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    Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Forestry following peer review. The definitive publisher-authenticated version Jon Murray, George Alan Blackburn, James Duncan Whyatt, Christopher Edwards; Using fractal analysis of crown images to measure the structural condition of trees, Forestry: An International Journal of Forest Research, Volume 91, Issue 4, 1 October 2018, Pages 480–491, https://doi.org/10.1093/forestry/cpy008 is available online at: https://academic.oup.com/forestry/article/91/4/480/4955779

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Using fractal analysis of crown images to measure the structural condition of trees

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>10/2018
<mark>Journal</mark>Forestry
Issue number4
Volume91
Number of pages12
Pages (from-to)480-491
Publication statusPublished
Early online date28/03/18
Original languageEnglish

Abstract

Observations of tree canopy structure are routinely used as an indicator of tree condition for the purposes of monitoring tree health, assessing habitat characteristics or evaluating the potential risk of tree failure. Trees are assigned to broad categories of structural condition using largely subjective methods based upon ground-based, visual observations by a surveyor. Such approaches can suffer from a lack of consistency between surveyors; are qualitative in nature and have low precision. In this study, a technique is developed for acquiring, processing and analysing hemispherical images of sessile oak (Quercus petraea (Matt.) Liebl.) tree crowns. We demonstrate that by calculating the fractal dimensions of tree crown images it is possible to define a continuous measurement scale of structural condition and to be able to quantify intra-category variance of tree crown structure. This approach corresponds with traditional categorical methods; however, we recognize that further work is required to precisely define interspecies thresholds. Our study demonstrates that this approach has the potential to form the basis of a new, transferable and objective methodology that can support a wide range of uses in arboriculture, ecology and forest science.

Bibliographic note

This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Forestry following peer review. The definitive publisher-authenticated version Jon Murray, George Alan Blackburn, James Duncan Whyatt, Christopher Edwards; Using fractal analysis of crown images to measure the structural condition of trees, Forestry: An International Journal of Forest Research, Volume 91, Issue 4, 1 October 2018, Pages 480–491, https://doi.org/10.1093/forestry/cpy008 is available online at: https://academic.oup.com/forestry/article/91/4/480/4955779