Abstract
Abstract ERS-1 Synthetic Aperture Radar geocoded images (SAR.GEC) are supposed to be accurate to within 150 m. Nevertheless, errors of more than 1000 m (especially in the longitudinal direction) have been discovered. The errors are due to the geometric processing routine, which has shortcomings in mountainous and/or coastal areas: the geoid height in the centre pixel of the image is used as a mean geoid height for the whole 100 × 100 km2 image. This means that sea areas and land areas cannot have correct coordinates at the same time.
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