Monitoring method of tobacco leaf equivalent water thickness based on hyperspectral remote sensing

Abstract

The invention relates to the field of tobacco research, in particular to a monitoring method of the tobacco leaf equivalent water thickness based on hyperspectral remote sensing. The inventor conductswater stress tests with different degrees on tobacco leaves for two consecutive years, spectral reflectance of the tobacco leaves with different genotypes under different stress treatments is collected by an ASD spectrograph, the equivalent water thickness of the tobacco leaves is measured synchronously, a ratio moisture index SR and a normalized moisture index ND of pairwise combinations of allwave bands within 350-2500 nm are constructed, correlation between the LEWT of tobacco and spectral characteristic parameters is analyzed, and a spectral characteristic parameter model is constructed.A limit learning machine model is constructed by using the filtered tobacco LEWT spectral index, and P-R<2>=0.853**, T-R<2>=0.855**, RMSE=0.004, the accuracy and robustness of the model are perform well, the monitoring method can be used for predicting the LEWT of the tobacco, and guidance is provided for tobacco field accurate irrigation.

Description

technical field [0001] The invention relates to the field of tobacco research, in particular to a method for monitoring the equivalent water thickness of tobacco leaves based on hyperspectral remote sensing. Background technique [0002] Moisture is very important to tobacco. First, tobacco plants are large, with large leaf surface and large leaf area coefficient, so they must have more water supply. Gong Ting’s research shows that water stress can inhibit the growth of tobacco seedlings, and tobacco leaves will become smaller and more dense. thick, and delay its maturation, plant growth short, etc.; and under soil waterlogging stress treatment, it will also hinder the development of tobacco roots, so that the leaves of tobacco plants become smaller, the plants are short, and long-term waterlogging will lead to Wilting, bottom drying, until death. Second, moisture affects the effectiveness of fertilizers. The third is that water affects the extension of leaves. Fourth, mo...

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Problems solved by technology

[0004] The present invention proposes a method for monitoring the equivalent water thickness of tobacco leaves based on hyperspectral

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