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The geometric correction of SAR imagery for the analysis of lineaments

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The geometric correction of SAR images is required for many applications that entail the merging of SAR images with other data sources. One example of such applications is the mapping of geological features from SAR images. An accurate model-based geometric correction is computer and labour intensive. When a large number of images are used, this task can be prohibitive and it is then quicker to use an empirical method. This approach has been compared to the model approach and the reported results are conflicting. In some studies it has been argued that the empirical method can produce accurate geocorrection in areas of limited relief. In other studies, however, the positional accuracy using that method has been found to be unacceptable. In this Letter it is argued that in some applications, positional accuracy may not be of utmost importance and that more relevant measures such as the accuracy of orientation should be used. A geometrical method is designed to investigate the bias in orientation when an empirical method is used.
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Document Type: Research Article

Affiliations: Swedish University of Agricultural Sciences Department of Forest Resourse Management and Geomatics, Section of Remote Sensing Laboratory, Umea, Sweden, SE 901 83

Publication date: 2000-11-10

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