针对OMIS I机载成像光谱数据,通过6S辐射传输码模拟计算和相应理论分析,讨论了观测角变化对传感器入瞳处辐射亮度的影响和由此引起的反射率反演误差.结果表明:在太阳反射波段,观测角的影响有很强的波段特性,大气散射作用较强的短波长波段与大气气体强吸收波段是这种影响的敏感波段;地面目标亮度不同,这种影响也是不同的,对低反射率目标影响较大,而对高反射率目标影响甚微;另外遥感器飞行高度也是决定这种影响情况的重要因素.

Based on the high resolution imaging spectrometer data of OMIS I we performed a simulative calculation from 6S. Relation between radiance at satellite level and variety of zenith observation angle was discussed and correlative error in the retrieve of surface reflectance was analyzed, simultaneously. The results show that there are spectral properties about this effect, it is sensitive in the strong scattering regions and the major absorption channels by atmosphere;On the other hand, the brightness of targets and the flight elevation decides this effect. Based on this analysis a primary correction strategy was given