Historicially, SAR to EO registration accuracy has been atthe multiple pixel level compared to sub-pixel EO to EO registration accuracies. This is due to a variety o f factors including the different scattering characteristics of the ground for EO and SAR, SAR speckle, and terrian induced geometric distortion. One approach to imp[roving the SAR to EO registration accuracy is to utilize the full information from multiple SAR surveys using interferometric techniques. In this paper we will examine this problem in detail with an example using ERS SAR imagery. Estimates of the resulting accuracy based on ERS are included.
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