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基于MODIS二向反射分布函数(BRDF)模型参数产品数据,利用4-scale模型建立查找表,以中国东北大兴安岭加格达奇地区为研究区,反演森林背景反射率,并分析不同森林类型二向反射与背景反射率特性及其季节变化。研究结果表明:(1)研究区针叶林和混交林二向反射特征较为相似,夏季阔叶林在红光波段的二向反射率值均低于针叶林和混交林,而在近红外波段则相反;不同森林类型二向反射率均存在明显的季节变化,其中阔叶林二向反射率季节变化最为明显;(2)研究区夏季森林背景反射率在红光波段较低,均在0.1以下,近红外波段背景反射率普遍高于0.3,且空间差异较大;(3)不同森林类型的背景反射率季节变化趋势大致相同,但变化幅度存在差异:阔叶林的背景反射率值季节差异最大,尤其在近红外波段。
Based on the product data of MODIS parameters, a 4-scale model was used to establish a look-up table. Based on the region of Jiagedaqi, Daxinganling, northeastern China, the forest background reflectance was inverted, and the spatial variability of different forest types Reflective and background reflectivity characteristics and seasonal variations. The results show that: (1) The characteristics of the two-way reflectance of coniferous forest and mixed forest in the study area are similar. The two-way reflectance of summer broad-leaved forest in the red band is lower than that in coniferous forest and mixed forest, (2) The reflectance of summer forest background in the study area is lower in the red band, both in the seasonal variation of the two-way reflectance of the broad-leaved forest 0.1, the background reflectivity of the near-infrared band is generally higher than 0.3, and the spatial difference is large. (3) The seasonal variation trend of background reflectivity of different forest types is roughly the same, but the variation range is different: the background reflectivity value The biggest seasonal differences, especially in the near infrared band.