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A Method for Estimating Forest Parameters Using the Gap Between Trunks

A technology for forest parameters and tree trunks, applied in the field of forest parameter estimation, can solve the problems of underestimation of tree trunk density and trunk chest height, and achieve the effect of avoiding representative problems.

Inactive Publication Date: 2018-06-26
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

[0006] In order to solve the problem of underestimation of the trunk density and the cross-sectional area of ​​the trunk height caused by the mutual occlusion of the trunks, the present invention proposes a method for estimating forest parameters by using the gaps between the trunks. This new method requires the distance data collected by the laser rangefinder accomplish

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  • A Method for Estimating Forest Parameters Using the Gap Between Trunks
  • A Method for Estimating Forest Parameters Using the Gap Between Trunks
  • A Method for Estimating Forest Parameters Using the Gap Between Trunks

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specific Embodiment approach

[0026] In this example, the UTM-30LX-EW 2D laser scanning rangefinder produced by Japan HOKUYO Company is used to collect distance data, and the laser emission speed is set to t (second / piece). According to the technical solution step (1), the operator places the laser rangefinder on the horizontal plane (about 1.3 meters) at the chest height position, from figure 2 Walk from position a to position b at a constant speed of v (m / s), and measure a total of l meters with a tape measure. The laser range finder automatically records all the distances between the laser emission point on the α angle and the intersection point of the tree trunk in the sample plot. If the laser ray has not touched the tree trunk when it reaches m meters, the distance from this point to the laser range finder is recorded as m m, regarded as pores.

[0027] The schematic diagram of the raw data collected by the laser rangefinder is shown in image 3 , the data includes all tree trunks that the laser c...

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Abstract

The invention discloses a method for estimating a forest parameter based on inter-trunk pores. The method comprises the steps that firstly, a laser range fiber collects distance data of a forest sample plot and takes the data as original data; secondly, information of trunks which are completely not shielded is extracted from the original data; thirdly, a trunk pore proportion is extracted from the original data, and the sum of breast-height radiuses of all the trunks in the forest sample plot is calculated according to the proportion; fourthly, the sum of breast-height radiuses of the trunks which are completely not shielded is calculated according to the result obtained at the third step; fifthly, the quantity of the trunks of each hectare is estimated according to the results obtained at the third and fourth steps; and sixthly, a breast-height basal area of each hectare is estimated according to the results obtained at the third and fourth steps. The invention relates to the method for forest parameter estimation and especially relates to the method for estimation of a trunk density and a trunk breast-height basal area in a unit area of sample plot based on the pore size and the pore distribution among the trunks. The method disclosed by the invention can effectively solve the problem that the trunk density and the breast-height basal area are underestimated due to mutual shielding of the trunks. By the method, more accurate estimated values of forest canopy parameters can be obtained in fields of forest resource management, forestry investigation and scientific research.

Description

【Technical field】 [0001] The invention relates to a method for estimating forest parameters, in particular to a method for estimating trunk density (plant number density) and trunk height sectional area per unit area sample plot according to the size and distribution of pores between trunks. The present invention utilizes the size and distribution of pores between tree trunks to establish a new method for estimating forest parameters, and mainly solves the problem of underestimating the trunk density and the cross-sectional area of ​​chest height caused by mutual occlusion between tree trunks. 【Background technique】 [0002] Tree trunk density and tree trunk height sectional area per unit area plot are two basic forest parameters. Both parameters play an important role in environmental management practices, forest resource surveys, and forestry scientific research. [0003] If you want to obtain the tree trunk density or the tree trunk height sectional area per unit area of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/28
CPCG01B11/28
Inventor 范渭亮杜华强周国模舒俊
Owner ZHEJIANG FORESTRY UNIVERSITY
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