1. Method for identifying persistent scatterers in digital Synthetic Aperture Radar (SAR) images of an area of Earth's surface each taken at a respective time; the method comprising: processing the digital Synthetic Aperture Radar (SAR) images to produce digital generalized differential interferograms; the method being characterized by further comprising: analyzing properties of pairs of pixels in the digital generalized differential interferograms to identify individual pixels imaging persistent scatterers.