Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.icarus.2013.04.017 |
Modeling the SAR backscatter of linear dunes on Earth and Titan | |
Paillou, Ph.1; Bernard, D.1; Radebaugh, J.2; Lorenz, R.3; Le Gall, A.4; Farr, T.5 | |
通讯作者 | Paillou, Ph. |
会议名称 | 3rd International Planetary Dunes Workshop |
会议日期 | JUN 12-15, 2012 |
会议地点 | Flagstaff, AZ |
英文摘要 | We modeled the Synthetic Aperture Radar (SAR) response of linear dunes of the Great Sand Sea in Egypt using a single surface scattering term, based on Integral Equation and Physical Optics Models. Using multi-frequency SIR-C/X-SAR radar scenes and topography obtained from the Shuttle Radar Topography Mission (SRTM), we were able to estimate reasonable values for the parameters describing the surface roughness of the dunes. As the linear dunes of the Great Sand Sea are relevant analogs for the linear dunes observed on Titan by the Cassini Radar instrument, these results were thus used as a starting point to simulate the radar response of Titan's dunes, as imaged by the Radar instrument onboard the Cassini spacecraft during the T8 flyby in October 2005. We show that a single surface scattering term is not sufficient to simulate the radar signal backscattered by the dunes on Titan: one has to add a diffuse scattering term, indicating that Titan's dunes are likely to have somewhat inhomogeneous internal structures related to porosity and/or internal layering. Our results also indicate that the dunes on Titan should be close to perfectly smooth, possibly because of the formation of smaller ripples than on Earth, plus smoothing resulting from precipitation events. (C) 2013 Elsevier Inc. All rights reserved. |
英文关键词 | Titan Titan surface Radar observations Earth |
来源出版物 | ICARUS |
ISSN | 0019-1035 |
EISSN | 1090-2643 |
出版年 | 2014 |
卷号 | 230 |
页码 | 208-214 |
出版者 | ACADEMIC PRESS INC ELSEVIER SCIENCE |
类型 | Article;Proceedings Paper |
语种 | 英语 |
国家 | France;USA |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:000330333100018 |
WOS关键词 | CASSINI RADAR ; IMAGING RADAR ; SAND DUNES ; SURFACE ; SPACEBORNE ; SCATTEROMETRY ; DESERT ; SAHARA ; IMAGES ; MAPPER |
WOS类目 | Astronomy & Astrophysics |
WOS研究方向 | Astronomy & Astrophysics |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/302673 |
作者单位 | 1.Univ Bordeaux, UMR 5804, LAB, F-33270 Floirac, France; 2.Brigham Young Univ, Dept Geol Sci, Provo, UT 84602 USA; 3.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA; 4.Univ Versailles, LATMOS, F-78280 Guyancourt, France; 5.CALTECH, Jet Prop Lab, Div Earth & Space Sci, Pasadena, CA 91109 USA |
推荐引用方式 GB/T 7714 | Paillou, Ph.,Bernard, D.,Radebaugh, J.,et al. Modeling the SAR backscatter of linear dunes on Earth and Titan[C]:ACADEMIC PRESS INC ELSEVIER SCIENCE,2014:208-214. |
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