文章基本信息

标题：Seasonal Spectral Separation of Western Snowberry and Wolfwillow in Grasslands with Field Spectroradiometer and Simulated Multispectral Bands
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作者：Irini Soubry ; Xulin Guo
期刊名称：Environments
电子版ISSN：2076-3298
出版年度：2021
卷号：8
期号：7
页码：60
DOI：10.3390/environments8070060
出版社：MDPI Publishing
摘要：Woody plant encroachment (WPE), the expansion of native and non-native trees and shrubs into grasslands, has led to degradation worldwide. In the Canadian prairies, western snowberry and wolfwillow shrubs are common encroachers, whose cover is currently unknown. As the use of remote sensing in grassland monitoring increases, opportunities to detect and map these woody species are enhanced. Therefore, the purpose of this study is to identify the optimal season for detection of the two shrubs, to determine the sensitive wavelengths and bands that allow for their separation, and to investigate differences in separability potential between a hyperspectral and broadband multispectral approach. We do this by using spring, summer, and fall field-based spectra of both shrubs for the calculation of spectral separability metrics and for the simulation of broadband spectra. Our results show that the summer offers higher discrimination between the two species, especially when using the red and blue spectral regions and to a lesser extent the green region. The fall season fails to provide significant spectral separation along the wavelength spectrum. Moreover, there is no significant difference in the results from the hyperspectral or broadband approach. Nevertheless, cross-validation with satellite imagery is needed to confirm the current results.
关键词：western snowberry; Symphoricarpos occidentalis ; wolfwillow; Elaeagnus commutata ; spectral separability; seasonal variation; grassland; woody plant encroachment western snowberry ; Symphoricarpos occidentalis ; wolfwillow ; Elaeagnus commutata ; spectral separability ; seasonal variation ; grassland ; woody plant encroachment