1.Fisheye lens can be automatically maintained Horizontal state: specifically for the plant canopy structure measurement design of small fish eye camera lens mounted on the handheld universal balance connector, can automatically keep the lens in a horizontal state, without a tripod;
2.The fisheye lens can be extended into the canopy: the lens is mounted on the rocker arm and can be easily horizontally forward or vertically up to the canopy at different heights due to the small size and with the measuring rods. , The vertical distribution of light transmittance and leaf area index in the population was measured.
3.Image analysis software: image analysis software can be arbitrarily defined image analysis area (zenith angle can be divided into 10 zones, azimuth can be divided into 10 areas).
4.Can be shielded unreasonable canopy part: the canopy of different directions for regional analysis, you can arbitrarily shield the terrain and unreasonable canopy part (such as missing, edge line problems, etc.). The selection of the angle and the termination angle of different zenith angles can avoid the canopy conditions that do not meet the parameters of the canopy. By manually adjusting the threshold, the parameters such as leaf area index can be measured more accurately.
5. Optional GPS positioning function
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Usage and Application
NY-S01A plant canopy image analyzer was used to study the canopy of various plant species. The canopy images were obtained by using fisheye lens and CCD image sensor. The related indexes and parameters of plant canopy were obtained by special analysis software. The use of fisheye lens imaging plant canopy data can be measured, only one operation can be simplified, the traditional measurement method to simplify the measurement of multiple points a day, and the use of image measurement canopy can take the initiative to avoid the calculation of the canopy structure The canopy part of the parameter can also escape obstacles that do not meet the measurement calculations.
Test principles and methods
The plant canopy image analyzer uses the principle of canopy porosity and canopy structure. It is based on the law of Bill's weakening of the media. Under the condition of defining a series of hypothesis, the semi-theoretical semi-empirical formula is used to calculate the canopy structure parameters by the determination of canopy porosity. This is the world's various canopy uniform use of the principle. Under the above principle, the plant canopy image analyzer is a method for the analysis of canopy porosity in the canopy hemisphere image analysis. The method is the most accurate and labor-saving, time-saving, fast and convenient method.
Structure and composition
The plant canopy image analyzer consists of a fish-eye image capture probe (composed of a fisheye lens and a CCD image sensor), a built-in 25 PAR sensor measuring rod (rocker), a notebook computer, an image acquisition software and an image analysis software, Of the rechargeable battery pack. The fisheye probe is mounted on the top of a very light rocker arm, which can obtain a fisheye image with a 150 degree angle of view. The display and storage of the images are done by the configured notebook computer.
Leaf area index
Leaf blade average inclination
Sky scattered light transmittance
Radiation transmittance of plant canopy under different solar elevation angles
Extinction coefficient of canopy at different solar altitudes
Azimuth distribution of leaf area density
zenith angle from 0 °~75 ° (150 ° fisheye lens) can be divided into ten areas, azimuth 360 ° can also be divided into ten areas