Spectral index constructing method for detecting carbon nitrogen ratios of canopy leaves of crops
A spectral index and construction method technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of rare spectral index method for detecting carbon-nitrogen ratio, lack of stability, detection error, etc., achieve rich reflectance information, eliminate Differences in lighting conditions, the effect of eliminating heterogeneity
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[0029] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0030] like figure 1 As shown, the spectral index construction method for detecting the carbon-nitrogen ratio of crop canopy leaves according to the present invention comprises steps:
[0031] (1) Acquire the raw hyperspectral reflectance data of the crop canopy in the range of 500nm to 910nm: if a portable hyperspectral measuring instrument capable of measuring the spectrum of the crop canopy in the range of 500nm to 910nm is used, the radiation of the crop canopy can be directly measured in the field. Brightness or DN value data, the original hyperspectral reflectance of the crop canopy can be calculated through the corresponding reference plate calibration parameters; ...
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