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Measuring system and method of crop canopy spectral indexes

A crop canopy and spectral index technology, which is applied in the field of sensing technology and spectral measurement, can solve the problems of unable to quickly measure farmland, unable to comprehensively evaluate crops, and unable to measure canopy, etc., to simplify measurement methods and measuring instruments, and simple structure , the effect of reducing the impact

Inactive Publication Date: 2011-10-05
CHINA AGRI UNIV
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Problems solved by technology

However, this instrument can only measure a single leaf, cannot measure the canopy, and cannot make a comprehensive evaluation of crop growth. Although it is a portable instrument, it is easy to operate, but it also has the disadvantage of being unable to quickly measure large areas of farmland. In addition, this instrument Only 2 bands are used, and the spectral indices that can be detected are too few

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  • Measuring system and method of crop canopy spectral indexes
  • Measuring system and method of crop canopy spectral indexes
  • Measuring system and method of crop canopy spectral indexes

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Embodiment Construction

[0038] In order to make the purpose, content, and advantages of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the accompanying drawings.

[0039] figure 1 Is a schematic diagram of the system structure of an embodiment of the present invention, figure 2 This is a physical diagram of the system structure of an embodiment of the present invention (the arrow indicates a wireless connection), which is represented by figure 1 , 2 It can be seen that the system is mainly composed of a control subsystem and a measurement subsystem. The control subsystem contains only one controller, which is responsible for calculating, displaying, and storing the data sent from each sensor node. The measurement subsystem includes multiple measurement units. Each measurement unit includes a sensor. The sensor includes 2×N (N≥4) optical channels. The upper N optical channels are used to measure sunlight, and the lower...

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Abstract

The invention discloses a measuring system and a measuring method of crop canopy spectral indexes. The system comprises a measuring subsystem and a controlling subsystem. The measuring subsystem comprises a plurality of measuring units with a same structure. The measuring units collect optical signals, measure light intensities of the optical signals, process the measured light intensities, and transmit the processed data to the controlling subsystem. The optical signals comprise an incident light of sunlight, and a reflected light of the sunlight on the crop canopy. The processing procedures comprise amplification and sampling processing. The controlling subsystem is used for receiving the data transmitted from the measuring subsystem, and for calculating the data to obtain the spectral reflectivity of the crop canopy. A crop canopy spectral index calculating model is embedded in the controlling subsystem. Vegetation indexes are calculated according to the spectral reflectivity and the calculating model. Calculating results are displayed and saved by the controlling subsystem. With the system and method provided by the present invention, the structure of a crop canopy spectral index measuring system is simplified, a novel crop canopy spectral index calculating model is provided, the measuring method is simplified, and the accuracy of the measured results is improved.

Description

Technical field [0001] The invention relates to the field of sensing technology and spectral measurement technology, in particular to a system and method for measuring crop canopy spectral index. Background technique [0002] Information such as vegetation growth and nutrition can be reflected in the spectral reflectance. The reflectance spectrum of crop canopy leaves can be used to calculate a variety of vegetation indices, such as RVI (Ratio Vegetation Index) and NDVI (Normalized Differential Vegetation Index). Index), GVI (Greenness Vegetation Index, greenness vegetation index, etc.), to estimate the chlorophyll content or nitrogen content of the crop canopy leaves, and then judge the crop growth. [0003] There are many ways to measure the spectral reflectance of crops. The American ASD (AnalyticalSpectral Devices) company produces a series of spectroradiometers for measuring the spectral reflectance of ground objects, including full-spectrum portable spectrum analyzers (wavel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08C17/02G01N21/25
Inventor 李民赞李修华张锋张彦娥郑立华李树强
Owner CHINA AGRI UNIV
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