Implementation method of vegetation canopy multi-spectral imaging system

Abstract

The invention relates to an implementation method of a vegetation canopy multi-spectral imaging system. Firstly, a single lens reflex camera is enabled to have a near infrared band imaging capability by reconstruction, the camera is placed on a holder and a tripod, the holder is rotated to a direction of setting a zenith angle and an azimuth angle, a fish-eye lens or telephoto and prime lens is installed, a filter is installed on the lens, the camera is enable to form an image within a single near infrared band or two or more visible light and near infrared bands, and canopy multi-spectral imaging in multiple zenith angle and azimuth angle directions is completed according to a set scheme. Collected vegetation canopy multi-spectral images are classified, and based on classified images, a vegetation canopy woody total area ratio parameter, an aggregation index and photosynthetically active radiation distribution can be calculated The invention prevents vegetation canopy destroyed sampling, is low in manpower and material resource investment, solves problems of a traditional optical measurement method that the error is large, the efficiency is low and the like, and can be applied to measurement of the vegetation canopy wood-total area ratio parameter, the aggregation index and the photosynthetically active radiation distribution.

Description

technical field [0001] The invention relates to the technical field of vegetation canopy multispectral imaging, in particular to a method for realizing a vegetation canopy multispectral imaging system. Background technique [0002] Leaf area index (LAI) is dimensionless, which can be defined as half of the surface area of ​​all green plant organs per unit surface area. As one of the core parameters to characterize the vegetation canopy structure, LAI has been widely used in vegetation growth and productivity models, crop growth models, net primary productivity models, atmospheric models, hydrological models and other models as well as forestry, botany, ecology, agronomy, etc. and other fields. [0003] Photosynthetically active radiation is the main energy source for the synthesis of carbohydrates in plant photosynthesis. Its distribution in the plant canopy can not only affect the change of plant biomass, but also lead to the change of plant morphology. Therefore, the pho...

AI Technical Summary

Problems solved by technology

[0007] Traditional vegetation canopy photosynthetically active radiation measurements are often calculated based on fisheye images (visible light bands). Since the collection of fisheye images (visible light bands) is easily affected by weather conditions, and fisheye images are easily overexposed, resulting in canopy light and reduced accuracy of effective radiation calculations

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