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Canopy density measurement method and device

A technology of canopy closure and summation, applied in the field of forest managers and forest management, can solve the problems of low precision and high cost

Inactive Publication Date: 2014-10-29
RES INST OF FOREST RESOURCE INFORMATION TECHN CHINESE ACADEMY OF FORESTRY
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  • Application Information

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Problems solved by technology

[0009] Embodiments of the present invention provide a method and device for measuring canopy density, which can solve the problems of high cost and low precision in the prior art

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  • Canopy density measurement method and device
  • Canopy density measurement method and device

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Embodiment 1

[0057]Canopy density is the ratio of the area covered by the vertical projection of the tree canopy in the sample plot to the area of ​​the sample plot. Assuming that the ground is "translated" to the position of the tree, the "ground" is composed of the part covered by the tree crown and the part not covered (that is, the gap). Space image, and then count the size of the canopy coverage, then its percentage of the entire image area is the canopy density within the range of photography. A more direct way of thinking, the image formed by vertical upward photography of the camera is the canopy space miniaturized on the image plane, which is the sum of the image formed by the two parts of the canopy and the canopy gap. The ratio of the area is equal to the ratio of the corresponding canopy area to the forest land area. Therefore, the problem is transformed into segmenting and extracting the canopy image part in the image, and its proportion to the entire image is the canopy densit...

Embodiment 2

[0090] This embodiment provides a device for measuring canopy density, including: an image acquisition unit, used to obtain the image of tree crown projection; a conversion unit, used to convert the image into a grayscale image; a statistical unit, used to count the grayscale image The number of pixels in each gray level; the determination unit is used to determine the canopy closure according to the number of pixels in each gray level.

[0091] The determination unit includes: a first threshold determination unit, which is used to determine the segmentation threshold according to the variance method between groups; a calculation unit, which is used to traverse all pixels in the grayscale image: if a certain pixel value is less than the segmentation threshold, it means that the pixel is a tree crown image , count 1, otherwise it is considered as a canopy gap image and not counted; the ratio of the count sum to the total number of image pixels is the canopy density of the forest...

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Abstract

An embodiment of the invention provides a canopy density measurement method and device which can solve the problems of high cost and low precision in the prior art. The method comprises the following steps: obtaining projected images of tree crowns; converting the images into grayscale images; summarizing pixels of each gray level in the grayscale images; and determining canopy density according to the pixels of each gray level. According to the canopy density measurement method and device in the invention, an existing camera device with a calculating function, such as an intelligent mobile phone, IPAD, a camera + a computer and the like can be utilized; and when the method in the invention is applied to the device above, the function of the canopy density measurement method and device can be realized. Therefore, under the condition of not increasing extra hardware, forest canopy density can be obtained through control software from the image analysis angle; the canopy density measurement method and device are easy to operate and seeing-is-obtaining effect is achieved; and the canopy density measurement method and device are high in precision, fast in speed, and is extremely suitable for current wild forest survey work.

Description

technical field [0001] The invention relates to the fields of forest managers and forest management, in particular to a method and device for measuring canopy density. Background technique [0002] Canopy density is an important factor reflecting forest structure and forest environment. It is widely used in soil erosion, water conservation, forest stand quality evaluation, forest landscape construction, etc. At the same time, it is an important factor for the division of small groups in forest management and the determination of tending and cutting intensity. , An important factor in judging whether it is a forest. [0003] The so-called canopy density is the ratio of the vertical projected coverage area of ​​the tree canopy in the sample plot with woodland or sparse forest to the area of ​​the sample plot, which indicates the degree of closure of the canopy. There are many methods for measuring canopy closure, the most typical and commonly used ones are diagonal method, pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
CPCG01B11/28G01C11/04
Inventor 王雪峰李晓冬
Owner RES INST OF FOREST RESOURCE INFORMATION TECHN CHINESE ACADEMY OF FORESTRY
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