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Multifrequency and multipolarization radar scatterometry of sand dunes and comparison with spaceborne and airborne radar images

Blom, Ronald and Elachi, Charles (1987) Multifrequency and multipolarization radar scatterometry of sand dunes and comparison with spaceborne and airborne radar images. Journal of Geophysical Research B, 92 (B8). pp. 7877-7889. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20151104-111025743

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Abstract

Understanding the unusual radar scattering characteristics of sand dunes is necessary in the analysis of radar images of aeolian landscapes of the earth and of other planets. In this paper we report on airborne radar scatterometer data of sand dunes, acquired at multiple frequencies and polarizations. Radar backscatter from sand dunes is very sensitive to the imaging geometry. At small incidence angles the radar return is mainly due to quasi-specular reflection from dune slopes favorably oriented toward the radar. A peak return usually occurs at the incidence angle equal to the angle of respose for the dunes. The peak angle is the same at all frequencies as computed from specular reflection theory. At larger angles the return is significantly weaker. The scatterometer measurements verified observations made with airborne and spaceborne radar images acquired over a number of dune fields in the United States, central Africa, and the Arabian peninsula. The imaging geometry constraints indicate that possible dunes on other planets, such as Venus, will probably not be detected in radar images unless the incidence angle is less than the angle of repose of such dunes and the radar look direction is approximately orthogonal to the dune trends.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/JB092iB08p07877 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/JB092iB08p07877/abstractPublisherArticle
Additional Information:© 1987 by the American Geophysical Union. Paper number 6B5916. Received January 2, 1986; revised November 18, 1986; accepted January 29, 1987. The authors wish to thank Carol Breed, Pamela Cooley, Tim Dixon, Floyd Sabins, and Ray Sugiura for discussions and help in the field. Ann Sheehan helped with the data reduction, and Sue Salas helped with the graphics. The Earth Resources Branch of the Johnson Space Center acquired the scatterometer and X band data. Manouher Naraghi of the Image Processing Laboratory at the Jet Propulsion Laboratory provided computing assistance. This manuscript was much improved by reviews by Peter Ford and Ronald Greeley. This research was performed at the Jet Propulsion Laboratory of the California Institute of Technology and sponsored by the National Aeronautics and Space Administration.
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Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Issue or Number:B8
Record Number:CaltechAUTHORS:20151104-111025743
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151104-111025743
Official Citation:Blom, R., and C. Elachi (1987), Multifrequency and multipolarization radar scatterometry of sand dunes and comparison with spaceborne and airborne radar images, J. Geophys. Res., 92(B8), 7877–7889, doi:10.1029/JB092iB08p07877
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61819
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Nov 2015 19:15
Last Modified:03 Oct 2019 09:12

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