干旱区生态环境知识资源中心(Arid): Comparison of Hyperspectral Versus Traditional Field Measurements of Fractional Ground Cover in the Australian Arid Zone

Arid

DOI	10.3390/rs11232825
	Comparison of Hyperspectral Versus Traditional Field Measurements of Fractional Ground Cover in the Australian Arid Zone
	Fisk, Claire; Clarke, Kenneth D.; Lewis, Megan M.
通讯作者	Fisk, Claire
来源期刊	REMOTE SENSING
EISSN	2072-4292
出版年	2019
卷号	11 期号:23
英文摘要	The collection of high-quality field measurements of ground cover is critical for calibration and validation of fractional ground cover maps derived from satellite imagery. Field-based hyperspectral ground cover sampling is a potential alternative to traditional in situ techniques. This study aimed to develop an effective sampling design for spectral ground cover surveys in order to estimate fractional ground cover in the Australian arid zone. To meet this aim, we addressed two key objectives: (1) Determining how spectral surveys and traditional step-point sampling compare when conducted at the same spatial scale and (2) comparing these two methods to current Australian satellite-derived fractional cover products. Across seven arid, sparsely vegetated survey sites, six 500-m transects were established. Ground cover reflectance was recorded taking continuous hyperspectral readings along each transect while step-point surveys were conducted along the same transects. Both measures of ground cover were converted into proportions of photosynthetic vegetation, non-photosynthetic vegetation, and bare soil for each site. Comparisons were made of the proportions of photosynthetic vegetation, non-photosynthetic vegetation, and bare soil derived from both in situ methods as well as MODIS and Landsat fractional cover products. We found strong correlations between fractional cover derived from hyperspectral and step-point sampling conducted at the same spatial scale at our survey sites. Comparison of the in situ measurements and image-derived fractional cover products showed that overall, the Landsat product was strongly related to both in situ methods for non-photosynthetic vegetation and bare soil whereas the MODIS product was strongly correlated with both in situ methods for photosynthetic vegetation. This study demonstrates the potential of the spectral transect method, both in its ability to produce results comparable to the traditional transect measures, but also in its improved objectivity and relative logistic ease. Future efforts should be made to include spectral ground cover sampling as part of Australia's plan to produce calibration and validation datasets for remotely sensed products.
英文关键词	calibration ground cover hyperspectral spectral unmixing validation
类型	Article
语种	英语
国家	Australia
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000508382100106
WOS关键词	SPECTRAL MIXTURE ANALYSIS ; ESSENTIAL CLIMATE VARIABLES ; LAND-COVER ; SPATIAL-PATTERNS ; GEOV1 LAI ; VEGETATION ; SOIL ; CLASSIFICATION ; VALIDATION ; PRODUCTS
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
EI主题词	2019-12-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311241
作者单位	Univ Adelaide, Sch Biol Sci, Adelaide, SA 5005, Australia
推荐引用方式 GB/T 7714	Fisk, Claire,Clarke, Kenneth D.,Lewis, Megan M.. Comparison of Hyperspectral Versus Traditional Field Measurements of Fractional Ground Cover in the Australian Arid Zone[J],2019,11(23).
APA	Fisk, Claire,Clarke, Kenneth D.,&Lewis, Megan M..(2019).Comparison of Hyperspectral Versus Traditional Field Measurements of Fractional Ground Cover in the Australian Arid Zone.REMOTE SENSING,11(23).
MLA	Fisk, Claire,et al."Comparison of Hyperspectral Versus Traditional Field Measurements of Fractional Ground Cover in the Australian Arid Zone".REMOTE SENSING 11.23(2019).