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Article: Imprimé

UAV and field hyperspectral imaging for Sphagnum discrimination and vegetation modelling in Finnish aapa mires / Franziska Wolff in International journal of applied earth observation and geoinformation, 134 (2024)

article (2024)

[article]
inInternational journal of applied earth observation and geoinformation > 134 (2024)

Titre :	UAV and field hyperspectral imaging for Sphagnum discrimination and vegetation modelling in Finnish aapa mires
Type de document :	Imprimé
Auteurs :	Franziska Wolff ; Sandra Lorenz ; Pasi Korpelainen ; Anette Etner ; Timo Kumpula
Année de publication :	2024
Langues :	Anglais (eng)
Catégories :	[CBNPMP-Thématique] Télédétection
Mots-clés :	Sphagnum
Résumé :	Detailed knowledge of vegetation patterns allows to evaluate mire ecosystems and their dynamics. The use of hyperspectral information has the benefits of exploring spectral characteristics of species and vegetation modelling. Our study employed multi-scale and multi-source hyperspectral imaging with a handheld camera in the field and an UAV (Unoccupied Aerial Vehicle) sensor covering the wavelengths of 400 – 1000 nm. Plot-level spectra acquired with a UAV and field spectra collected at 1 m height were combined to develop a spectral library for Sphagnum moss species. This library was then used to map dominant Sphagnum species in a Finnish Aapa mire complex using the Spectral Angle Mapper (SAM) classifier. Classification performance assessment was supported by calculating a water index from the UAV-information. Additionally, we examined the transferability of sitespecific spectral libraries to an aapa mire with similar vegetation. The results showed little spectral variation in the plot spectrum between the sensors. A fusion of species- and plot-level libraries yielded the highest accuracy of 62 %. For both mires, there was a great variation among the class accuracies. Floating mosses had an accuracy of 86 %, followed by lawn-forming Sphagnum balticum with 77 %. For the test site, the latter species was mapped with an accuracy of 59 %. Red moss species achieved low accuracies of 45 % and 38 %, likely due to effects from sub-pixel and mixed-pixel effects of neighbouring graminoid species and the presence of litter. This might have also enhanced the contrast of adjacent pixels contributing to spectral alterations. Water table depth measurements and the water index revealed a hydrological preference for most species, with classification performance notably improving with higher water index values. We recommend collecting on-site hyperspectral information at varying hydrological circumstances to build a comprehensive spectral library for mire vegetation and modelling.
Lien pérenne :	DOI : 10.1016/j.jag.2024.104201
Permalink :	https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155065

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