A technical method for determining the distribution of forest disaster status from horizontal upright photographic images
A state distribution and forest technology, applied to the interpretation of photos, etc., can solve problems such as low technical accuracy, difficult data acquisition, and poor real-time performance, and achieve the effects of simple calculation, low estimated cost, and short time consumption
Active Publication Date: 2020-09-18
BEIJING FORESTRY UNIVERSITY
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[0006] In order to improve the shortcomings of traditional forest disaster distribution state estimation techniques such as low precision, poor real-time performance and difficult data acquisition, the purpose of this invention is to provide a technical method for measuring the distribution of forest disaster state through horizontal upright photographic images
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[0020] Compared with the original method for measuring the distribution of forest disaster states with horizontal upright photographic images, a method for measuring the distribution of forest disaster states has made great improvements and innovations in operation methods and calculations. The implementation is described in further detail:
[0021] (1) Taking the small class as a unit, take horizontal and upright photography of each small class in the affected forest (record the focal length as f), and measure the diameter at breast height d of the trees in the photos ij and count i;
[0022] (2) Classify the damaged forest: record disease as A; insect pest as B; wild animal as C; weather as D; Severe grade is grade 3, death is grade 4;
[0023] (3) Measure the trees in the photos taken, and record the number of trees as i (i=1,2,...n), and the tree species as j (j=1 for coniferous leaves, j=2 for broad leaves), DBD ij , the damage classification K (one-level note K=1, tw...
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The invention discloses a technical method for determining the distribution of forest disaster statuses via images acquired through horizontal and normal-case photography. The technical method comprises the following steps: selecting an appropriate camera as a shooting device; with a small-sized class as a unit, carrying out horizontal and normal-case photography on each small-sized class in an affected forest and separately measuring the diameter at breast height of trees in the shot photographs; recording the sequence numbers, varieties, diameters at breast height and affected levels of counted trees; and separately calculating the tree densities and stand volumes of different tree varieties and different affected levels, total tree density N, total stand volume M and the respective percentages of trees of different affected levels in the total tree density and the total stand volume by using numerical expressions.
Description
[0001] 1. Technical field [0002] The invention relates to a technical method for measuring the distribution of forest disaster states, in particular to a technical method for measuring the distribution of forest disaster states with horizontal and upright photographic images. [0003] 2. Technical Background [0004] The traditional technical method of determining the distribution of forest disaster status is to conduct a survey of each tree in the forest sample plot, and the internal and external inspection calculations need to spend a lot of manpower and material resources, and will also cause problems such as low work efficiency, low precision, and incomplete statistics. . However, with the rapid development of photogrammetry technology in recent years, using cameras to shoot in forest plots can quickly determine the state distribution of damaged trees, making it simple and fast, with high real-time performance, and greatly improving data acquisition. improvement. Theref...
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IPC IPC(8): G01C11/04
CPCG01C11/04
Inventor 冯仲科郭佳琪邱梓轩
Owner BEIJING FORESTRY UNIVERSITY