TERRAIN INFLUENCES IN SAR BACKSCATTER AND ATTEMPTS TO THEIR CORRECTION

被引:54
作者
BAYER, T [1 ]
WINTER, R [1 ]
SCHREIER, G [1 ]
机构
[1] DLR,GERMAN AEROSP RES ESTAB,GERMAN REMOTE SENSING DATA CTR,W-8031 OBERPFAFFENHOFEN,GERMANY
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 1991年 / 29卷 / 03期
关键词
SAR GEOCODING; SAR POST-PROCESSING; SLOPE ASPECT EFFECTS; RADIOMETRIC IMAGE CORRECTIONS;
D O I
10.1109/36.79436
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Synthetic aperture radar images reveal radiometric image distortions that are caused by terrain undulations. This paper presents 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 necessary 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. The models are used for a numerical estimation of the terrain influence on the backscatter variations in the SAR image. Furthermore, the models allow the derivation of 13 different functions for the correction of the relief-induced radiometric image distortions. These functions are applied to test areas within the SAR scene under investigation and their correction effects are described and compared numerically as well as visually.
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页码:451 / 462
页数:12
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