Arid
DOI10.1007/s10661-013-3486-7
Detecting new Buffel grass infestations in Australian arid lands: evaluation of methods using high-resolution multispectral imagery and aerial photography
Marshall, V. M.; Lewis, M. M.; Ostendorf, B.
通讯作者Marshall, V. M.
来源期刊ENVIRONMENTAL MONITORING AND ASSESSMENT
ISSN0167-6369
EISSN1573-2959
出版年2014
卷号186期号:3页码:1689-1703
英文摘要

We assess the feasibility of using airborne imagery for Buffel grass detection in Australian arid lands and evaluate four commonly used image classification techniques (visual estimate, manual digitisation, unsupervised classification and normalised difference vegetation index (NDVI) thresholding) for their suitability to this purpose. Colour digital aerial photography captured at approximately 5 cm of ground sample distance (GSD) and four-band (visible-near-infrared) multispectral imagery (25 cm GSD) were acquired (14 February 2012) across overlapping subsets of our study site. In the field, Buffel grass projected cover estimates were collected for quadrates (10 m diameter), which were subsequently used to evaluate the four image classification techniques. Buffel grass was found to be widespread throughout our study site; it was particularly prevalent in riparian land systems and alluvial plains. On hill slopes, Buffel grass was often present in depressions, valleys and crevices of rock outcrops, but the spread appeared to be dependent on soil type and vegetation communities. Visual cover estimates performed best (r (2) 0.39), and pixel-based classifiers (unsupervised classification and NDVI thresholding) performed worst (r (2) 0.21). Manual digitising consistently underrepresented Buffel grass cover compared with field- and image-based visual cover estimates; we did not find the labours of digitising rewarding. Our recommendation for regional documentation of new infestation of Buffel grass is to acquire ultra-high-resolution aerial photography and have a trained observer score cover against visual standards and use the scored sites to interpolate density across the region.


英文关键词Remote sensing Aerial photography High resolution Invasive species Natural resource management Cenchrus ciliaris Pennisetum ciliare
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000330715300029
WOS关键词PENNISETUM-CILIARE ; CENCHRUS-CILIARIS ; VEGETATION ; L. ; CONVERSION ; INVASIONS ; UPLAND
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181917
作者单位Univ Adelaide, Sch Earth & Environm Sci, Glen Osmond, SA, Australia
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Marshall, V. M.,Lewis, M. M.,Ostendorf, B.. Detecting new Buffel grass infestations in Australian arid lands: evaluation of methods using high-resolution multispectral imagery and aerial photography[J],2014,186(3):1689-1703.
APA Marshall, V. M.,Lewis, M. M.,&Ostendorf, B..(2014).Detecting new Buffel grass infestations in Australian arid lands: evaluation of methods using high-resolution multispectral imagery and aerial photography.ENVIRONMENTAL MONITORING AND ASSESSMENT,186(3),1689-1703.
MLA Marshall, V. M.,et al."Detecting new Buffel grass infestations in Australian arid lands: evaluation of methods using high-resolution multispectral imagery and aerial photography".ENVIRONMENTAL MONITORING AND ASSESSMENT 186.3(2014):1689-1703.
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