Study On PROSPECT-based The Inversion Of Contents Of Copper Inside The Leaves

The radiative transfer model of leaf is the foundation of remote sensing of vegetation. Thereflectance and transmittance of leaf be described by these models with contents of substancesin the leaf and structure of the leaf. Substances in leaf include water, chlorophyll, cellulose,fibrin and starch; Leaf can be divided two kinds of type for its special structure, compact leafand non-compact leaf.This paper study the properties of biochemical leaf compositions as a start, moreover, givenan analysis to the properties of water, chlorophyll and dry matter in the leaf. The common plantleaves were introduced briefly. Then review the radiative transfer theories, The simplest onesconsider the leaf as a single scattering and absorbing layer. In the most complicated ones, all thecells are described in detail (shape, size, position, and biochemical content). Whatever theapproaches, these models have improved our understanding of the interactions of light withleaves.Afterwards, the relationship between substances contents in leaf and reflectance,transmittance and structure of leaf, which contained in PLATE model, introduced entirely. Leafbe consided as an absorbing plate with rough surfaces giving rise to Lambertian diffusion. Thereflectance and transmittance of leaf are represented by a equal ratio decreased function ofabsorption coefficient (k) of leaf, which is a exponential function of refraction(n). The formulasof absorptivity(τ) of leaf be represented with thickness(D) of leaf and absorption coefficient ofleaf(k). and significance of the formulas is that the reflectance and transmittance of leaf can becalculated when pigments in leaf are not uniform distribution.Make next focus, the PROSPECT model based PLATE model is introduced, which is themost popular model when the reflectance and transmittance of broad leaf is calculated. TheStokes (1862) system is introduced, which is commonly used in radiative transfer equations. Asolution for the leaf reflectance and transmittance is derived seriously by complex vector. N hasextended to being a real number when it is necessary. If the reflectance of first layer be known,the others can be iterated under the condition of absorption coefficient known, but these computing have been assumed that all the layers have same property of optic.The reflectance of leaf that stressed by heavy mental is analysed with PROSPECT Model,and some errors had expanded, so the model be developed, then gotten an advancedvision—PROSPECT-4Cu, which inverts the content of copper inside the leaf with the LeastSquare Method.