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Dry Biomass Estimation of Hedge Banks: Allometric Equation vs. Structure from Motion via Unmanned Aerial Vehicle

Author

Listed:
  • Stefan LINGNER

    (Institute of Agricultural Engineering, University of Kiel, Kiel, Germany)

  • Eiko THIESSEN

    (Institute of Agricultural Engineering, University of Kiel, Kiel, Germany)

  • Kerrin MÜLLER

    (Institute for Natural Resource Conservation, University of Kiel, Kiel, Germany)

  • Eberhard HARTUNG

    (Institute of Agricultural Engineering, University of Kiel, Kiel, Germany)

Abstract

The wood yield of hedge banks is very heterogeneous and hard to estimate in advance. The aim of the present study was to estimate the dry biomass of hedge banks shortly before harvesting using two different non-destructive approaches: (i) allometric equation based on DBH, (ii) volume calculations based on Structure from Motion; and to compare these estimations to the results of the (invasive) reference method: weighing after harvesting. Study objects were three different 100 m hedge banks in Schleswig-Holstein, Germany that were divided into 10 m segments (n = 30). These segments were harvested and weighed separately to calculate dry biomass. The allometric equation yielded a relative root mean square error (rRMSE) of 32.4%. The Structure from Motion (SfM) volume models yielded an rRMSE of 30.0%. These results indicate that SfM approaches are comparably precise to allometric equations for dry mass estimations of hedge banks. SfM approaches are less time consuming but have higher technical requirements.

Suggested Citation

  • Stefan LINGNER & Eiko THIESSEN & Kerrin MÜLLER & Eberhard HARTUNG, 2018. "Dry Biomass Estimation of Hedge Banks: Allometric Equation vs. Structure from Motion via Unmanned Aerial Vehicle," Journal of Forest Science, Czech Academy of Agricultural Sciences, vol. 64(4), pages 149-156.
    • Handle: RePEc:caa:jnljfs:v:64:y:2018:i:4:id:152-2017-jfs
    DOI: 10.17221/152/2017-JFS
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    References listed on IDEAS

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    1. Wickham, Hadley, 2011. "The Split-Apply-Combine Strategy for Data Analysis," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 40(i01).
    2. Wickham, Hadley, 2007. "Reshaping Data with the reshape Package," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 21(i12).
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    Cited by:

    1. Stefan LINGNER & Eiko THIESSEN & Eberhard HARTUNG, 2018. "Aboveground biomass estimation in linear forest objects: 2D- vs. 3D-data," Journal of Forest Science, Czech Academy of Agricultural Sciences, vol. 64(12), pages 523-532.

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