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Method for measuring tree-crown volume fractal dimension by applying three-dimensional laser image-scanning system

A technology of image scanning and tree crown volume, applied in image data processing, optical devices, measuring devices, etc., can solve problems such as differences in tree crown shapes and difficulties in research work, and achieve the effect of eliminating scale dependence

Inactive Publication Date: 2009-09-02
NAT INST OF METROLOGY CHINA
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Problems solved by technology

The combined effect of these factors will lead to large differences in the crown morphology of different individuals of the same tree species, which will bring difficulties to related research work

Method used

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Embodiment Construction

[0009] 1. Set up a 3D laser scanner within the effective range in front of the tree, adjust the parameters and posture, scan the tree crown, obtain the 3D spatial lattice data of the tree crown, and obtain the center of the control target at the same time to obtain a point cloud map; through coordinates Matching, "joining" different point cloud images of tree crowns in the same coordinate system, after data preprocessing, extraction and other functions, in order to establish a three-dimensional model of tree crowns. Since the tree crown does not have a stable solid shape like the trunk, the tree crown has many gaps, and the laser beam may penetrate the tree crown and reflect in the tree crown, so the obtained point cloud data does not fully reflect the spatial characteristics of the outer layer of the tree crown. In order to obtain the solid 3D model of the canopy, the point cloud data is rotated and scaled in the software, and the points that are not on the surface of the cano...

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Abstract

The invention discloses a method for measuring tree-crown volume fractal dimension by applying a three-dimensional laser image-scanning system. The method comprises the steps of utilizing the three-dimensional laser scanning system to scan a tree-crown, obtaining the three-dimensional space lattice data of the tree-crown, establishing the tree-crown three-dimensional space model and calculating the surface area and volume of the tree-crown; and then linear fitting by taking the logarithm value of the tree-crown volume as an independent variable and taking the logarithm value of leaf biomass as an induced variable so as to determine that the measured tree-crown volume fractal dimension is three times of the linear fitting slope. The method avoids felling stumpage and protects the forests; and simultaneously, the adoption of the fractal dimension as the new parameter representing the tree-crown pattern structure is a beneficial supplement for the forest-measurement and significant for further studying the growth of trees.

Description

technical field [0001] The invention relates to a method for extracting the ecological characteristics of tree populations, in particular to a method for measuring tree crown volume fractal dimension by using a three-dimensional laser image scanning system. technical background [0002] The crown is the totality of all the branches and leaves of the tree, and it is the structural basis for the growth and development of the tree and other functions. The shape of the canopy depends on the genetic characteristics of the tree and environmental factors. Each tree species can basically show a specific crown shape when its individual matures, indicating that the crown shape of the same tree species is consistent in genetic characteristics. However, the shape and development status of the tree crowns in the forest stands are different, which is the result of the combined effects of factors such as age, site conditions and competition among trees. The combined effect of these facto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01B11/28G06T17/00
Inventor 罗旭邓向瑞李建双赵岩张京燕
Owner NAT INST OF METROLOGY CHINA
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