Identifying invasive weed species in alpine vegetation communities based on spectral profiles

Chad Ajamian, Hsing-Chung Chang*, Kerrie Tomkins, Will Farebrother, Rene Heim, Shahriar Rahman

*Corresponding author for this work

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    Abstract

    This study examined the use of hyperspectral profiles for identifying three selected weed species in the alpine region of New South Wales, Australia. The targeted weeds included Orange Hawkweed, Mouse-ear Hawkweed and Ox-eye daisy, which have caused a great concern to regional biodiversity and health of the environment in Kosciuszko National Park. Field surveys using a spectroradiometer were undertaken to measure the hyperspectral profiles of leaves and flowers of the selected weeds and companion native plants. Random Forest (RF) classification was then applied to distinguish which spectral bands would differentiate the weeds from the native plants. Our results showed that an accuracy of 95% was achieved if the spectral profiles of the distinct flowers of the weeds were considered, and an accuracy of 80% was achieved if only the profiles of the leaves were considered. Emulation of the spectral profiles of two multispectral sensors (Sentinel-2 and Parrot Sequoia) was then conducted to investigate whether classification accuracy could potentially be achieved using wider spectral bands.
    Original languageEnglish
    Pages (from-to)177-191
    Number of pages15
    JournalGeomatics
    Volume1
    Issue number2
    DOIs
    Publication statusPublished - Jun 2021

    Bibliographical note

    Copyright the Author(s) 2021. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • weeds management
    • ox-eye daisy
    • orange hawkweed
    • mouse-ear hawkweed
    • hyperspectralremote sensing
    • multispectral
    • random forest
    • Kosciuszko National Park

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