Interferometric Synthetic Aperture Radar (InSAR) is a remote sensing technique used to create high-resolution images of the Earth's surface and to measure ground deformation. It combines the principles of synthetic aperture radar (SAR) and interferometry to gain detailed insights into topography, land subsidence, tectonic activity, and other geological processes.
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Comparison of coherent radar phases from repeated observations to infer relative line-of-sight displacement. A complete deformation fringe represents half a radar wavelength after other phase contributions have been removed.