CN106123811A - A kind of forest leaf area index remote monitoring device and measuring method thereof - Google Patents
A kind of forest leaf area index remote monitoring device and measuring method thereof Download PDFInfo
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- CN106123811A CN106123811A CN201610542056.9A CN201610542056A CN106123811A CN 106123811 A CN106123811 A CN 106123811A CN 201610542056 A CN201610542056 A CN 201610542056A CN 106123811 A CN106123811 A CN 106123811A
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- leaf area
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
Abstract
A kind of forest leaf area index remote monitoring device and measuring method thereof, belong to forest ecology detection technique field.The present invention solves the scheme that its technical problem taked: utilize the image-capable of dsp chip and digital operating ability that the forest canopy image obtained by industrial camera is carried out Digital Image Processing, and calculate porosity and leaf area index, communication is carried out with controlling end by 3G module, realize the data transmission of view data, leaf area index result of calculation, control instruction, and utilize solar energy to power for whole system, can realize remotely measuring and control function.The main application purpose of the present invention is: combined by the data transmission capabilities of digital signal processing capability stronger for dsp processor with the long distance high efficiency of 3G module, can realize remotely measuring and remotely controlling of leaf area index.Present configuration is simple, efficiency is high, real-time is good.
Description
Technical field
The present invention relates to a kind of forest leaf area index monitoring device and measuring method thereof, be specifically related to a kind of forest blade face
Long-pending index long-distance monitorng device and measuring method thereof, belong to forest ecology detection technique field.
Background technology
Forest leaf area index LAI (Leaf Area Idex) refers to vegetation blade one side area in land area of one unit
Summation, is one of the important indicator of Ecological Environmental Evaluation, Forests charcoal capability study, phytoecology research, obtains forest leaf
Area index is significant.
Forest canopy leaf area index can obtain by the way of directly measuring and indirectly measuring.The direct method of measurement is adopted more
Measuring by mode manually, time-consumingly, laborious, cost is high, efficiency is low and has destructiveness, therefore, is carrying out ecology
Learn, forestry uses the indirect method of measurement during studying more.The indirect method of measurement include Leaf-area index, based on radiation method,
Porosity inversion method etc..Leaf-area index thrusts forest canopy at an angle by elongated probe, and statistics probe penetrates
The number of times of blade, calculates leaf area index according to corresponding computing formula；Method based on radiation utilizes sunray to pass medium
Time weakening effect judge the characteristic of medium, forest canopy is regarded as the medium with certain regularity of distribution, calculates the spoke of sunlight
Penetrate transmitance, utilize Poisson (Beer-Lambert) model to calculate leaf area index；Porosity inversion method is because of its meter simple to operate
Calculate and conveniently enjoy numerous scholar to praise highly in recent years, when leaf area index is measured, first, obtain forest canopy figure by imaging device
Picture, then calculated gap fraction by canopy image, finally by porosity calculation leaf area index.According to various leaf areas
Index measurement method occurs in that numerous can be used for such as AccuPAR, TRAC, HemiView, LAI-2000, CI-110, MVI measures leaf
The equipment of area index, but these device measuring limited precision and relatively costly, still have and certain improve space.
Existing leaf area index measuring instrument takes the mode of manual hand manipulation to carry out field survey mostly, and it is right to be not suitable for
Forest leaf area index is monitored the most in real time, does not possess remotely control, feature automatic, real-time, efficient.Published
In patent of invention, patent CN102538717A. " automatic leaf area index observation system and method thereof ", patent
CN105004327A. " a kind of vegetation leaf area index information automatic measurement system based on intelligent terminal ", patent
CN104359428A. " a kind of long-term sequence field Forest Leaf Area Index measuring instrument and measurement apparatus thereof ", first, above
Bright patent wireless transport module many employings GPRS module or without long range radio transmissions module, data transmission efficiency relatively 3G wireless module
Slightly inferior, the compatible various communications protocols of 3G wireless module, add the approach of data transmission；Secondly, in data process side
Face, these devices scarcely possess the ability of in-situ processing data, but the data collected are taken back laboratory treatment or incites somebody to action
Data remote transmission is to server process, and the device possessing in-situ processing data capability does not possess the ability of telecommunication；?
After, apparatus above is operationally mostly is single mode of operation, it is impossible to carry out the selection of different working modes according to actual needs.
Summary of the invention
The brief overview about the present invention given below, in order to provide about certain aspects of the invention is basic
Understand.Should be appreciated that this general introduction is not that the exhaustive about the present invention is summarized.It is not intended to determine the pass of the present invention
Key or pith, nor is it intended to limit the scope of the present invention.Its purpose is only to provide some concept in simplified form,
In this, as the preamble in greater detail discussed after a while.
In consideration of it, invention provides a kind of forest leaf area index remote monitoring device and measuring method thereof, it is achieved in real time,
Remotely control, obtain forest leaf area index automatically, efficiently.
Scheme one: a kind of forest leaf area index remote monitoring device that the present invention proposes, props up including device case and triangle
Frame, device case is placed on A-frame, includes measurement part, is wirelessly transferred part and power pack in described device case, described
Measurement part includes DSP panel, display screen, horizontal adjustment steering wheel, vertical steering wheel and the industrial camera of adjusting, described DSP control
Plate outfan connects display screen, horizontal adjustment steering wheel respectively and vertically adjusts steering wheel, described DSP panel with SD card slot,
Button and USB interface, described industrial camera is connected with DSP panel by USB interface, and described industrial camera is arranged on vertical tune
On the support of whole steering wheel, and along with the vertical steering wheel that adjusts rotates, described vertical adjustment steering wheel is arranged on propping up of horizontal adjustment steering wheel
On frame, and along with horizontal adjustment steering wheel rotates, described in be wirelessly transferred the part USB interface phase by data wire and DSP panel
Even, described power pack is powered for measuring partly and being wirelessly transferred part.
Further: described wireless transmission means is divided into 3G wireless module, for by Internet and server with remotely
PC or intelligent movable equipment set up the reception of data cube computation, remote data transmission and remote control signal.
Further: described power pack includes that solar panels, charge controller, accumulator, time switch and voltage stabilizing become
Die block, described solar panels are placed in the outside of device case, charge controller, accumulator, time switch and regulated transformer module
Being placed in the inside of device case, the outfan of solar panels is connected with the input of charge controller, the outfan of charge controller
Being connected with the input of accumulator, the outfan of accumulator is connected with the input of time switch, the outfan of time switch with
The input of regulated transformer module connects, and the outfan of regulated transformer module is the outfan of power pack, for measure part and
It is wirelessly transferred part to power.
Further: the outfan series connection protective tube of described power pack, current supply circuit is provided with on and off switch and time control
Switch, protective tube is used for preventing because fault damages other circuit devcies, and on and off switch is used for controlling to measure part with wireless
The power supply of hop, time switch for the cycle of initialization circuit break-make, can effectively be saved electric power, reduce the damage of circuit devcie
Consumption.
Further: the plastic material that material is Water-proof sun-proof of described device case, device box cover is provided with transparent hemi
Bucker, the bottom of device case is provided with waterproof cooling cover, and described waterproof cooling cover lower end is uncovered, and upper end connects with device case, can
To realize the ventilation and heat in device case, it is ensured that circuit devcie working environment.
Further: described A-frame includes fixing foot, support bar and object stage, described fixing foot is by rotating shaft and props up
Strut connects, and support bar top is connected with object stage through fixing, and described object stage is for placing and immobilising device case and solar energy
Plate.
Scheme two: a kind of forest leaf area index remote measuring method that the present invention proposes, the method is based on scheme one
Described a kind of forest leaf area index remote monitoring device realizes, concrete steps:
The DSP panel utilizing measurement part realizes device function control, image procossing and the leaf area of whole system and refers to
The calculating of number, shoots forest canopy image during system work, it is thus achieved that image is RGB color image from bottom to top, and wherein R is red
Component, G is green component, and B is blue component, RGB image need to be carried out medium filtering process, and RGB image after processing is extracted B
Component image, application ant colony clustering algorithm carries out cluster segmentation to B component image, cluster segmentation result is divided into two classes, respectively
For vegetation area and sky areas, add up the quantity of the pixel of two classes, thus calculate porosity, fixed further according to Beer-Lambert
Rule scheduling theory, is calculated leaf area index by the relation of leaf area index with porosity, and is remotely counted by 3G wireless module
According to transmission.
The effect that the present invention is reached is:
The present invention is directed to existing porosity inversion method and obtain produced problem in leaf area index, it is proposed that a kind of forest leaf
Area index remote monitoring device and measuring method thereof.Compared with being disclosed invention, the present invention takes 3G wireless module to enter
Row remote data transmission, transfer rate is higher and compatible various communications protocols, supports that function is more, takes full advantage of and rapidly send out
The modern communication technology of exhibition, meets people's requirement to communication capacity；The present invention uses dsp chip as controlling to process with data
Chip, can realize the control to whole equipment, can complete again more complicated image processing process and mathematical operation, can be at the scene
Completing data to process, be calculated leaf area index, this rarely has generation in other similar inventions；The present invention can be the most remote
The mode of operation of journey set device, can the measurement result of remote transmission leaf area index, forest canopy image and relevant device ginseng
Numbers etc., Data Transmission Content is optional, can arrange the standby working time cycle of device, saves electric energy, and extends device
Service life, make the work process more hommization of device.Specifically:
1, effective standby working time of monitoring system can be set by time switch, prepare to receive control signal or data
Transmission, saves electric power and device loss.
2, remotely controlling to realize by being wirelessly transferred the 3G wireless module of part with data transmission, 3G wireless module has biography
Defeated speed supports the feature that function is many soon, realizes the adjustment of remote industrial camera angle, control of taking pictures, data transmission by 3G module
Set with monitoring system operating mode, save manpower and time.
3, DSP panel has the function of image procossing and data operation, can realize calculating LAI by forest canopy image
Function, the SD card on DSP panel is for storing the initial data of image and LAI, in case calling at any time, on DSP panel
Display screen be used for showing calculated LAI result, save the data processing step in later stage, convenience and high-efficiency.
Accompanying drawing explanation
Fig. 1 is device case internal structure schematic diagram of the present invention；
Fig. 2 is overall structure schematic diagram of the present invention；
Fig. 3 is present configuration block diagram；
In figure: 10-device case；101-charge controller；102-accumulator；103-time switch；104-regulated transformer mould
Block；105-3G wireless module；106-protective tube；107-on and off switch；108-transparent hemi bucker；109-waterproof cooling cover；
120-DSP panel；1201-SD card slot；1202-button；1203-USB interface；121-display screen；122-horizontal adjustment rudder
Machine；123-vertically adjusts steering wheel；124-industrial camera；20-A-frame；201-object stage；202-support bar；203-fixes
Foot；30-solar panels.
Detailed description of the invention
Hereinafter in connection with accompanying drawing, the one exemplary embodiment of the present invention is described.For clarity and conciseness,
All features of actual embodiment are not the most described.It should be understood, however, that in any this actual enforcement of exploitation
Must make during example much specific to the decision of embodiment, in order to realize the objectives of developer, such as, symbol
Close those restrictive conditions relevant to system and business, and these restrictive conditions may have along with the difference of embodiment
Changed.Additionally, it also should be appreciated that, although development is likely to be extremely complex and time-consuming, but to having benefited from the present invention
For those skilled in the art of disclosure, this development is only routine task.
Here, also need to explanation a bit, in order to avoid having obscured the present invention because of unnecessary details, in the accompanying drawings
Illustrate only and according to the closely-related apparatus structure of the solution of the present invention and/or process step, and eliminate and the present invention
Other details that relation is little.
A kind of forest leaf area index remote monitoring device, bag is The embodiment provides as shown in accompanying drawing 1 to Fig. 3
Including device case 10 and A-frame 20, device case 10 is placed on A-frame 20, includes measurement part, nothing in described device case 10
Line hop and power pack, described measurement part include DSP panel 120, display screen 121, horizontal adjustment steering wheel 122,
Vertical adjustment steering wheel 123 and industrial camera 124, described DSP panel 120 outfan connects display screen 121, horizontal adjustment respectively
Steering wheel 122 and vertical adjustment steering wheel 123, described DSP panel 120 is with SD card slot 1201, button 1202 and USB interface
1203, described industrial camera 124 is connected with DSP panel 120 by usb 1 203, and described industrial camera 124 is arranged on vertical
On the straight support adjusting steering wheel 123, and along with the vertical steering wheel 123 that adjusts rotates, described vertical adjustment steering wheel 123 is arranged on level
Adjust on the support of steering wheel 122, and along with horizontal adjustment steering wheel 122 rotates, described in be wirelessly transferred part by data wire and DSP
The usb 1 203 of panel 120 is connected, and described power pack is powered for measuring partly and being wirelessly transferred part.Described wireless
Hop is 3G wireless module 105, for setting up number by Internet and server with long-range PC or intelligent movable equipment
According to connection, remote data transmission and the reception of remote control signal.Described power pack includes solar panels 30, charge controller
101, accumulator 102, time switch 103 and regulated transformer module 104, described solar panels 30 are placed in the outside of device case 10,
Charge controller 101, accumulator 102, time switch 103 and regulated transformer module 104 are placed in the inside of device case 10, solar energy
The outfan of plate 30 is connected with the input of charge controller 101, and the outfan of charge controller 101 is defeated with accumulator 102
Entering end to connect, the outfan of accumulator 102 is connected with the input of time switch 103, the outfan of time switch 103 and voltage stabilizing
The input of voltage changing module 104 connects, and the outfan of regulated transformer module 104 is the outfan of power pack, for measuring part
Power with being wirelessly transferred part.The outfan series connection protective tube 106 of described power pack, current supply circuit is provided with on and off switch
107 and time switch 103, protective tube is used for preventing because fault damages other circuit devcies, and on and off switch is used for controlling to survey
Amount part and the power supply being wirelessly transferred part, time switch 103 is used for the cycle of initialization circuit break-make, can effectively save electric power,
Reduce the loss of circuit devcie.The plastic material that material is Water-proof sun-proof of described device case 10, device case 10 is covered with
Bright hemisphere bucker 108, the bottom of device case 10 is provided with waterproof cooling cover 109, and described waterproof cooling cover 109 lower end is uncovered, on
End connects with device case 10, it is possible to achieve the ventilation and heat in device case, it is ensured that circuit devcie working environment.Described A-frame
20 include that fixing foot 203, support bar 202 and object stage 201, described fixing foot 203 are connected with support bar 202 by rotating shaft,
Strut 202 top is connected with object stage 201 through fixing, and described object stage 201 is for placing and immobilising device case 10 and solar energy
Plate 30.
A kind of forest leaf area index remote measuring method that present embodiment proposes, the method is based on a described elite stand
Wood leaf area index remote monitoring device realizes, concrete steps:
The DSP panel 120 utilizing measurement part realizes device function control, image procossing and the leaf area of whole system
The calculating of index, shoots forest canopy image during system work, it is thus achieved that image is RGB color image, and wherein R is red from bottom to top
Colouring component, G is green component, and B is blue component, and RGB image need to carry out medium filtering process, and described medium filtering processes
Step is:
1. extract three components of RGB figure, choose suitable masterplate, respectively R, G, B three-component is carried out at medium filtering
Reason；
2. filtered R, G, B three-component is synthesized RGB color image.
RGB image after processing according to medium filtering, extracts B component image, and application ant colony clustering algorithm is to B component image
Carry out cluster segmentation,
Described ant colony clustering algorithm step is as follows:
1. initiation parameter, including classification number k, Population Size m, principle of classification threshold value p0, Pheromone Matrix τij；
2. according to the equally distributed array produced and principle of classification threshold value p0Compare, determine principle of classification basis
Pheromone Matrix τijData classify；
3. pair comprise the solution of each Formica fusca of N number of element, calculate class center Vj, weight matrix μij, object function F (μ, V),
Wherein: class center VjFor average in class,
4. the solution of pair all Formica fuscas carries out local optimal searching, improves the quality solved；
5. determine L optimal solution according to target function value, L < m, update Pheromone Matrix:
Wherein,
6. judge whether to meet termination condition according to iterations and object function, otherwise, perform step 2.
Cluster segmentation result is divided into two classes, respectively vegetation area and sky areas, adds up the quantity of the pixel of two classes,
Application formulaCalculating porosity, in formula, T represents porosity, N0Represent sky areas pixel number, N1Represent vegetation
Part pixel number, can be according to Beer-Lambert law, and leaf area index with the relation of porosity is:In formula, LAI is leaf area index, T (θ) be zenith angle be porosity during θ, G (θ, α) is sky
Drift angle is θ, Leaf inclination is the projection function of α, when θ=57.5 °, and G (θ, α)=0.5 and unrelated with Leaf inclination α, therefore blade face
Long-pending exponential formula is expressed as:Calculate the leaf area index that zenith angle is 57.5 ° of positions,
Remote data transmission is carried out by 3G wireless module.
It is as follows that leaf area index measures job step:
1. device is laid.Selecting suitably to monitor place, must having direct sunlight near monitoring place to use solar energy
Plate 30 powers to accumulator 102；Fixing foot 203 is embedded in underground, makes device fix on the ground with weather-proof invasion and attack.
2. angle adjustment.Button 1202 on application DSP panel 120 adjusts the angle of industrial camera 124 and makes its level
Upwards；The angle of inclination and the direction that adjust solar panels 30 make it sufficiently obtain solar energy.
3. parameter is arranged.The make and break period of time switch 103 is set to realize power pack reasonably to system power supply；If
The technical parameter putting industrial camera 124 ensures to obtain the quality of image.
4. functional test.Monitoring device is powered on, test industrial camera 124, DSP panel 120,3G wireless module 105,
Whether power pack normal, if function is normally, use mobile phone log in Web server test device whether can transceiving data, if
All go well and then represent functional test success.
5. obtain image.Computer or mobile phone is used to log in Web server, by information acquisition terminal image by the wireless mould of 3G
Block is transferred to user operation and controls on platform.
6. result of calculation.Enter operation interface and click " starting to calculate ", check the leaf area index measurement result of device, choosing
Selecting the mode of operation of device, i.e. sending data content arbitrarily can select in original canopy image and leaf area index measurement result
Select；The angle of industrial camera 124 can be controlled so that it is meet requirement of experiment by the control knob on Web server interface.
Although disclosed embodiment is as above, but its content is only to facilitate understand the technical side of the present invention
Case and the embodiment that uses, be not intended to limit the present invention.Technical staff in any the technical field of the invention, not
On the premise of departing from disclosed core technology scheme, any amendment and change can be made in the form implemented and details
Change, but the protection domain that the present invention is limited, still must limit in the range of standard with appending claims.
Claims (9)
1. a forest leaf area index remote monitoring device, including device case (10) and A-frame (20), device case (10)
It is placed on A-frame (20), it is characterised in that: include measurement part in described device case (10), be wirelessly transferred part and power supply
Part, described measurement part includes DSP panel (120), display screen (121), horizontal adjustment steering wheel (122), vertically adjusts rudder
Machine (123) and industrial camera (124), described DSP panel (120) outfan connects display screen (121), horizontal adjustment rudder respectively
Machine (122) and vertically adjust steering wheel (123), described DSP panel (120) with SD card slot (1201), button (1202) and
USB interface (1203), described industrial camera (124) is connected with DSP panel (120) by USB interface (1203), described industry
Camera (124) is arranged on the support vertically adjusting steering wheel (123), and along with vertically adjust steering wheel (123) rotate, described vertically
Adjust steering wheel (123) to be arranged on the support of horizontal adjustment steering wheel (122), and along with horizontal adjustment steering wheel (122) rotates, described
Being wirelessly transferred part to be connected with the USB interface (1203) of DSP panel (120) by data wire, described power pack is for measuring
Part and be wirelessly transferred part and power.
A kind of forest leaf area index remote monitoring device the most according to claim 1, it is characterised in that: described wireless biography
Defeated part is 3G wireless module (105), for setting up number by Internet and server with long-range PC or intelligent movable equipment
According to connection, remote data transmission and the reception of remote control signal.
A kind of forest leaf area index remote monitoring device the most according to claim 1, it is characterised in that: described power supply section
Divide and include solar panels (30), charge controller (101), accumulator (102), time switch (103) and regulated transformer module
104, described solar panels (30) are placed in the outside of device case (10), charge controller (101), accumulator (102), time switch
And regulated transformer module (104) is placed in the inside of device case (10), the outfan of solar panels (30) and charge controller (103)
(101) input connects, and the outfan of charge controller (101) is connected with the input of accumulator (102), accumulator
(102) outfan is connected with the input of time switch (103), the outfan of time switch (103) and regulated transformer module
(104) input connects, the outfan that outfan is power pack of regulated transformer module (104), for measuring part and nothing
Line hop is powered.
A kind of forest leaf area index remote monitoring device the most according to claim 3, it is characterised in that: described power supply section
Point outfan series connection protective tube (106), current supply circuit is provided with on and off switch (107), protective tube be used for preventing because of circuit therefore
Barrier damages other circuit devcies, and on and off switch is for controlling to measure partly and be wirelessly transferred the power supply of part.
A kind of forest leaf area index remote monitoring device the most according to claim 4, it is characterised in that: described device case
(10) material is the plastic material of Water-proof sun-proof, and device case (10) is covered with transparent hemi bucker (108), device case
(10) bottom is provided with waterproof cooling cover (109), and described waterproof cooling cover (109) lower end is uncovered, and upper end is with device case (10) even
Logical.
A kind of forest leaf area index remote monitoring device the most according to claim 1, it is characterised in that: described triangle props up
Frame (20) includes fixing foot (203), support bar (202) and object stage (201), and described fixing foot (203) passes through rotating shaft and support
Bar (202) connects, and support bar (202) top is connected with object stage (201) through fixing, and described object stage (201) is for placing also
Immobilising device case (10) and solar panels (30).
7. a forest leaf area index remote measuring method, the method is based on forest leaf area a kind of described in claim 1
Index remote monitoring device realizes, concrete steps:
The device function control, image procossing and the leaf area that utilize the DSP panel (120) measuring part to realize whole system refer to
The calculating of number, shoots forest canopy image during system work, it is thus achieved that image is RGB color image from bottom to top, and wherein R is red
Component, G is green component, and B is blue component, RGB image need to be carried out medium filtering process, and RGB image after processing is extracted B
Component image, application ant colony clustering algorithm carries out cluster segmentation to B component image, cluster segmentation result is divided into two classes, respectively
For vegetation area and sky areas, add up the quantity of the pixel of two classes, apply formulaCalculate porosity, T in formula
Represent porosity, N0Represent sky areas pixel number, N1Represent vegetation part pixel number, according to Beer-Lambert law
Scheduling theory, can be from which further followed that leaf area index by porosity, carries out remote data transmission by 3G wireless module.
A kind of forest leaf area index remote measuring method the most according to claim 7, it is characterised in that: described intermediate value is filtered
The step that ripple processes is:
(1). extract three components of RGB figure, choose suitable masterplate, respectively R, G, B three-component is carried out medium filtering process；
(2). filtered R, G, B three-component is synthesized RGB color image.
9. according to a kind of forest leaf area index remote measuring method described in claim 7 or 8, it is characterised in that: described ant
Clustering class algorithm steps is as follows:
Step a. initiation parameter, including classification number k, Population Size m, principle of classification threshold value p0, Pheromone Matrix τij；
Step b. is according to the equally distributed array produced and principle of classification threshold value p0Compare, determine principle of classification basis
Pheromone Matrix τijData classify；
The solution of step c. each Formica fusca to comprising N number of element, calculates class center Vj, weight matrix μij, object function F (μ, V),
Wherein: class center VjFor average in class,
Step d. carries out local optimal searching to the solution of all Formica fuscas, improves the quality solved；
Step e. determines L optimal solution according to target function value, L < m, updates Pheromone Matrix:
Wherein,
Step f. judges whether to meet termination condition according to iterations and object function, otherwise performs step b.
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| CN106846309A (en) * | 2017-01-19 | 2017-06-13 | 东北林业大学 | The automatic estimating method of the forest land surface dead combustible fuel carrying capacity based on image |
| CN107610066A (en) * | 2017-09-21 | 2018-01-19 | 电子科技大学 | A kind of leaf area index measuring method |
| CN107782259A (en) * | 2017-09-21 | 2018-03-09 | 电子科技大学 | A kind of measurement of leaf area index based on wireless sensor network |
| CN112857269A (en) * | 2021-03-15 | 2021-05-28 | 南宁师范大学 | Novel leaf area index instrument and leaf area index measuring method thereof |
| CN115908824A (en) * | 2023-03-09 | 2023-04-04 | 四川腾盾科技有限公司 | Method for quickly segmenting sky area of large unmanned aerial vehicle |
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| CN107782259A (en) * | 2017-09-21 | 2018-03-09 | 电子科技大学 | A kind of measurement of leaf area index based on wireless sensor network |
| CN112857269A (en) * | 2021-03-15 | 2021-05-28 | 南宁师范大学 | Novel leaf area index instrument and leaf area index measuring method thereof |
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