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    Author(s): Mason F. Patterson; P. Eric Wiseman; Matthew F. Winn; Sang-mook Lee; Philip A. Araman
    Date: 2011
    Source: Arboriculture & Urban Forestry 37(4):173-179
    Publication Series: Scientific Journal (JRNL)
    Station: Southern Research Station
    PDF: Download Publication  (598.41 KB)

    Description

    UrbanCrowns is a software program developed by the USDA Forest Service that computes crown attributes using a side-view digital photograph and a few basic field measurements. From an operational standpoint, it is not known how well the software performs under varying photographic conditions for trees of diverse size, which could impact measurement reproducibility and therefore software utility. Researchers evaluated the robustness of crown dimension computations made with UrbanCrowns for open-grown sugar maples (Acer saccharum) across a range of sizes from recently transplanted to full maturity. It was found that computations of both crown volume and density were highly repeatable across varying photographic distances. For the majority of tree size classes, crown volume and density varied less than 5% on average over distances ranging from 1.5× to 3.0× tree height; however, crown volume errors of 5%–10% were common for larger trees (>46 cm trunk diameter). UrbanCrowns calculations of crown volume showed strong agreement with calculations derived from equations for geometric solids, both in terms of precision (R2 = 0.9783) and accuracy (B1 = 1.0033). These findings suggest that UrbanCrowns has potential as an objective, reliable method for measuring tree crown attributes that are commonly assessed during urban forest inventories.

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    Citation

    Patterson, Mason F.; Wiseman, P. Eric; Winn, Matthew F.; Lee, Sang-mook; Araman, Philip A. 2011. Effects of photographic distance on tree crown atributes calculated using urban crowns image analysis software. Arboriculture & Urban Forestry 37(4):173-179.

    Keywords

    Crown Density, Crown Transparency, Crown Volume, Leaf Area, Tree Inventory, Tree Measurement, Tree Monitoring

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https://www.fs.usda.gov/treesearch/pubs/39433