Arid
DOI10.1080/10106049.2013.868041
Estimating fractional land cover in semi-arid central Kalahari: the impact of mapping method (spectral unmixing vs. object-based image analysis) and vegetation morphology
Mishra, Niti B.; Crews, Kelley A.
通讯作者Mishra, Niti B.
来源期刊GEOCARTO INTERNATIONAL
ISSN1010-6049
EISSN1752-0762
出版年2014
卷号29期号:8页码:860-877
英文摘要

Focusing on the central Kalahari, this study utilized fractional cover of photosynthetic vegetation (f(PV)), non-photosynthetic vegetation (f(NPV)) and bare soil (f(BS)), derived in situ and estimated from GeoEye-1 imagery using Multiple End-member Spectral Mixture Analysis (MESMA) and object-based image analysis (OBIA) to determine superior method for fractional cover estimation and the impact of vegetation morphology on the estimation accuracy. MESMA mapped fractional cover by testing endmember models of varying complexity. Based on OBIA, image was segmented at five segmentation scales followed by classification. MESMA provided more accurate fractional cover estimates than OBIA. The increasing segmentation scale in OBIA resulted in a consistent increase in error. Different vegetation morphology types showed varied responses to the changing segmentation scale, reflecting their unique ecology and physiognomy. While areas under woody cover produced lower error even at coarse segmentation scales, those with herbaceous cover provided low error only at the fine segmentation scale.


英文关键词semi-arid savanna fractional cover MESMA Object-based image analysis GeoEye
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000340495700004
WOS关键词MIXTURE ANALYSIS ; NONPHOTOSYNTHETIC VEGETATION ; ENDMEMBER SELECTION ; SAVANNA ; CLASSIFICATION ; SCALE ; ENVIRONMENTS ; ENCROACHMENT ; COMMUNITIES ; ECOSYSTEMS
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
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/182211
作者单位Univ Texas Austin, Dept Geog & Environm, Austin, TX 78712 USA
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Mishra, Niti B.,Crews, Kelley A.. Estimating fractional land cover in semi-arid central Kalahari: the impact of mapping method (spectral unmixing vs. object-based image analysis) and vegetation morphology[J],2014,29(8):860-877.
APA Mishra, Niti B.,&Crews, Kelley A..(2014).Estimating fractional land cover in semi-arid central Kalahari: the impact of mapping method (spectral unmixing vs. object-based image analysis) and vegetation morphology.GEOCARTO INTERNATIONAL,29(8),860-877.
MLA Mishra, Niti B.,et al."Estimating fractional land cover in semi-arid central Kalahari: the impact of mapping method (spectral unmixing vs. object-based image analysis) and vegetation morphology".GEOCARTO INTERNATIONAL 29.8(2014):860-877.
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