DOI: 10.1109/TGRS.2019.2954771
论文题名: Explaining Anomalies in SAR and Scatterometer Soil Moisture Retrievals from Dry Soils with Subsurface Scattering
作者: Morrison K. ; Wagner W.
刊名: IEEE Transactions on Geoscience and Remote Sensing
ISSN: 1962892
出版年: 2020
卷: 58, 期: 3 语种: 英语
英文关键词: Radar
; radar imaging
; soil moisture anomalies
; subsurface scattering
; synthetic aperture radar
Scopus关键词: Backscattering
; Meteorological instruments
; Polarization
; Radar
; Radar imaging
; Soil moisture
; Synthetic aperture radar
; Cross-polarized
; High resolution
; Incidence angles
; Laboratory investigations
; Relative strength
; Soil moisture retrievals
; Subsurface features
; Subsurface scattering
; Surface scattering
; anomaly
; polarization
; radar imagery
; sandy soil
; satellite imagery
; scatterometer
; soil moisture
; synthetic aperture radar
; tomography
英文摘要: This article presents the results of a laboratory investigation to explain anomalously high soil moisture estimates observed in retrievals from SAR and scatterometer backscatter, affecting extensive areas of the world associated with arid climates. High-resolution C-band tomographic profiling was applied in experiments to understand the mechanisms underlying these anomalous retrievals. The imagery captured unique high-resolution profiles of the variations in the vertical backscattering patterns through a sandy soil with moisture change. The relative strengths of the surface and subsurface returns were dependent upon both soil moisture and soil structure, incidence-angle, and polarization. Copolarized returns could be dominated by both surface and subsurface returns at times, whereas crosspolarized returns were strongly associated with subsurface features. The work confirms suspicions that anomalous moisture estimates can arise from the presence of subsurface features. Diversity in polarization and incidence angle may provide sufficient diagnostics to flag and correct these erroneous estimates, allowing their incorporation into global soil moisture products. © 1980-2012 IEEE. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159107
Appears in Collections: 气候变化与战略
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作者单位: Department of Meteorology, University of Reading, Reading, RG6 6BB, United Kingdom; Department of Geodesy and Geoinformation, TU Wien, Vienna, 1040, Austria
Recommended Citation:
Morrison K.,Wagner W.. Explaining Anomalies in SAR and Scatterometer Soil Moisture Retrievals from Dry Soils with Subsurface Scattering[J]. IEEE Transactions on Geoscience and Remote Sensing,2020-01-01,58(3)