提出一种复杂山区光学遥感反射率计算模型,以有效消除地形影响,计算地表反射率.通过推导地形影响下的方向反射,结合辐射传输方程,考虑地表反射目标接收的太阳直射辐射为方向-方向二向反射,反射目标接收的大气漫散射和周围地形背景反射辐射为半球-方向二向反射的综合过程,发展了基于方向反射的地形影响消除和地表反射率计算模型.利用GOMS模型模拟数据及真实光学遥感数据对模型应用能力进行了评价,结果表明此模型具有有效的地形消除能力以及大气校正能力,模型的建立为后续山区定量遥感的应用提供技术支持. This paper presents a calculation model of optical remote sensing reflectance in a complex mountainous area so as to effectively eliminate the influence of the terrain and calculate the surface reflectance.Through deriving the directional reflection under the influence of terrain and combining with the radiation transmission equation, the direct solar radiation received by the surface reflection target is considered as the direction-direction And the diffuse reflection of the target receiving surface and the reflected radiation of the surrounding terrain background are hemispherical-directional two-way reflection, the terrain impact elimination and surface reflectance calculation model based on the directional reflection are developed.Using GOMS model to simulate the data and Real optical remote sensing data are used to evaluate the application ability of the model. The results show that this model has effective capability of terrain elimination and atmospheric correction, and the establishment of the model provides technical support for the subsequent application of quantitative remote sensing in mountainous areas.