A Method for Measuring Tree Diameter with Fixed Angle and Ranging

A measurement method and tree diameter technology, applied in the field of fixed-angle ranging tree diameter measurement, can solve the problems of long operation cycle, difficult measurement and low efficiency of traditional instruments, and achieve the effect of reducing the intensity of measurement operations and improving measurement efficiency.

Active Publication Date: 2017-02-15
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 1. Traditional measurement tools need to go to the standing tree for measurement. It is difficult or even impossible to measure the diameter of the standing tree with complex terrain and difficult to approach.
[0006] 2. With traditional measuring tools, it is difficult or impossible for a single person to complete the measurement work for standing trees with large tree diameters.
[0007] 3. Traditional instruments have long operating cycles and low efficiency, which are far from meeting the needs of forest resources and forestry surveys
[0008] Therefore, the use of traditional instruments to measure the DBH of standing trees in the process of forest resource investigation inevitably brings a lot of trouble

Method used

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  • A Method for Measuring Tree Diameter with Fixed Angle and Ranging
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  • A Method for Measuring Tree Diameter with Fixed Angle and Ranging

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Embodiment Construction

[0022] The tree diameter measurement method of fixed angle ranging is different from the existing tree diameter measurement method, specifically in that:

[0023] (1) The shading coefficient, according to the size of the tree diameter of the standing tree, four different shading coefficients of Fg=0.5, 1.0, 2.0, and 4.0 can be selected. Among them, the distance from the observation point to the blocking sheet is 86 cm, and the width of the blocking sheet is 1.22 cm, 1.72 cm, 2.43 cm, and 3.44 cm. Different Fg corresponds to different viewing angles α in turn.

[0024] (2) To measure the distance from the shielding piece to the standing tree, first aim at the 1.3m of the trunk, move the shielding piece back and forth so that the selected shielding piece just completely blocks the tree diameter of the standing tree, and obtain the oblique distance L from the observation point to the standing tree by measuring s and inclination angle δ, according to the formula ①D s = L s cos(...

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Abstract

The invention discloses a method for measuring the tree diameter through a constant angle. The distance and slant angle of a stand tree are measured through the certain constant angle, and the diameter of the stand tree is measured through calculation. By means of the method, the diameter of the stand tree can be measured under the conditions that the terrain is complex and the stand tree is difficult to get close to, the problem that the diameter at the breast height of stand trees with a large diameter class is inconvenient to measure can be solved effectively, intensity of measurement operation is relieved to some extent, and efficient and accurate measurement of forest resources is achieved.

Description

[0001] 1. Technical field [0002] The invention relates to a method for measuring the diameter of a standing tree by measuring distance at a fixed angle, which uses a certain fixed angle to measure the distance and measure the inclination angle of the standing tree to realize the tree diameter measurement of the standing tree. [0003] 2. Technical background [0004] So far, traditional instruments such as calipers and girths are widely used in forestry to measure the diameter of standing trees. However, there are still many problems in the actual operation of traditional instruments in field surveys: [0005] 1. Traditional measurement tools need to go to the standing tree for measurement. It is difficult or even impossible to measure the diameter of the standing tree with complex terrain and difficult to approach. [0006] 2. With traditional measuring tools, it is difficult or impossible for a single person to complete the measurement of standing trees with large diameters...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/10
Inventor 冯仲科杨立岩
Owner BEIJING FORESTRY UNIVERSITY
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