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Forest tree measurement method based on centrifugal observation and eccentricity correction under shielding condition

An eccentric, conditional technique for use in surveying devices, surveying instruments, height/level measurements, etc.

Inactive Publication Date: 2012-02-15
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0005] However, when measuring in a sample plot, it is often encountered that the measured tree is blocked. When the target tree is blocked, it is impossible to directly use the electronic angle gauge to measure

Method used

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  • Forest tree measurement method based on centrifugal observation and eccentricity correction under shielding condition
  • Forest tree measurement method based on centrifugal observation and eccentricity correction under shielding condition
  • Forest tree measurement method based on centrifugal observation and eccentricity correction under shielding condition

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Embodiment Construction

[0017] The vertical angle gauge uses the vertical angle as the viewing angle. Firstly, select the forest component goniometer point and set up the electronic solid goniometer. When the target tree is blocked, use the method of centrifugal observation and eccentricity correction to deviate from the measurement line of sight to observe the average height of the blocked forest stand, that is, when the target tree is blocked, Re-install the instrument at any angle and at any distance, and the target tree can be observed at the new corner gauge point, and the relevant data can be obtained by using the electronic cube corner gauge, recorded and calculated by the PDA in real time, and the value of tanβ can be obtained.

[0018] According to the existing measurement and calculation method, the tanβ value is compared with 1.772, and the number of counted trees can be judged in real time, which can be judged according to the following three situations: when tanβ>1.772, the count is 1, wh...

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Abstract

The invention discloses a forest tree measurement method based on centrifugal observation and eccentricity correction under the shielding condition, comprising the following steps of: when goal trees are shielded, using the centrifugal observation and eccentricity correction method to deflectedly measure visual observed goal trees and calculate the mean height and basal area of the forest stand; during the measurement of the forest stand mean height, reinstalling a device at the random distance L from any angle to the deflectedly measure vision by using an electronic angle gauge to measure level angle alpha, vertical angle beta1 and beta2, comparing the value of tanbeta with 1.772 to determine the number of the trees, and further calculating the mean height of the forest stand; during the measurement of the basal area, calculating the actual horizontal distance S from the trees to the angle gauge point, comparing the value of S with the fillet radius R of the trees to determine the number of the trees, and further calculating the basal area growth increment of the forest stand. The method provided by the invention is used to measure the tree height and the basal area growth increment by the centrifugal observation and eccentricity correction method under the shielding condition.

Description

1. Technical field [0001] The invention relates to how to deal with the case of being blocked in the process of tree measurement, and in particular proposes a centrifugal observation and eccentricity correction method to measure relevant data. 2. Technical background [0002] Angle gauge is a forest stand measurement tool composed of a certain angle of view. In 1947, the Austrian forest scientist Bitterlich W. first invented the theory and method of measuring the cross-sectional area per hectare of a forest stand with an angle gauge, breaking through more than 100 years of measuring the size of each tree on a certain area (standard plot or sample plot). The traditional method has greatly improved the efficacy. This important new discovery in the theory and method of tree measurement has attracted extensive attention and great interest of the world's tree measurement scientists. Over the past 40 years, after extensive application and further research in various countries in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/00G01C5/00
Inventor 冯仲科王永国刘德庆姚山
Owner BEIJING FORESTRY UNIVERSITY
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