Fundamentals of radar imaging, synthetic aperture radar (SAR), interferometric synthetic aperture radar (InSAR), InSAR decorrelation, differential InSAR, unwrapping, InSAR error analysis, atmospheric signals, ionospheric disturbances, time‐series derivation and analysis, Small‐baseline subset (SBAS) InSAR, persistent scatterer InSAR, SAR image offsets, multiple‐aperture interferometry, crustal deformation mapping, InSAR applications, future InSAR missions.