Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1109/TGRS.2004.840646 |
Microwave backscatter modeling of Erg surfaces in the Sahara desert | |
Stephen, H; Long, DG | |
通讯作者 | Stephen, H |
来源期刊 | IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
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ISSN | 0196-2892 |
EISSN | 1558-0644 |
出版年 | 2005 |
卷号 | 43期号:2页码:238-247 |
英文摘要 | The Sahara desert includes large expanses of sand dunes called ergs. These dunes are formed and constantly reshaped by prevailing winds. Previous study shows that Saharan ergs exhibit significant radar backscatter (sigmadegrees) modulation with azimuth angle (phi). We use alphadegrees measurements observed at various incidence angles and phi from the NASA Scatterometer (NSCAT), the SeaWinds scatterometer, the ERS scatterometer (ESCAT), and the Tropical Rainfall Measuring Mission’s Precipitation Radar to model the sigmadegrees response from sand dunes. Observations reveal a characteristic relationship between the backscatter modulation and the dune type, i.e., the number and orientation of the dune slopes. Sand dunes are modeled as a composite of tilted rough facets, which are characterized by a probability distribution of tilt with a mean value, and small ripples on the facet surface. The small ripples are modeled as cosinusoidal surface waves that contribute to the return signal at Bragg angles only. Longitudinal and transverse dunes are modeled with rough facets having Gaussian tilt distributions. The model results in a sigmadegrees response similar to NSCAT and ESCAT observations over areas of known dune types in the Sahara. The response is high at look angles equal to the mean tilts of the rough facets and is lower elsewhere. This analysis provides a unique insight into scattering by large-scale sand bedforms. |
英文关键词 | backscatter Erg ERS Scatterometer (ESCAT) NASA Scatterometer (NSCAT) sand dune sand sheet Sea Winds scatterometer (QSCAT) Tropical Rainfall Measuring Mission Precipitation Radar (TRMM-PR) |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000226502100004 |
WOS关键词 | SCATTEROMETER DATA ; SEA-ICE ; SATELLITE |
WOS类目 | Geochemistry & Geophysics ; Engineering, Electrical & Electronic ; Remote Sensing ; Imaging Science & Photographic Technology |
WOS研究方向 | Geochemistry & Geophysics ; Engineering ; Remote Sensing ; Imaging Science & Photographic Technology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/149256 |
作者单位 | (1)Brigham Young Univ, Ctr Earth Remote Sensing, Provo, UT 84602 USA |
推荐引用方式 GB/T 7714 | Stephen, H,Long, DG. Microwave backscatter modeling of Erg surfaces in the Sahara desert[J],2005,43(2):238-247. |
APA | Stephen, H,&Long, DG.(2005).Microwave backscatter modeling of Erg surfaces in the Sahara desert.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,43(2),238-247. |
MLA | Stephen, H,et al."Microwave backscatter modeling of Erg surfaces in the Sahara desert".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 43.2(2005):238-247. |
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