CCPortal
DOI10.1016/j.jaridenv.2008.02.012
Impacts and uncertainties of upscaling of remote-sensing data validation for a semi-arid woodland
Hufkens, K.; Bogaert, J.; Dong, Q. H.; Lu, L.; Huang, C. L.; Ma, M. G.; Che, T.; Li, X.; Veroustraete, F.; Ceulemans, R.
发表日期2008
ISSN0140-1963
起始页码1490
结束页码1505
卷号72期号:8
英文摘要Over the last decade, remote-sensing products found their use in numerous public applications and scientific research. Frequent validation of remote-sensing products is necessary to ensure the quality and accuracy. An important step in this process is the upscaling from field measurements of leaf area index (LAI) or other biogeophysical variables to the scale of a high-resolution satellite image. Unlike other vegetation types, semi-arid woodlands are often characterized by a distinct vegetation pattern, a low vegetation cover and site variations in bare soil reflectance which influence the upscaling process. This paper focuses on the upscaling of LAI field measurements of a semi-arid woodland in northwest China and the uncertainties associated with it. The LAI measurements were scaled up using two different approaches. The first upscaling method uses an ordinary average of the LAI measurements. The alternative method uses an area-based weighted average. The vegetation characteristics showed abundant small vegetation patches which were not accurately reflected in the systematic LAI field measurements. Therefore, the alternative method which reflected the vegetation structure more accurately needs to be considered. We conclude that an area-weighted average based on the fractional green vegetation cover is to be preferred over a simple average. If possible destructive sampling of the LAI is be preferred over indirect LAI measurements to reduce the errors associated with vegetation clumping and the presence of abundant non-green biomass. (c) 2008 Elsevier Ltd. All rights reserved.
英文关键词area-weighted average; LAI; northwest China; VALERI protocol
WOS研究方向Environmental Sciences & Ecology
WOS类目Ecology ; Environmental Sciences
WOS关键词LEAF-AREA INDEX ; LAND-ATMOSPHERE INTERACTIONS ; VEGETATION DYNAMICS ; ARID ECOSYSTEMS ; FOREST SITE ; NDVI ; PRODUCTS ; LAI ; ALGORITHM ; PATTERNS
WOS记录号WOS:000257459500008
来源期刊JOURNAL OF ARID ENVIRONMENTS
来源机构中国科学院西北生态环境资源研究院
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/241045
作者单位[Hufkens, K.; Ceulemans, R.] Univ Antwerp, Dept Biol, B-2610 Antwerp, Belgium; [Bogaert, J.] Univ Libre Bruxelles, Lab Ecol Paysage, Ecole Interfac Bioingenieurs, B-1050 Brussels, Belgium; [Dong, Q. H.; Veroustraete, F.] Flemish Inst Technol Res VITO, B-2400 Mol, Belgium; [Lu, L.; Huang, C. L.; Ma, M. G.; Che, T.; Li, X.] Chinese Acad Sci, CAREERI, Lanzhou 730000, Peoples R China
推荐引用方式
GB/T 7714
Hufkens, K.,Bogaert, J.,Dong, Q. H.,et al. Impacts and uncertainties of upscaling of remote-sensing data validation for a semi-arid woodland[J]. 中国科学院西北生态环境资源研究院,2008,72(8).
APA Hufkens, K..,Bogaert, J..,Dong, Q. H..,Lu, L..,Huang, C. L..,...&Ceulemans, R..(2008).Impacts and uncertainties of upscaling of remote-sensing data validation for a semi-arid woodland.JOURNAL OF ARID ENVIRONMENTS,72(8).
MLA Hufkens, K.,et al."Impacts and uncertainties of upscaling of remote-sensing data validation for a semi-arid woodland".JOURNAL OF ARID ENVIRONMENTS 72.8(2008).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Hufkens, K.]的文章
[Bogaert, J.]的文章
[Dong, Q. H.]的文章
百度学术
百度学术中相似的文章
[Hufkens, K.]的文章
[Bogaert, J.]的文章
[Dong, Q. H.]的文章
必应学术
必应学术中相似的文章
[Hufkens, K.]的文章
[Bogaert, J.]的文章
[Dong, Q. H.]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。