Mapping dynamic cover types in a large seasonally flooded wetland using extended principal component analysis and object-based classification

	Mapping dynamic cover types in a large seasonally flooded wetland using extended principal component analysis and object-based classification
	Dronova, Iryna 1; Gong, Peng 1; Wang, Lin 1; Zhong, Liheng 1
刊名	REMOTE SENSING OF ENVIRONMENT
	2015
卷号	158 页码:270-283
关键词	Dynamic cover types Wetland remote sensing Object-based image analysis PR China Extended PCA Phenology Change trajectory analysis
通讯作者	Dronova, I (reprint author), Univ Calif Berkeley, Dept Landscape Architecture & Environm Planning, Coll Environm Design, 202 Wurster Hall 2000, Berkeley, CA 94720 USA.
英文摘要	Periodically inundated wetlands with high short-term surface variation require special approaches to assess their composition and long-term change. To circumvent high uncertainty in single-date analyses of such areas, we propose to characterize them as dynamic cover types (DCTs), or sequences of wetland states and transitions informed by physically and ecologically plausible surface processes. This study delineated DCTs for one 2007-2008 flood cycle at Poyang Lake, the largest freshwater wetland in China, using spatial and temporal orientation modes of extended principal components analysis (EPCA) and supervised object-based classification of multi-spectral and radar image series. Classification accuracy was compared among three sets of attributes selected by machine-learning optimization from object-level mean and standard deviations of: 1) image time series alone; 2) the most informative EPCA outputs alone and 3) image time series and EPCA results together. Classification uncertainty was additionally assessed as low values of object's maximum class membership (<0.5). The highest accuracy was achieved with a larger set of 33 attributes selected from combined time series and EPCA results (overall accuracy 95.0%, kappa 0.94); however, accuracies with smaller sets of variables from input image series or EPCA results alone were comparably high (93.1% and 94.7%, respectively). All three selected attribute sets included standard deviations of image and/or EPCA values, suggesting the utility of object texture in dynamic class discrimination. The highest classification uncertainty was observed primarily along the mapped class boundaries, in some cases indicating minor change trajectories for which prior reference data were not available. Results indicate that DCTs provide a reasonable classification framework for complex and variable Poyang Lake wetlands that can be facilitated by EPCA transformation of complementary remote sensing time series. Future work should test this approach over multiple change cycles and assess sensitivity of results to temporal frequency of input image series, alternative variable selection algorithms and other remote sensors. (C) 2014 Elsevier Inc All rights reserved.
研究领域[WOS]	Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000348879100015
内容类型	期刊论文
源URL	[http://ir.ceode.ac.cn/handle/183411/38479]
专题	遥感与数字地球研究所_SCI/EI期刊论文_期刊论文
作者单位	1.[Dronova, Iryna] Univ Calif Berkeley, Dept Landscape Architecture & Environm Planning, Coll Environm Design, Berkeley, CA 94720 USA 2.[Dronova, Iryna 3.Gong, Peng 4.Zhong, Liheng] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Div Ecosyst Sci, Coll Nat Resources, Berkeley, CA 94720 USA 5.[Gong, Peng 6.Wang, Lin] Chinese Acad Sci, Inst Remote Sensing Applicat, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China 7.[Gong, Peng 8.Wang, Lin] Beijing Normal Univ, Beijing 100101, Peoples R China 9.[Gong, Peng 10.Wang, Lin] Tsinghua Univ, Ctr Earth Syst Sci, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Dronova, Iryna,Gong, Peng,Wang, Lin,et al. Mapping dynamic cover types in a large seasonally flooded wetland using extended principal component analysis and object-based classification[J]. REMOTE SENSING OF ENVIRONMENT,2015,158:270-283.
APA	Dronova, Iryna,Gong, Peng,Wang, Lin,&Zhong, Liheng.(2015).Mapping dynamic cover types in a large seasonally flooded wetland using extended principal component analysis and object-based classification.REMOTE SENSING OF ENVIRONMENT,158,270-283.
MLA	Dronova, Iryna,et al."Mapping dynamic cover types in a large seasonally flooded wetland using extended principal component analysis and object-based classification".REMOTE SENSING OF ENVIRONMENT 158(2015):270-283.