期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2007
卷号：XXXVI-7/C50
出版社：Copernicus Publications
摘要：Modeling radiative transfer in canopies allows efficient use of remote sensing observations to quantify vegetation state variables and functioning. Canopy radiative transfer models use requires accurate description of leaf optical properties. Although widely used, the PROSPECT leaf optical properties model is based on simplifying assumptions that limit its performances. One of these assumptions is that scattering and absorbing materials are evenly distributed in the leaf thickness, leading to the same optical properties for both faces. However, plants have developed particular adaptations resulting sometimes in strong differences in the properties of each faces, in relation to surface characteristics as well as leaf internal structure and distribution of chlorophyll and water. The objective of this paper is to develop a new model accounting for the difference between leaf upper and lower faces. The QSPECT model is an improved version of PROSPECT where the leaf considered made of four layers corresponding to the upper and lower epidermis, the palisade and spongy mesophylls. This advanced model requires four additional parameters describing the distribution of main scattering and absorbing materials. Results acquired over few reflectance and transmittance measurements show that QSPECT is able to describe accurately the typical differences observed between upper and lower leaf faces. Of particular importance are the surface reflectivities as well as chlorophyll content distribution
