Undaria pinnatifida (Harvey) Suringar, native to north-western Asia, is a prolific invasive seaweed species that has established across much of New Zealand, competing and co-existing with native seaweed species. Remote sensing could be used to map both invasive and native seaweeds in New Zealand. The aim of this study is to evaluate the hyperspectral differences (and the wavelengths at which they differ) between New Zealand seaweed species at broad taxonomic levels and also between Undaria pinnatifida and other common New Zealand seaweeds. ASD Handheld2 VNIR spectroradiometer with a spectral range of 325 to 1075 nm was used to collect hyperspectral data of the common New Zealand native and invasive seaweed species. Two supervised classification methods such as partial least-square discriminant analysis (PLS-DA) for wavelength selection/classification and random forest for validating the results from PLS-DA were implemented. The seaweed species were separable at broad taxonomic level with accuracies greater than 85% for all three taxonomic groups using PLS-DA. The influential wavelengths in discrimination were 572, 633 to 635, 640, 657 to 661, 687, 704 to 714, 741, 742, 749, and 750 nm. Some of the influential wavelengths were consistent with pigment absorption peaks unique to red and brown seaweeds. Undaria pinnatifida showed differences from native brown seaweed species in the visible (574 nm) and near-infrared (716 to 721, 750 nm) region of the electromagnetic spectrum. It was classified with an accuracy of 97.7% and 90.7% using random forest and PLS-DA, respectively.

中文翻译：

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使用高光谱数据从入侵的裙带菜中区分出新西兰常见的本地海藻

Undaria pinnatifida（Harvey）Suringar，原产于亚洲西北部，是一种多产的入侵性海藻物种，已在新西兰大部分地区建立，与本土海藻物种竞争并共存。遥感可用于绘制新西兰的侵入性海藻和原生海藻的地图。这项研究的目的是评估宽泛分类学水平下新西兰海藻物种之间以及裙带菜和其他常见新西兰海藻之间的高光谱差异（以及它们之间的波长差异）。ASD Handheld2 VNIR光谱仪的光谱范围为325至1075 nm，用于收集新西兰常见的本地和入侵海藻物种的高光谱数据。实施了两种监督分类方法，例如用于波长选择/分类的部分最小二乘判别分析（PLS-DA）和用于验证PLS-DA结果的随机森林。使用PLS-DA，所有三个分类组的海藻种类在广泛的分类学水平上都是可分离的，其准确度均大于85％。辨别力的影响波长为572、633至635、640、657至661、687、704至714、741、742、749和750 nm。一些影响波长与红色和棕色海藻特有的色素吸收峰一致。裙带菜（Undaria pinnatifida）在电磁光谱的可见光（574 nm）和近红外光（716至721，750 nm）区域显示出与天然棕色海藻物种的差异。使用随机森林和PLS-DA对它进行分类的准确率分别为97.7％和90.7％，