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Updated: Jul 13, 2025

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ExtSpecR: An R Package and Tool for Extracting Tree Spectra from UAV-Based Remote Sensing.

Zhuo Liu1,2, Mahmoud Al-Sarayreh3, Cong Xu4

  • 1State Key Laboratory of Tree Genetics and Breeding, Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, Zhejiang 311400, China.

Plant Phenomics (Washington, D.C.)
|October 18, 2023
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Summary

ExtSpecR is a new open-source tool that simplifies extracting spectral data from individual trees using unmanned aerial vehicle (UAV) imagery. This tool aids forestry research by automating tree detection and spectral analysis.

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Area of Science:

  • Forestry
  • Remote Sensing
  • Plant Phenomics

Background:

  • Unmanned aerial vehicle (UAV) remote sensing is crucial for high-throughput phenomics in forestry.
  • Individual tree detection and spectral data extraction from UAV imagery are challenging and often manual.
  • Existing software solutions lack widespread adoption in forestry research.

Purpose of the Study:

  • To introduce ExtSpecR, an open-source tool for spectral extraction from single trees using UAV data.
  • To provide an easy-to-use, interactive web application for forestry researchers.
  • To simplify and accelerate the extraction of spectral and spatial features from UAV-based imagery.

Main Methods:

  • Development of ExtSpecR, an open-source tool with an interactive web application.
  • Implementation of automated single tree detection and annotation functionalities.
  • Integration of interactive dashboards for maximizing data quality and feature extraction.

Main Results:

  • ExtSpecR significantly reduces the time and effort required for single tree detection and spectral data annotation.
  • The tool simplifies the entire process of spectral and spatial feature extraction from UAV imagery.
  • Interactive dashboards enhance the quality of information derived from UAV data.

Conclusions:

  • ExtSpecR promotes the practical application of UAV remote sensing in forest ecology and tree breeding research.
  • The tool facilitates a deeper understanding of the relationships between tree growth and physiological traits.
  • ExtSpecR is poised to increase the adoption and utility of UAV data in forestry research.