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Forest stand survey sample wood accurate code generation method based on Foundation three-dimensional laser scanning

A three-dimensional laser and forest stand technology, applied in the field of forest stand investigation, can solve the problem of inability to quickly locate the position of sample trees

Active Publication Date: 2021-06-01
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the current ground-based 3D laser scanning data extraction technology cannot visually compare the multi-period standards to find some trees that meet the researchers' specific requirements (such as felling, dead, diseased, or being competed), and cannot quickly locate their location in the standard area. Sample location

Method used

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  • Forest stand survey sample wood accurate code generation method based on Foundation three-dimensional laser scanning
  • Forest stand survey sample wood accurate code generation method based on Foundation three-dimensional laser scanning
  • Forest stand survey sample wood accurate code generation method based on Foundation three-dimensional laser scanning

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Embodiment 1

[0027] In the point cloud data, only the reflection sheet on the reflection image can be clearly interpreted, and the 3*3-dimensional nine-square grid behind it is invisible. In this way, the data obtained by ground-based three-dimensional laser scanning for two codes with similar geometric features will be the same. Such as Figure 1-Figure 2 as shown, figure 2 for figure 1 The actual scan renderings, figure 1 The number shown in (e) has 4 situations in the 3*3-dimensional nine-square grid, among which figure 1 (a), figure 1 (b) is two of them, and the other two are figure 1 (a) The stained area is simultaneously shifted down one grid to form figure 1 (c) and figure 1 (b) The dyed area is moved up one grid at the same time figure 1 (d). When there are many objects to be tested, it is necessary to calculate how many situations where the reflective sheet placed in the 3*3-dimensional nine-square grid can be correctly identified at most. In the present invention, the ...

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Abstract

The invention discloses a forest stand survey sample wood accurate code generation method based on foundation three-dimensional laser scanning, and belongs to the field of forest stand survey. The method aims at solving the problem that the sample wood number of laser point cloud data obtained through scanning is difficult to determine when forest stand standard land investigation is carried out through foundation three-dimensional laser scanning at present. The invention provides the forest stand survey sample wood accurate code generation method based on foundation three-dimensional laser scanning, and aims to solve the problem that a traditional digital labeling method cannot adapt to sample wood labeling requirements of forest stand standard plot survey through foundation three-dimensional laser scanning when actual measurement sample wood tree measurement factors are compared. According to the method, m x n grids with light reflecting sheets are regarded as dyed m x n grids; the number of dyed grids is set to be k; a solution set S of grid dyeing, and the number |S| of elements and the number N of consumables in the solution set S under the condition that the elements can be correctly identified are solved; the method can quickly determine the position of each sample tree in a single-stage or multi-stage forest stand standard land so as to meet the requirements of forest tree measurement factor contrastive analysis of forest stand survey by foundation laser.

Description

technical field [0001] The invention belongs to the field of forest stand investigation, and in particular relates to a method for generating precise codes of forest stand survey sample trees based on three-dimensional laser scanning. Background technique [0002] When the ground-based 3D laser scanning is used to investigate the stand standard plot, it is necessary to label the sample trees of the stand standard plot. The traditional digital labeling method cannot be adapted to the ground-based 3D laser scanning because it cannot distinguish the corresponding numbers of the trees in the mosaic data of multiple sites. Requirements for labeling of sample trees in forest stand standard surveys. In addition, the current ground-based 3D laser scanning data extraction technology cannot visually compare the multi-period standards to find some trees that meet the researchers' specific requirements (such as felling, dead, diseased, or being competed), and cannot quickly locate their...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
CPCG01B11/00
Inventor 温小荣杨杰刘磊朱硕
Owner NANJING FORESTRY UNIV
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