Method for calculating diameter of any height of tree by angles and distances of three points
A three-point measurement and height technology, applied in the field of forest resources investigation, can solve the problems of waste of wood resources, many restrictive conditions, and complicated operation, and achieve the effect of improving the degree of automation, improving accuracy and improving work efficiency.
Inactive Publication Date: 2014-05-28
BEIJING FORESTRY UNIVERSITY
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[0002] Tree diameter is one of the important basic information of forest surveys. Determination of these data by traditional methods will bring us inconveniences such as many restrictions, cumbersome operations and even difficulty in measurement.
At present, there is a large demand for timber in our country, and a large amount of forest felling is needed to provide timber. Some trees that have not reached the timber specifications are also felled together. The main reason is that the small head diameter required for timber cannot be effectively determined, resulting in waste of timber resources. The damage to our country's forest resources is too great, which is not in line with our purpose of protecting the ecological environment and achieving sustainable development
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[0014] First, use the instrument to aim at the standing tree to be measured, and measure the slant distance S of any three points at the horizontal position along the trunk of the standing tree to be measured. 1 , S 2 , S 3 , Azimuth T 1 ,T 2 ,T 3 and inclination α 1 , α 2 , α 3 ; Secondly, utilize digital model to calculate horizontal distance L and calculate three relative coordinates A (x1, y1), B (x2, y2), C (x3, y3); then utilize three-point coordinates to determine this height trunk center coordinate O; Finally, the diameter of the tree at this height is calculated by numerical simulation. Specific steps are as follows:
[0015] (1) Set up the instrument, set it as the coordinate origin, and aim at the horizontal position at any height of the trunk of the standing tree to be measured to determine the observation target;
[0016] (2) Use an instrument to measure the slope distance S of any three points at the height 1 , S 2 , S 3 , azimuth T 1 ,T 2 ,T 3 and...
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The invention discloses a method for calculating the diameter of any height of a tree by angles and distances of three points. The invention relates to a method for investigating forest resources, belonging to the method for calculating the diameter of the tree in a far place or a part which can not be reached. The method is characterized by comprising the following steps: firstly, collimating a standing tree to be detected by using an instrument; measuring inclined distances S1, S2 and S3, azimuth angles T1, T2 and T3, and inclined angles alpha 1, alpha 2 and alpha 3 of any three points of the height along the horizontal position of the any height of the standing tree to be detected; secondly, calculating a horizontal distance L by using digital analogy and calculating relative coordinates A (x1,y1), B (x2,y2) and C (x3,y3) of the three points; then, determining a central coordinate O of the tree with the height by using the coordinates of the three points; and finally, calculating the diameter of the tree of the height by the digital analogy. According to the method, the characteristics of high instrument precision and capability of flexibly and remotely obtaining measured data are sufficiently utilized to reduce the difficulty and the cost of field investigation and improve the utilization rate of the forest resources, thus providing theoretical foundation and data support to forestry cutting. An experiment shows that the diameter of any part can be accurately obtained.
Description
1. Technical field [0001] The invention relates to a method for investigating forest resources, in particular to a method for measuring and calculating the diameter of a tree at any height at an angular distance from three points. 2. Technical Background [0002] Tree diameter is one of the important basic information of forest surveys. Determination of these data by traditional methods will bring us many inconveniences such as many restrictions, cumbersome operations and even difficulty in measurement. At present, there is a large demand for timber in our country, and a large amount of forest felling is required to provide timber. Some trees that do not meet the specifications of finished timber are also felled together. The main reason is that the diameter of the small head required for timber cannot be effectively determined, resulting in waste of timber resources. The damage to our country's forest resources is too great, which is not in line with our purpose of protecti...
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IPC IPC(8): G01B5/08G01B21/10
Inventor 冯仲科高超曹忠
Owner BEIJING FORESTRY UNIVERSITY