Repeat-pass satellite synthetic aperture radar interferometry (IFSAR) is a very effective technique for terrain and structure displacement mapping applied to structural degradation, subsidence, landslides, earthquakes and volcanic phenomena monitoring. IFSAR technique measures terrain displacements with millimetre accuracy, processing data acquired from satellites orbiting over 500 kilometres above the Earth, equipped with SAR sensors.
The picture below shows exemplary recognizable topographic signatures, an urban area on top left, and a water body in the middle.
The following pictures show output examples from SAR data processing (left: World Trade Center Beijing (China), right: Piana degli Albanesi Dams, Sicily (Italy))
