A Method for Inverting Chlorophyll Fluorescence Spectrum Using Radiance Data Only
A chlorophyll fluorescence and fluorescence spectrum technology, applied in the field of vegetation sunlight-induced chlorophyll fluorescence inversion, can solve problems such as limiting the popularization of the algorithm, and achieve the effect of reducing requirements, simple principle, and easy popularization and application.
Active Publication Date: 2021-12-07
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology
Existing fluorescence spectrum inversion methods include Fluorescence Spectrum Reconstruction (FSR), advanced Fluorescence Spectrum Reconstruction (aFSR) and Full-spectrum Spectral Fitting Method (F-SFM), etc. There is a common shortcoming, that is, it is necessary to provide synchronous solar irradiance data, which limits the generalization of existing algorithms to a certain extent.
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[0032] Step 1: Use the FluorWPS model and the SCOPE model to simulate the fluorescence spectrum and non-fluorescence spectrum data under various physiological conditions; use the reference whiteboard to obtain the measured data under various weather conditions, and combine the existing chlorophyll fluorescence spectrum inversion algorithm to obtain the corresponding fluorescence Spectral and non-fluorescent spectral data; combine simulated and measured data to form a sufficiently representative training spectral library. Among them, the existing chlorophyll fluorescence spectrum inversion method selected is aFSR, and its radiative transfer model is as follows:
[0033]
[0034] In the formula, L(λ) represents the radiance, E(λ) represents the corresponding irradiance, φ rj and φ fi are the reflectance component and the fluorescence component, respectively, c rj and c fi The coefficients to be fitted corresponding to the reflectance component and the fluorescence componen...
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The invention discloses a method for retrieving chlorophyll fluorescence spectrum by using only radiance data, comprising the following steps: Step 1: Obtain chlorophyll fluorescence spectrum curves and non-fluorescence spectra under various ecological conditions based on simulated and measured data, and form a training spectrum Library; Step 2: Carry out singular vector decomposition on the acquired two types of spectral data to obtain their respective singular components; Step 3: Input the combination of the first 10 fluorescent spectral components and non-fluorescent spectral components into the model respectively, and use the least squares method Perform fitting, calculate the unknowns in the radiative transfer model one by one, and calculate the corresponding Bayesian exponent at the same time; step 4: use the number of chlorophyll fluorescence spectral components and non-fluorescent spectral components used when the Bayesian exponent is minimum as the model input, and inversely Chlorophyll fluorescence spectrum was developed. The invention only needs the radiance spectrum data to invert to obtain the chlorophyll fluorescence spectrum, and is no longer limited by the synchronous irradiance data.
Description
technical field [0001] The invention belongs to the technical field of vegetation sunlight-induced chlorophyll fluorescence inversion, in particular to a method for inverting chlorophyll fluorescence spectrum by only using radiance data. Background technique [0002] Sunlight-induced chlorophyll fluorescence is an electromagnetic signal in the range of 640-850nm emitted by chlorophyll molecules after absorbing solar radiation. It has two emission peaks, located at 685nm (left peak) and 740nm (right peak). Chlorophyll fluorescence has the same root as vegetation photosynthetic carbon fixation and heat dissipation. As a by-product of photosynthesis, it carries a large amount of biological and physiological information, and can be used as a direct and non-invasive indicator of photosynthesis status, which can be used to estimate vegetation birth. It has important research significance to monitor the total output value and monitor the early stress of plants. [0003] In most of...
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IPC IPC(8): G01N21/64G06F30/27G06N7/00
CPCG01N21/64G06F30/27G06N7/01
Inventor 高懋芳李石磊李召良
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI