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A method for measuring stand canopy density
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A measuring method and a technology for canopy closure, applied in the field of canopy closure measurement of stands, can solve the problems of expensive equipment, low measurement efficiency, errors, etc., and achieve simple use method, high measurement accuracy, and high use efficiency. Effect
Active Publication Date: 2020-04-03
XIAN BOTANICAL GARDEN SHAANXI PROV
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This determination method is extensive and cannot meet the needs of forestry production and ecological construction.
[0005] In addition, there are currently some instruments for measuring stand canopy density, such as: MooSehom observer, spherical density meter, canopy density tester, and canopy analyzer. The measurement accuracy of such instruments is higher than that of manual measurement, but the equipment It is expensive, inconvenient to carry, and the measurement efficiency is not high. When using it, it is necessary to consider the weather or solar altitude angle to prevent misjudgment of the forest canopy or sky openness due to overexposure or shadows, especially this type of instrument is difficult to operate in some Popularization and application in small temporary plot survey
In addition, due to the natural light shining on the leaves during the day, the contrast of the gap between the leaves is not high, and the edge of the leaves will also produce diffraction phenomenon, which will cause errors in the image analysis and processing of the instrument
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Embodiment 1
[0033] Embodiment one, such as Figure 1-2 Shown:
[0034] A kind of stand canopy density measurement device, comprises unmanned aerial vehicle body 1, and described unmanned aerial vehicle main body 1 comprises landing gear 11, the frame 12 that is fixed on the landing gear and the quadrotor 13 of unmanned aerial vehicle, also includes flying Control module 2, obstacle avoidance module 3, light source 4, image analysis module 5, data analysis module 6, data storage module 7, GPS positioning and navigation module 8, camera module 9, power supply module D1 and controller 10, the flight control Module 2, obstacle avoidance module 3, light source 4, image analysis module 5, data analysis module 6, data storage module 7, GPS positioning and navigation module 8, camera module 9, and power supply module D1 are connected to the controller 10 respectively;
[0035] The flight control module 2 is used to adjust the flight attitude of the UAV body 1. The controller 10 controls the flig...
Embodiment 2
[0044] Embodiment two, such as image 3 Shown:
[0045] A kind of assay method utilizing stand canopy density measuring device to measure forest stand canopy density in embodiment one may further comprise the steps:
[0046] Step1: Establish a rectangular survey sample plot in the test site during the day, fix the positioning piles 111 at the four corners of the sample plot, and then use the reflective tape 112 to surround the survey sample plot. The upper ends of the four positioning piles 111 are respectively Make a mark, and record the latitude and longitude values of the four positioning piles 111 positions with a hand-held GPS, and take a bird's-eye view photo of the four positioning piles with a camera;
[0047] Step2: Input the latitude and longitude values of the positions of the four positioning piles 111 and the top view photos into the controller 10 respectively, the controller 10 controls the data storage module 7 to store, and sets the flight height of the dr...
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Abstract
The invention discloses a device used for measuring wood density. The device comprises an unmanned plane body and a controller, and a flight control module, an obstacle avoidance module, a light source, an image analysis module, a data analysis module, a data storage module, a GPS positioning and navigation module, and a camera shooting module which are connected with the controller. The invention also discloses a measuring method of wood density. The measuring method comprises following steps: establishment of a sample place to be investigated is carried out, the latitude and longitude values of the sample place are recorded, and image information of the sample place is collected and input into the controller; at night, the unmanned plane body is sent to the sample place to determine a flight range, the light source above an airplane frame is turned on to irradiate forest canopy, a camera 1 is used for collecting forest canopy real-time image information, the image analysis module is used for analyzing the image information, and the data analysis module is used for calculating the wood density of the sample place based on image analysis results. The device is simple in structure, and low in cost, and is portable; the measuring method is simple; measuring accuracy is high; and using efficiency is high.
Description
technical field [0001] The invention relates to the technical field of forestry, in particular to a method for measuring stand canopy density. Background technique [0002] Stand canopy density refers to the ratio of the total projected area of the tree canopy in the forest on the ground under direct sunlight to the total area of the stand sample plot, which reflects the density of the stand. [0003] Stand canopy density is an important survey factor in forest resource survey, and also an important factor reflecting forest structure and forest environment. In forest management, canopy density is an important indicator for division of sub-compartments and determination of tending and harvesting intensity, and has become an indispensable factor for forest stock volume estimation through remote sensing images. [0004] In general, a simple and easy sample point determination method is often used, that is, in the forest stand investigation, 100 sample points are mechanical...
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