Triangle Space-Based Surface Soil Moisture Estimation by the Synergistic Use of In Situ Measurements and Optical/Thermal Infrared Remote Sensing: An Alternative to Conventional Validations

doi:10.1109/TGRS.2018.2825284

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 > 数字山地与遥感应用中心

	Triangle Space-Based Surface Soil Moisture Estimation by the Synergistic Use of In Situ Measurements and Optical/Thermal Infrared Remote Sensing: An Alternative to Conventional Validations
	Zhao, Wei1 ; Sanchez, Nilda 2; Li, Ainong1
刊名	IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
	2018-08-01
卷号	56 期号:8 页码:4546-4558
关键词	Advanced Microwave Scanning Radiometer 2 (AMSR2) Landsat-8 REMEDHUS surface soil moisture (SSM) triangle space validation
ISSN号	0196-2892
DOI	10.1109/TGRS.2018.2825284
英文摘要	Together with the continuous development of passive microwave surface soil moisture (SSM) products from newly launched satellites, it is necessary to perform reliable validations to assess their accuracy. With this aim, a new "bottom-up" validation approach is proposed based on the synergistic use of in situ SSM measurements from the soil moisture measurement station network (REMEDHUS) of the University of Salamanca, Salamanca, Spain, and optical/thermal infrared observations over 18 cloud-free days from Landsat-8. An SSM estimation method using the boundary information from the land surface temperature and normalized difference vegetation index triangle space was developed for regional SSM mapping. The retrieved SSM reached a relatively good performance (mean R 2 and rootmean-squared error of 0.64 and 0.033 ne/m(3), respectively). Then, the regional SSM was aggregated into the grid-cell scale of the Advanced Microwave Scanning Radiometer 2 (AMSR2) L3 high-resolution (0.1 degrees /10 km) soil moisture product to validate it both at network and grid-cell levels. At the network level, the derived regional SSM showed a good agreement with the averaged in situ measurements over the network (R = 0.731). However, at the grid-cell level, small variations were observed for the cells over the network between the estimates and the AMSR2 product, with negative biases (-0.044 to -0.090 m(3)/m(3)) and positive correlations (R > 0.25) for most cells. In addition, it is shown that the descending product has a slightly better performance than does the ascending one. The preliminary assessments suggested that the proposed method provides new insights into the validation of passive microwave soil moisture products, while avoiding the common issue related to the big disparity in spatial scales between satellite observation and in situ measurements.
语种	英语
出版者	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
WOS记录号	WOS:000439980200020
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/23492]
专题	成都山地灾害与环境研究所_数字山地与遥感应用中心
通讯作者	Zhao, Wei
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China 2.Univ Salamanca, Ctr Hispanoluso Invet Agr, Villamayor 37185, Spain
推荐引用方式 GB/T 7714	Zhao, Wei,Sanchez, Nilda,Li, Ainong. Triangle Space-Based Surface Soil Moisture Estimation by the Synergistic Use of In Situ Measurements and Optical/Thermal Infrared Remote Sensing: An Alternative to Conventional Validations[J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,2018,56(8):4546-4558.
APA	Zhao, Wei,Sanchez, Nilda,&Li, Ainong.(2018).Triangle Space-Based Surface Soil Moisture Estimation by the Synergistic Use of In Situ Measurements and Optical/Thermal Infrared Remote Sensing: An Alternative to Conventional Validations.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,56(8),4546-4558.
MLA	Zhao, Wei,et al."Triangle Space-Based Surface Soil Moisture Estimation by the Synergistic Use of In Situ Measurements and Optical/Thermal Infrared Remote Sensing: An Alternative to Conventional Validations".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 56.8(2018):4546-4558.