Method for calculating tree crown surface area based on three-dimensional laser scanning data

Abstract

The invention discloses a method for calculating tree crown surface area based on three-dimensional laser scanning data. According to the method, voxel treatment of tree point cloud data acquired by athree-dimensional laser scanner are performed by the three-dimensional laser scanner, voxels are projected onto a horizontal plane, the number of independent edges of all layers is counted, summed and then multiplied with the areas of the voxels to obtain the tree crown surface area. According to the method, field investigation cost is reduced by the aid of characteristics of flexibility and highefficiency of the three-dimensional laser scanner, the efficiency and the accuracy of field operation and indoor treatment of the volume and the area of a tree crown are improved, and the method overcomes the shortcomings that a past method causes high damage to a forest and is high in cost.

Description

1. Technical field [0001] The invention relates to a method for investigating forest resources, in particular to a method for calculating the surface area of ​​tree crowns based on three-dimensional laser scanning data. 2. Technical Background [0002] As an important basic factor of tree productivity, the surface area of ​​the tree crown directly affects the nutrient absorption, photosynthesis, water retention function of the tree and reflects the health of the tree. It is one of the most important factors to measure the biological characteristics and ecological functions of the tree crown. [0003] However, at present, the traditional method is often used to measure the surface area of ​​tree crowns at home and abroad, that is, to cut down a large number of standing trees as sample trees, and to calculate the volume by using the method of dividing and calculating the felled trees. In practice, the method of branch analysis sample trees is also commonly used. Investigate th...

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Problems solved by technology

[0004] ① The cost of the method is high;

[0005] ② The damage to the forest is large;

[0006] ③ The inversion model often has limitations due to differences in tree species and regions, which reduces the reliability of tree crown measurement technology

[0007] The above defects are all due to the fact that the basic connotation and investigation methods of crown surface area and crown volume have not received enough attention, and there are problems such as vague concepts and extensive calculation methods, which are difficult to meet the needs of forestry production and ecological construction with increasing standards.

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