【摘要】 利用NASA—ESE提供的算法和代码对EOS/MODIS进行大气校正计算,得到CH1-CH7的地面反射率。再分别用大气校正前后的表观反射率和地面反射率数据计算三种常见植被指数(RVI、NDVI、NDVIg),分析三种植被指数在大气校正前后的变化以及与季节、地物类型之间的关系。指出大气校正并未完全抵消RVI中气溶胶的影响,但在绿度低值区补偿明显；而NDVI和NDVIg从整体上部分补偿了大气影响,在气溶胶较厚或使用绿通道(NDVIg)时必须进行大气校正。更多还原

【Abstract】 By applying the proposed algorithms and associated processing code with NASA-ESE,MODIS radiance of channel 1 to 7 are corrected for atmospheric effects to generate the surface reflectance product. Three kinds of MODIS vegetation index(MODISⅥ) are produced by surface reflectance and apparent re- flectance.The first is ratio vegetation index(RⅥ).The second is standard normalized difference vegetation index(NDⅥ)and the final is green channel normalized difference vegetation index(NDⅥg).In order to ensure the pertinence and applicability of those threeⅥs,the varieties of MODISⅥs before and after being corrected for atmospheric correction are compared and analyzed.更多还原