A method for obtaining forest canopy parameters of plantation forests using two-dimensional images

A two-dimensional image and plantation technology, applied in image data processing, instrumentation, surveying and mapping, and navigation, etc., can solve problems such as incomplete canopy information acquisition, shorten field measurement time, improve measurement accuracy, and improve accuracy and efficiency. Effect

Active Publication Date: 2021-09-21
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0006] In order to solve the problem of incomplete acquisition of canopy information when using close-range photogrammetry technology for data acquisition in a high-density forest environment, the purpose of this invention is to provide a new canopy parameter estimation based on a 3D reconstruction model constructed from close-range photogrammetry data method

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  • A method for obtaining forest canopy parameters of plantation forests using two-dimensional images
  • A method for obtaining forest canopy parameters of plantation forests using two-dimensional images
  • A method for obtaining forest canopy parameters of plantation forests using two-dimensional images

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Embodiment Construction

[0016] The present invention: a method for acquiring high-density plantation forest canopy parameters using a two-dimensional image, said method comprising the following steps:

[0017] Step 1: Use close-range photogrammetry equipment to take pictures clockwise around the target area with a fixed step, check the quality of the pictures in time, and require the subject to be clear;

[0018] Step 2: Use the sequence of photos taken to reconstruct the 3D point cloud to obtain the 3D point cloud model of the target plot;

[0019] Step 3: Use the seven-parameter transformation model to transform the reconstructed point cloud data into three-dimensional coordinates from relative space coordinates to earth space Cartesian coordinates. Suppose A(Xa,Ya,Za) is the coordinates of the known coordinate system, and B(Xb,Yb,Zb) is the coordinates of the undetermined coordinate system, then:

[0020]

[0021] Among them, Tx, Ty, Tz are three translation parameters, m is a scale parameter,...

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Abstract

The invention discloses a method for obtaining forest canopy parameters of artificial forests by using two-dimensional images, which is suitable for the investigation of artificial forest resources and belongs to the technical field of photogrammetry in forestry applications. The key technical points include: 1. Extracting the tree point cloud model Useful information; 2. Use a specific method to extract information about the relative relationship between trees; 3. Use a specific estimation method to calculate the tree canopy parameters in the target area. The key problems to be solved include: 1. Only need to take pictures of the forest land to obtain the sample plot information, reduce the workload of the ground survey and improve the survey efficiency; 2. Solve the problem that close-range photogrammetry cannot obtain high-density forest environment forest canopy due to the occlusion of forest branches and leaves information problem. The invention is suitable for plantations in high-density forest environments, and it is the first time to use the method of combining photogrammetry technology and crown width estimation method to extract single-tree canopy information of high-density forest environment plantation forests. The results can provide basic data basis for rapid and accurate investigation of plantation forest resources.

Description

1. Technical field [0001] The invention relates to a method for estimating forest canopy parameters of plantation forests in the intersecting field of close-range photogrammetry and forest resource investigation, which is suitable for obtaining forest diameter diameter parameters of high-density plantation forests, and belongs to the technical field of close-range photogrammetry in forestry applications. [0002] 2. Technical Background [0003] Canopy width is an important single tree parameter in forest resource survey. Compared with traditional surveying methods, forest resource surveys by close-range photogrammetry can improve survey efficiency, reduce labor costs, and reduce survey workload. The tree canopy parameters can be extracted by measuring the reconstructed single tree point cloud model by using close-range photogrammetry technology. However, in a high-density forest environment, using close-range photogrammetry technology, due to the serious occlusion of branch...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/00G06T17/20
CPCG01C11/00G06T17/20
Inventor 张晓丽郑宇风郭正齐赵霖朱若柠李霓雯
Owner BEIJING FORESTRY UNIVERSITY
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