A kind of determination method of shape index of arbitrary point of tree trunk

A shape index and measurement method technology, applied in the direction of measuring devices, instruments, etc., can solve the problems that the trunk shape index is not an integer, and there is little research on the determination of the value, so as to achieve the effect of accurate and non-destructive data acquisition and fast measurement

Active Publication Date: 2017-08-25
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0005] The trunk shape index of the Kunz-stem curve of the tree trunk is usually an integer value of 0, 1, 2, or 3. Research shows that the trunk shape index in nature is generally not an integer, and there is little research on the specific value of the corresponding height.

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Embodiment Construction

[0017] A method for measuring the shape index of an arbitrary point of a tree trunk, the difference is that:

[0018] 1) According to the sampling principle, select a suitable sample tree in the forest stand, mark its 1.3m position, and measure its ground diameter D with an ordinary girth ruler as a tool 0 , DBH D 1.3 , using the electronic theodolite as a tool to measure tree height H and diameter d at any height i , the corresponding height H i , wherein, i is the number of measured sections of the trunk (i is a positive integer), and it is processed according to the diameter order distribution, and there are k diameter orders;

[0019] 2) Normalized processing, based on the ground diameter, using a mathematical model Calculate the diameter at a relative arbitrary height; take the full tree height as a benchmark, using a mathematical model Calculate the corresponding relative height, after processing, you can get The value range of is (0, 1).

[0020] 3) Using mathe...

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Abstract

The invention provides a method for determining a shape index of a random point of a trunk. Through measuring the ground diameter, the diameter at a breast height, the tree height, the diameter at a random height, and a corresponding height, the shape index of each measurement cross section is calculated after normalization according to diameter class distribution; and furthermore the shape index of the random point of the trunk is estimated according to an actually measured data fitting shape index and a mathematical model of the variables. The method has functions of quickly determining the shape index of the random point of the trunk without loss, realizing convenient operation, effectively protecting an environment, and improving efficiency and precision in determining the shape index of the trunk.

Description

[0001] 1. Technical field [0002] The invention relates to a method for measuring the shape index of an arbitrary point of a tree trunk, in particular to a method for determining the shape index using a non-destructive precise measurement technique. [0003] 2. Technical background [0004] Trunk shape is an important forest characteristic parameter, which plays a decisive role in the determination of trunk volume and the compilation of some forestry data tables. How to accurately and completely express the trunk shape has always been the research focus of forestry workers. Using the trunk shape curve to study the shape of the trunk is a research hotspot and focus in this field in recent years. According to the research of domestic and foreign scholars, it is difficult to use an elementary function to determine the stem-shaped curve, and it is generally fitted with a piecewise linear or nonlinear mathematical model, but its node positions are relatively random and difficult t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/20
Inventor 冯仲科孙素芬蒋君志伟高祥刘明艳孙梦营
Owner BEIJING FORESTRY UNIVERSITY
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