Temporal Validation of Four LAI Products over Grasslands in the Northeastern Tibetan Plateau

doi:10.14358/PERS.86.4.225

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所

	Temporal Validation of Four LAI Products over Grasslands in the Northeastern Tibetan Plateau
	Yin Gaofei 1; Li Ainong 2; Zhang Zhengjian 2; Lei Guangbin 2
刊名	PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING
	2020
卷号	86 期号:4 页码:225-233
ISSN号	0099-1112
DOI	10.14358/PERS.86.4.225
产权排序	2
文献子类	Article
英文摘要	Time series of leaf area index (LAI) products are now widely used, and the temporal validation is the prerequisite for their proper application. However, a systematical comparison between different products using both direct and indirect methods is still lacking. The objective of this paper is to assess and compare the temporal performances of four LAI products: Moderate Resolution Imaging Spectromdiometer (MODIS) LAI (MOD)15A2, MOD15A2h, Geoland2 Version 1 (GEOvi), and Global Land Surface Satellite (cLAss). The study area, which is dominated by gmsslands, is located in the northeastern Tibetan Plateau (Ti), and temperature is the main stress factor affecting grass growth. Both a correlation analysis with temperature and a direct comparison with temporally continuous LAI reference maps were implemented in our temporal validation experiments. The results show that no single product can capture the rapid change and the seasonal trend in LAI simultaneously, and the compositing period used in each product determines the quality of the corresponding LAI time series. The MOD15A2 and MOD15A2h products, which have short compositing windows (eight days), are suitable for detecting rapid change. A grazinginduced biomass decrease that occurred around day of year 205 in 2014 in our study area was clearly revealed in these two products. For the GEOV1 and GLASS products, which have compositing windows of 30 days and 1 year, respectively, the grazing date was shifted (GEovr) or even invisible (0ms.9). However, products with prolonged compositing windows may be more robust to observation noise, and the resulting products may be suitable for capturing the seasonal trend. This study highlights that the concurrent use of data from various sensors onboard different satellites, and the introduction of new generations of satellites (e.g., Gaofen-6), are two promising ways to further improve existing LAI time series.
电子版国际标准刊号	2374-8079
语种	英语
WOS记录号	WOS:000599524200005
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/55050]
专题	中国科学院水利部成都山地灾害与环境研究所
通讯作者	Yin Gaofei; Li Ainong
作者单位	1.Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu 610031, Peoples R China; 2.Chinese Acad Sci, Res Ctr Digital Mt & Remote Sensing Applicat, Inst Mt Hazards & Environm, Chengdu 610010, Peoples R China
推荐引用方式 GB/T 7714	Yin Gaofei,Li Ainong,Zhang Zhengjian,et al. Temporal Validation of Four LAI Products over Grasslands in the Northeastern Tibetan Plateau[J]. PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING,2020,86(4):225-233.
APA	Yin Gaofei,Li Ainong,Zhang Zhengjian,&Lei Guangbin.(2020).Temporal Validation of Four LAI Products over Grasslands in the Northeastern Tibetan Plateau.PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING,86(4),225-233.
MLA	Yin Gaofei,et al."Temporal Validation of Four LAI Products over Grasslands in the Northeastern Tibetan Plateau".PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING 86.4(2020):225-233.