InSAR – Interferometric Synthetic Aperture Radar

InSAR uses two or more SAR (Synthetic Aperture Radar) images of the same area taken at different times to measure ground surface deformation or elevation change. It tracks phase differences (fractions of radar wavelength) between the images, yielding maps of displacement (e.g. uplift, subsidence) with spatially dense coverage. Accuracy can reach millimeters to centimeters depending on time interval, radar wavelength, and processing. Applications include earthquake deformation, volcanic activity, landslides, infrastructure stability, subsidence due to groundwater extraction, ice‐sheet dynamics.

More Info: https://geodesy.science/ggos/obs/