GCP selection in mountainous relief is a difficult process. This paper shows methods using topographic, SAR and visible image data to define ridge points as GCPs. The SAR layover and shadow boundaries method is the best method but it depends of the back and fore slopes versus the look angle. Using SPOT ortho-images the results depend mainly on the visibility of the feature between the SAR and visible images. Simulated SAR is not a good solution since the DEM induces too large planimetric errors.
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机译：山区浮雕中的GCP选择是一个艰难的过程。本文显示了使用地形，SAR和可见图像数据的方法将脊点定义为GCP。 SAR LICAVER和SHIBID边界方法是最好的方法，但它取决于后斜坡与看起来的角度。使用点Ortho-Images，结果主要取决于SAR和可见图像之间的特征的可见性。由于DEM引起太大的平面误差，模拟SAR不是一个好的解决方案。
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