基于室内光谱测量的玉米单叶偏振与二向性反射关系研究

本研究利用多角度光度计实测了玉米单叶的偏振反射比与二向反射比数据。该光度计能够在不同的观测天顶角、入射天顶角和方位角下测量目标物的偏振反射和二向反射,获得地物目标在2π空间的多角度观测数据。通过分析实测的偏振反射和二向反射数据,得出了玉米单叶的偏振反射与二向反射之间关系密切,最大与最小偏振反射比之和的平均数约等于同等观测条件下玉米叶片的二向反射比。该研究成果为植被遥感监测做出了一种新的尝试,并且对偏振光遥感、多角度遥感的深入研究与应用提供了依据。

Study of Polarized Reflectance of Corn Leaf and Its Relationship to Laboratory Measurements of Bi-directionaI Reflectance

Polarized and bi-directional reflectance of corn leaves from northeast China were collected with multi-angle reflectance detection instrument in the laboratory.This instrument has the ability to measure polarized reflectance and bi-directional reflectance of targets at various viewing zenith angles,light incidence zenith angles and azimuth angles.We analyzed the relationship between polarized and bi-directional reflectance according to the geometric characters listed above,and found that bi-directional reflectance is approximate half the sum of maximum and minimum polarized reflectance.The relationship between bi-directional and polarized reflectance has a direct relation to the sensor's viewing geometry.This study describes a new method for vegetation remote sensing detection and monitoring,and also provides a theoretical basis for further research on the relationship between polarized reflectance and bi-directional reflectance for remote sensing technology.