气候变化领域集成服务门户(CCPortal): The Discrepancy Between Backscattering Model Simulations and Radar Observations Caused by Scaling Issues: An Uncertainty Analysis

CCPortal

DOI	10.1109/TGRS.2019.2899120
	The Discrepancy Between Backscattering Model Simulations and Radar Observations Caused by Scaling Issues: An Uncertainty Analysis
	Ma, Chunfeng; Li, Xin; Chen, Kun-Shan
通讯作者	Li, X (通讯作者)
发表日期	2019
ISSN	0196-2892
EISSN	1558-0644
起始页码	5356
结束页码	5372
卷号	57 期号:8
英文摘要	Microwave backscattering models play key roles in surface scattering modeling and soil moisture inversion in active microwave remote sensing. However, numerous evaluations indicate that significant discrepancies between the model simulations and radar observations remain, and these discrepancies are regarded to be attributed to inaccuracies in the models. What do such discrepancies originate from is unclear and has not been comprehensively analyzed. To this end, this paper presents an uncertainty analysis to explore the intrinsic reason for the discrepancies between the backscattering model simulations and radar observations. The probability distribution function and the corresponding statistical characteristics are introduced to describe the uncertainty in the model outputs. We find that the scale dependence of the key model inputs leads to significant uncertainties in the model inputs, and the uncertainties are transferred into the model outputs. Thus, the discrepancies between the model simulations and radar observations are intrinsically caused by the spatial scaling and related uncertainties of key model inputs. In short, the scale mismatch between the model inputs and remote sensing pixels is an intrinsic factor that causes the discrepancies between the model simulations and radar observations. This finding suggests that the scaling effect of model inputs should be carefully considered when using the backscattering models at the pixel scale, and equivalent inputs matched at the corresponding scales should be developed for remote sensing applications. Thus, this analysis insights into the scale dependence of inputs for backscattering models and suggests to provide scale-matched inputs where the models are applied at different scales.
关键词	SURFACE SOIL-MOISTURE INTEGRAL-EQUATION MODEL L-BAND SEMIEMPIRICAL CALIBRATION IEM MODEL C-BAND BISTATIC SCATTERING SAR DATA ROUGHNESS DUBOIS
英文关键词	Backscattering model; heterogeneity; microwave remote sensing; scaling effect; uncertainty
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Engineering ; Remote Sensing ; Imaging Science & Photographic Technology
WOS类目	Geochemistry & Geophysics ; Engineering, Electrical & Electronic ; Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号	WOS:000476805800011
来源期刊	IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259449
推荐引用方式 GB/T 7714	Ma, Chunfeng,Li, Xin,Chen, Kun-Shan. The Discrepancy Between Backscattering Model Simulations and Radar Observations Caused by Scaling Issues: An Uncertainty Analysis[J]. 中国科学院青藏高原研究所,2019,57(8).
APA	Ma, Chunfeng,Li, Xin,&Chen, Kun-Shan.(2019).The Discrepancy Between Backscattering Model Simulations and Radar Observations Caused by Scaling Issues: An Uncertainty Analysis.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,57(8).
MLA	Ma, Chunfeng,et al."The Discrepancy Between Backscattering Model Simulations and Radar Observations Caused by Scaling Issues: An Uncertainty Analysis".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 57.8(2019).