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Magnetic marking crown boundary vectorization method based on crown coding

A boundary vector and vectorization technology, applied in the field of forest tree recognition, can solve the problems of long time consumption, large amount of calculation, low calculation efficiency, etc., and achieve the effect of high calculation efficiency and time saving

Pending Publication Date: 2020-10-09
RES INST OF FOREST RESOURCE INFORMATION TECHN CHINESE ACADEMY OF FORESTRY
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Problems solved by technology

This method sequentially judges whether the grid unit is located within the vectorized tree crown boundary, and the amount of calculation increases geometrically; even if the spatial index is used to accelerate the determination of whether the grid unit is located within the vectorized tree crown boundary, a large number of calculations are still required. The calculation efficiency is very low and time-consuming

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  • Magnetic marking crown boundary vectorization method based on crown coding

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Embodiment Construction

[0038] The technical problems, technical solutions and advantages of the present invention will be explained in detail below by referring to exemplary embodiments. The exemplary embodiments described below are only for explaining the present invention, but not construed as limiting the present invention. Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have meanings consistent with their meaning in the context of the prior art and will not be used in an idealized or overly formal sense unless defined herein to explain.

[0039] Aiming at the problem of low efficiency and time-consuming process of canopy boundary vectorization in the current tree statistics and mon...

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Abstract

The invention provides a magnetic marking crown boundary vectorization method based on crown coding, and the method is used for solving the problem of low crown boundary vectorization efficiency in the prior art. According to the boundary vectorization method, on the basis of crown coding grid units, a crown marking grid layer is newly built, when crown coding of a current grid unit is effective and vectorization is not completed, as a seed point, a vectorized crown boundary is obtained, then magnetic marking is conducted on the grid units within the boundary range, and magnetically-marked crown grid units are obtained. The method does not depend on crown vertex information; the establishment of a spatial index is not required, whether the grid units are located in vectorized crown boundary or not does not need to be judged, the crown boundary vectorization can be rapidly achieved through magnetic force marking, along with the increase of the data size and linear increase of the operation time, the geometric increase cannot occur, the operation efficiency is high, the time is saved, and meanwhile, the method is suitable for the rapid vectorization of large-data-size grids.

Description

technical field [0001] The invention belongs to the field of tree identification, and in particular relates to a method for vectorizing the crown boundary of magnetic markers based on crown coding. Background technique [0002] In the survey of forest resources, it is necessary to count and monitor the number and survival status of trees in a certain area. Three-dimensional remote sensing technologies such as laser radar and photogrammetry can directly measure the spatial structure of the forest canopy, generate a canopy height model, and use the single tree segmentation algorithm to vectorize the tree canopy grid area, and divide the canopy height model into individual tree canopy areas , Effective statistics and monitoring of trees. To obtain a single canopy area, it is necessary to obtain the canopy vector boundary. [0003] In the prior art, there are usually crown vertex methods and non-tree crown vertex methods. Among them, the canopy vertex method is to traverse th...

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V20/188
Inventor 刘清旺田昕李增元庞勇李世明
Owner RES INST OF FOREST RESOURCE INFORMATION TECHN CHINESE ACADEMY OF FORESTRY
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