Spatial and Temporal Behavior of Microwave Backscatter Directional Modulation Over the Saharan Ergs

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Permanent URL	http://hdl.lib.byu.edu/1877/1114
Title	Spatial and Temporal Behavior of Microwave Backscatter Directional Modulation Over the Saharan Ergs
BYU Creator	Long, David G.
Creator	Stephen, Haroon
Keywords	Desert; European Centre for Medium-Range Weather Forecasts (ECMWF); European RemoteSensing Satellite Scatterometer (ESCAT); NASA Scatterometer (NSCAT); SeaWinds Scatterometer; dunes; ergs; winds;
Description/Abstract	Radar backscatter (σ˚) from ergs is modulated with view direction [incidence (θ) and azimuth (φ) angles], where the modulation characteristics reflect the surface geometry. σ˚ also varies spatially and reflects the spatial inhomogeneity of the sand surface. We use σ˚ measurements at different θ and φ angles from the NASA, European Remote Sensing satellite, and SeaWinds scatterometers to understand the relationship between wind and erg bedforms. A model incorporating the σ˚ φ-modulation and spatial inhomogeneity is proposed. Surface slope variations are related to the σ˚ spatial inhomogeneity. We compare the backscatter model results with numerically predicted wind direction data provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) over the erg surfaces. We use the maxima of the φ-modulation at θ=33˚ to infer the orientation of the dominant slip-sides on the sand surface. These orientations are consistent with the ECMWF wind directions spatially and temporally.
Source	Stephen, H., and D. G. Long. "Spatial and Temporal Behavior of Microwave Backscatter Directional Modulation Over the Saharan Ergs." Geoscience and Remote Sensing, IEEE Transactions on 45.5 (2007): 1164-73;
Publisher	IEEE
Date Original	2007-05
Language	English eng en
Publication Type	Peer-Reviewed Articles
Type	Text
Format	application/pdf
Owning Institution	Brigham Young University
BYU College	Ira A. Fulton College of Engineering and Technology
BYU Department	Electrical and Computer Engineering
Copyright Status	(c) 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.;
Copyright Use Information	http://www.lib.byu.edu/generic_copyright.html

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Spatial and Temporal Behavior of Microwave Backscatter Directional Modulation Over the Saharan Ergs

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