling, both of them are under similar variation tendency and high- ly correlated with MODIS NDVI products. The accuracy of their results is high that both of them could be adopted, additionally, LEDAPS may be more suitable.