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Terrain influences in SAR backscatter and attempts to their correction

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3 Author(s)
T. Bayer ; German Aerosp. Res. Establ., Oberpfaffenhofen, Germany ; R. Winter ; G. Schreier

Synthetic aperture radar (SAR) images reveal radiometric image distortions that are caused by terrain undulations. The authors present the results of a study extracting and investigating the various components of these terrain influences. An imaging model, is set up for the geometric rectification of the SAR image and for a reconstruction of the imaging geometry. A prerequisite for the setup of this model is the use of a digital elevation model. Eight different geometric parameters are derived and investigated for their influence on grey-value variations in the geocoded SAR image. Image grey-value variations of three major land-use classes-forest, agricultural land, and urban/suburban areas-are examined. Empirical models of the SAR-backscatter variations are used to describe the relations between image grey values and various geometric parameters

Published in:

IEEE Transactions on Geoscience and Remote Sensing  (Volume:29 ,  Issue: 3 )