A Method for Determining the Position of Stand Sample Trees Based on Three-Dimensional Laser Scanning of Stands
A technology of three-dimensional laser and method determination, which is applied in the field of forest stand investigation, and can solve the problems such as the inability to quickly locate the position of sample trees
Active Publication Date: 2022-04-22
NANJING FORESTRY UNIV
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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
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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. like 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 3*3...
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The invention discloses a ground-based three-dimensional laser scanning method for generating precise codes for forest stand survey samples, belonging to the field of forest stand surveys. The present invention aims at the problem that the sample number of the laser point cloud data obtained by scanning is difficult to determine when the current three-dimensional laser scanning of the ground is used for the investigation of the stand standard; when the tree factor comparison of the actual measured sample trees is carried out, the traditional digital labeling method cannot adapt In order to solve the problem of the labeling requirements of the sample trees in the stand standard land survey based on three-dimensional laser scanning of the ground, a method for generating accurate codes for the sample trees of the stand survey based on the three-dimensional laser scanning of the ground is proposed. Treat it as a dyed m×n grid; set the number of dyed grids as k; find the solution set S of the grid coloring and the number of elements |S| and the number of consumables in the solution set S that can be correctly identified; It can quickly determine the position of each sample tree in a single-stage or multi-stage stand standard plot, so as to meet the needs of comparative analysis of tree tree measurement factors for ground-based laser stand investigation.
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...
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IPC IPC(8): G01B11/00
CPCG01B11/00
Inventor 温小荣杨杰刘磊朱硕
Owner NANJING FORESTRY UNIV