Welcome to visit Scientia Silvae Sinicae,Today is

Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (5): 130-139.doi: 10.11707/j.1001-7488.20210512

Previous Articles     Next Articles

Design and Experiment of Three-Stage Measurement Method and Device for Tree DBH

Linhao Sun1,2,Weisong Weng3,Luming Fang1,2,*,Junjun Ren1,2   

  1. 1. School of Information Engineering, Zhejiang A&F University Hangzhou 311300
    2. Zhejiang Provincial Key Laboratory of Forestry Intelligent Monitoring and Information Technology Hangzhou 311300
    3. Forest Resources Monitoring Center of Zhejiang Province Hangzhou 310020
  • Received:2019-07-16 Online:2021-05-25 Published:2021-07-09
  • Contact: Luming Fang

Abstract:

Objective: Presently, during the diameter at breast height(DBH)measuring process of nation continuous forest inventory, there are some shortages such as poor applicability, complex operation and low efficiency, and calipers are poor portability and short range. In order to solve the actual work needs of forestry surveyors, an efficient, accurate, portable tree DBH measurement device with integrated automatic reading, recording and uploading functions was expected to be designed. Method: A new DBH measurement method and device based on three-segment arms and two angle sensors was designed in this study, and the effectiveness of the device had also been evaluated in experiments. Result: 1) The results showed that 200 measurements of 15 cylinders had a 0.19 cm(0.79%)mean absolute deviation(MAE)and a 0.25 cm(0.94%)root mean square error(RMSE). 2) The results showed that measuring 218 trees of different diameter classes had a 0.22 cm(0.89%)mean absolute deviation(MAE)and a 0.42 cm(1.23%)root mean square error(RMSE). 3) The average measuring time of each tree was 8.67 s from the efficiency test in a 83-tree sample plot. Conclusion: The device developed by this paper may be advantageous to simple mechanical and electrical structure, suitable for big tree measurement, foldable design, convenient to carry and keep, simple operation and high efficiency, and be more suitable for measurement of large trees and realized the integration of measuring, uploading and inputting of DBH data, which would be accorded with the survey accuracy standard of continuous forest inventory.

Key words: diameter at breast height(DBH), three-stage, angle sensor

CLC Number: