Evaluation of MODIS LAI/FPAR Product Collection 6. Part 1: Consistency   and Improvements

doi:10.3390/rs8050359

CORC > 北京大学 > 地球与空间科学学院

	Evaluation of MODIS LAI/FPAR Product Collection 6. Part 1: Consistency and Improvements
	Yan, Kai ; Park, Taejin ; Yan, Guangjian ; Chen, Chi ; Yang, Bin ; Liu, Zhao ; Nemani, Ramakrishna R. ; Knyazikhin, Yuri ; Myneni, Ranga B.
刊名	REMOTE SENSING
	2016
关键词	Leaf Area Index (LAI) Fraction of Photo-synthetically Active Radiation (FPAR) MODIS Collection 6 evaluation consistency LEAF-AREA INDEX PHOTOSYNTHETICALLY ACTIVE RADIATION SYSTEM DATA RECORD ABSORBED PAR FRACTION VALIDATION ALGORITHM UNCERTAINTIES RETRIEVALS RESOLUTION
DOI	10.3390/rs8050359
英文摘要	As the latest version of Moderate Resolution Imaging Spectroradiometer (MODIS) Leaf Area Index (LAI) and Fraction of Photosynthetically Active Radiation (FPAR) products, Collection 6 (C6) has been distributed since August 2015. This collection is evaluated in this two-part series with the goal of assessing product accuracy, uncertainty and consistency with the previous version. In this first paper, we compare C6 (MOD15A2H) with Collection 5 (C5) to check for consistency and discuss the scale effects associated with changing spatial resolution between the two collections and benefits from improvements to algorithm inputs. Compared with C5, C6 benefits from two improved inputs: (1) L2G-lite surface reflectance at 500 m resolution in place of reflectance at 1 km resolution; and (2) new multi-year land-cover product at 500 m resolution in place of the 1 km static land-cover product. Global and seasonal comparison between C5 and C6 indicates good continuity and consistency for all biome types. Moreover, inter-annual LAI anomalies at the regional scale from C5 and C6 agree well. The proportion of main radiative transfer algorithm retrievals in C6 increased slightly in most biome types, notably including a 17% improvement in evergreen broadleaf forests. With same biome input, the mean RMSE of LAI and FPAR between C5 and C6 at global scale are 0.29 and 0.091, respectively, but biome type disagreement worsens the consistency (LAI: 0.39, FPAR: 0.102). By quantifying the impact of input changes, we find that the improvements of both land-cover and reflectance products improve LAI/FPAR products. Moreover, we find that spatial scale effects due to a resolution change from 1 km to 500 m do not cause any significant differences.; MODIS program of NASA; National Basic Research Program of China [2013CB733402]; NSFC [41331171]; Chinese Scholarship Council; SCI(E); EI; ARTICLE; kaiyan.earthscience@gmail.com; taejin1392@gmail.com; gjyan@bnu.edu.cn; chenchi@bu.edu; ybjason@bu.edu; liuzhaofairy@gmail.com; rama.nemani@nasa.gov; jknjazi@bu.edu; ranga.myneni@gmail.com; 5; 8
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438046]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Yan, Kai,Park, Taejin,Yan, Guangjian,et al. Evaluation of MODIS LAI/FPAR Product Collection 6. Part 1: Consistency and Improvements[J]. REMOTE SENSING,2016.
APA	Yan, Kai.,Park, Taejin.,Yan, Guangjian.,Chen, Chi.,Yang, Bin.,...&Myneni, Ranga B..(2016).Evaluation of MODIS LAI/FPAR Product Collection 6. Part 1: Consistency and Improvements.REMOTE SENSING.
MLA	Yan, Kai,et al."Evaluation of MODIS LAI/FPAR Product Collection 6. Part 1: Consistency and Improvements".REMOTE SENSING (2016).