Surface reflectance ratios between visible and infrared bands of satellite images over land areas in Japan for retrieval of aerosol optical thickness

The analysis of atmospheric aerosol observation data at Kanazawa, Japan from 2003 to 2005

“…(4) Finally, the values of the surface reflectance ratio for typical land cover classes of vegetation, urban and others (soil and sand) were computed using the relevant surface reflectance values in band 1, 3 and band7.For an example, the reflectance correlation diagrams for the vegetation cover class are shown inFig.6in the case of Continental Model with M=1.50 -i 0.0. Although we found a large dispersion in the correlation diagram in the growing period of vegetation ( spring and summer) in our previous study3) , we have a small dispersion in the correlation diagram in autumn, because of an inactive period of vegetation in this study. The reflectance ratio varies when aerosol size distribution model and its refractive index vary.…”

“…The visible reflectance is determined for certain types of land covers from the relevant infrared reflectance. The empirical reflectance ratio between visible and infrared bands by Kaufman et al 1) was derived on the basis of Landsat TM and airborne images over continental USA and their proposed ratios are not always valid for the corresponding surface covers in Japan, as pointed out in our previous paper 3) . In this study we compute the reflectance ratios between the visible and infrared wavelengths for typical surface covers, such as the vegetation, urban, and other (soil and sand), using several autumn data sets of Terra/MODIS and the sky observation data, synchronized with Terra over-fly time.…”

基于地物光谱矢量空间的遥感图像大气影响校正

“…卫星遥感器在天顶角 v 位置观测来自地面的辐 射, 忽略太阳入射路径与反射路径大气在水平方向 上的差异性, 则观测方向上的透射函数 T 与入射方 向上的透射函数相同, 其值记作 T( s ). 则地面反射 辐射到达遥感器的辐射通量密度 [10] 是: 1 , 若地气系统综合反射效 果符合朗伯体条件, 则总辐射通量密度L 是以上两项 之和 [11] :…”