针对SAIL冠层模型的土壤背景反射率修正

摘要

提出一种基于SAIL模型的地表反射率修正方案,有效减小地形起伏的影响.通过引入太阳直射光的方向-方向反射与大气散射的半球-方向反射,遵循光路可逆原理对地表反射率进行几何修正,同时考虑地表自身热辐射对入瞳辐射的影响从而修正地表反射率,发展适用于SAIL模型的地表反射率修正模型.利用长常高速部分路段的实测植被理化参数及光谱信息对地形修正后的SAIL模型模拟精度进行对比分析,结果表明地形修正后SAIL模型有效提高SAIL模型模拟的植被冠层光谱精度,修正后SAIL模型可为后续南方地区定量遥感的应用提供更精确的数据支持.%In order to reduce the influence of terrain changes in the hilly area, this paper proposes a method based on SAIL model, by introducing the direction reflection of the sunlight and hemisphere-direction reflection of atmospheric scattering.Following the optical reversible principle, it takes a geometry modification to the surface reflectance.And simultaneously considering the influence of soil radiation on the pupil radiation, it develops a surface reflectivity model appropriate for the SAIL model.By comparing and analyzing the simulation accuracy of the terrain modified SAIL model, this paper adopts the vegetation physicochemical parameter in Chang-chang highway and spectral information.The result shows that the terrain modified SAIL model can improve the vegetation canopy spectral accuracy effectively.Meanwhile it can provide more accurate data supports for the application of quantitative remote sensing in South China.