Normal case photography forest metrology method through common digital camera

A digital camera, an honest technology, applied in measurement devices, instruments, optical devices, etc., can solve the problems of poor accuracy, long data acquisition cycle, low efficiency, etc., to achieve efficient measurement and reduce the intensity of measurement operations.

Inactive Publication Date: 2014-10-08
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0004] In order to overcome the disadvantages of long data acquisition period, low efficiency and poor precision in the traditional method of measuring tree diameter at breast height and tree height, improve efficiency and precision, and shorten the period, the purpose of the present invention is to provide a forest measurement method with an ordinary digital camera upright photography

Method used

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  • Normal case photography forest metrology method through common digital camera
  • Normal case photography forest metrology method through common digital camera
  • Normal case photography forest metrology method through common digital camera

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Embodiment Construction

[0014] (1) Under any terrain conditions, first select a 20×30 sample plot, and set a red and white equidistant flower pole at the farthest diagonal direction from the shooting point on the edge of the sample plot as the measurement reference object;

[0015] (2) Under the condition of ensuring horizontal and upright photography, use an ordinary digital camera to take a digital photo of the plot;

[0016] (3) Use the pixel coordinate measuring tool in the Photoshop software to obtain the image square coordinates of the bottom of the flower pole on the digital photo of the sample plot as (U 0 , V 0 ), under the condition that the focal length f and the flower stem height h are known, using the digital model X 0 = h V 0 U 0 ...

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Abstract

The invention discloses a normal case photography forest metrology method through a common digital camera. The method comprises the following steps: setting a sighting rod as a measurement reference object at a place which is farthest away from a shooting point on the sample plot edge under random topographic condition, and measuring two parameters, namely the diameter at breast height and the tree height of each sample tree in the sample plot by utilizing fixed focus horizontal normal case photography. According to the method, the defects that the data acquisition period is long, the efficiency is low and the precision is low in the traditional method for measuring the diameter at breast height and tree height of sample trees are overcome, the efficiency and precision are improved, and the period is shortened.

Description

1. Technical field [0001] The invention relates to a method for measuring forests with an ordinary digital camera upright photography, especially under any terrain conditions, using a fixed-focus level to take pictures, and realizing the measurement of the diameter at breast height and tree height of a sample tree in a sample plot with the assistance of setting flower poles. 2. Technical background [0002] DBH and tree height are two important tree-measurement factors in forest measurement. At present, DBH is measured manually with a DBH ruler, which belongs to contact measurement. Due to the influence of terrain and understory shrubs, the DBH of each sample tree in the sample plot is measured. It is time-consuming and labor-intensive, requiring one person to measure and one person to record, and the labor cost is high. The height of the tree is measured by an altimeter, and there are problems such as the difficulty of accurately judging the top of the treetop, resulting in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/04
CPCG01C11/04G01B11/02G01B11/08
Inventor 冯仲科杨立岩徐伟恒
Owner BEIJING FORESTRY UNIVERSITY
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