Wetland aquatic vegetation canopy total reflection spectrum radiation transfer modeling method

Abstract

The invention relates to a wetland aquatic vegetation canopy total reflection spectrum radiation transmission modeling method. The method comprises the following steps: calculating based on a PROSPECT-PRO model to obtain leaf reflection and transmission spectrums; inputting canopy structure parameters, observation geometry and leaf anti-transmissivity into an SAILH model, calculating coefficients of absorption, extinction, attenuation, scattering and the like of a vegetation main body canopy by combining with the proportion of the change of the direct light and the scattered light of the sky along with the wave band, and further obtaining four reflection factors of the vegetation canopy; calculating the contribution of a wave water surface reflection component to scene reflection according to the simplified Cox-Munk model; the underwater vegetation is regarded as a constituent part of a water body, absorption scattering coefficients of the water body and the underwater vegetation are calculated according to a Lee shallow water model and an SAILH model, and reflection distribution of an underwater medium is obtained by combining an underwater soil layer; and finally, coupling to obtain the scene bi-directional reflectivity of the whole aquatic vegetation system. The method has the advantages of being wide in spectrum range, high in simulation precision, rich in applicable scene and the like, and has a business popularization prospect.

Description

[0001] (1) The technical field [0002] The invention relates to a modeling method for total reflection spectral radiation transmission of wetland aquatic vegetation canopy, belongs to the field of wetland ecological remote sensing, and has important significance in wetland remote sensing technology research and wetland ecosystem carbon cycle research. (2) Background technology [0003] Climate warming due to greenhouse gas emissions is likely to have serious consequences, such as glaciers retreat, sea level rise, desertification, and changes in ecosystem functioning. For this reason, governments of various countries have attached great importance to the research on carbon "source" / "sink" characteristics and carbon balance estimation, as well as CO2 / CH4 emission reduction and sink increase research at the national scale, and the signing and entry into force of the "Kyoto Protocol" undoubtedly It further promoted the upsurge of carbon cycle research. [0004] Wetlands have bec...

AI Technical Summary

Problems solved by technology

[0007] The present invention relates to a wetland aquatic vegetation canopy total reflection spectrum radiation transmission modeling method, which overcomes the problems of insufficient consideration of the water body background in the aquatic vegetation scene, low simulation accuracy, and narrow spectrum in the traditional model, and its technical solution Yes: Input the leaf biochemical parameters into the PROSPECT-PRO model to calculate the reflectance and transmittance spectral data of a single leaf; input the vegetation canopy parameters, observation geometric parameters and leaf reflectance into the SAILH model, and combine the sky direct light and scattered light The vegetation canopy includes four reflection factors from the sun to the observation direction, the sun to the diffuse direction, the diffuse to the diffuse direction, and the diffuse to the observation direction; according to the simplified Cox-Munk model combined with Fresnel Calculate the contribution of the specular reflection component of the water surface to the scene reflectance by using Al reflectivity; regard the underwater vegetation as a component of the water body, calculate the absorption and scattering coefficients of the water body and underwater vegetation according to the Lee shallow water model and the SAILH model, and combine the underwater soil layer , to obtain the remote sensing reflectance of the underwater medium; integrating the contributions of the above components to obtain the scene bidirectional reflectance of the entire aquatic vegetation system

Images