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Related Experiment Videos

Measuring tree-ring increments on tree bole sections with a video-based robotic positioner.

R A Schmidt1, M R Kaufmann, L Porth

  • 1USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, CO 80526, USA.

Tree Physiology
|October 1, 1996
PubMed
Summary
This summary is machine-generated.

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This study introduces a new automated system for measuring tree-ring widths, significantly speeding up data collection for forest growth analysis. The system uses video imaging and computer control for precise radial increment measurements.

Area of Science:

  • Dendrochronology
  • Forestry Science
  • Image Analysis

Background:

  • Traditional tree-ring measurement using microscopes is time-consuming.
  • Accurate radial increment data is crucial for understanding tree volume growth and stand dynamics.
  • Old-growth ponderosa pine stands require efficient methods for assessing long-term growth patterns.

Purpose of the Study:

  • To develop and evaluate a system that accelerates the measurement of radial tree-ring increments.
  • To automate the process of measuring and recording annual growth from tree stem disks.
  • To enable faster acquisition of growth data from numerous samples for volume growth determination.

Main Methods:

  • A video imaging system integrated with a personal computer and a 3-axis positioning system replaced traditional microscopy.

Related Experiment Videos

  • Operators used a computer-driven mouse to select tree rings on a monitor, with the computer measuring and recording distances.
  • Menu-driven software facilitated task selection, data formatting, checking, and organization.

    • Main Results:

    • The system achieved measurement resolutions of 0.026 mm, with potential for finer resolution.
    • Measurement variability tests showed standard errors of 0.006 mm or less for individual operators.
    • Low correlation coefficients (as low as 0.66) among radii suggest single-radius measurements may not fully represent radial growth in older trees.

    Conclusions:

    • The developed system significantly speeds up tree-ring width measurement compared to traditional methods.
    • Automated measurement and recording enhance efficiency in dendrochronological studies.
    • The system's potential for automatic ring detection offers further advancements in tree growth analysis.