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Potential and limitations of differential SAR interferometry for the periodical survey of Alpine displacements are investigated. For the Alpine territory, which is characterized by low vegetation, C-band differential SAR interferometry shows a relatively high coherence during the snow-free season permitting the detection and monitoring of unstable slopes on a regular basis. Limitations to the spatial coverage arise from decorrelation over forested and snow covered areas and from layover and shadowing caused by the very rugged topography. Significant results in the Swiss Alps using ERS-1/2 SAR data are used as support to our investigations.